Macro Obfuscation

It obfuscates the initial infection VBA macro code to avoid detection by anti-virus software. The first step in malware analysis is to take a look at the code itself. For instance, a macro that makes the player yell "Everybody, dance now!" and burst into dance would be written thus. new variants of user forms, modules, and objects) , as well as a significantly upgraded obfuscation scheme within the VBA macro code itself. When called, the macro is passed the following parameters:. ENABLE_PREPROCESSING = YES MACRO_EXPANSION = YES EXPAND_ONLY_PREDEF = YES PREDEFINED = __attribute__(x)= For a more complex example, suppose you have the following obfuscated code fragment of an abstract base class called IUnknown: /*! A reference to an IID */ #ifdef __cplusplus #define REFIID const IID & #else #define REFIID const IID * #endif /*!. The macros are always heavily obfuscated, with junk functions and string substitutions prevalent throughout the code. They are currently not part of the C++ programming language, though many recent C++ implementations support variable-argument macros as an extension (ie: GCC, MS Visual Studio C++), and it is. Abuse of function pointers; Code duplication by macros; Short coding; These led to the good obfuscation. Posts about docx written by Malwrologist. Sandboxes will return a short uptime. If business needs requires you to store sensitive data such as social security numbers, bank routing/account numbers, and so on, you should ensure the data is stored in a safe way. In addition, user macros allow strings with illegal characters (Such as ! and $) to be used in the Core Configuration Manager. pif is not an image format. Analyzing obfuscated VBA macros to extract C2 IP/URLs regardless of runtime behavior Introduction Lately, we have been seeing quite a lot of Office documents (or XML files with embedded Office documents, etc. There are several third-party and open-source tools that will obfuscate your code automatically. These macros. The point: no amount of "obfuscation" is going to help you in this situation. obfuscated macro that uses process-level environment variables and PowerShell's standard input command functionality to hide all meaningful command line arguments from winword. The first samples seen had an average length of 150 lines. Extract and prettify obfuscated JavaScript backdoor from userform object; 4. Obfuscating with retroguard actually speeds up the startup time since variable names are shorter and the resulting. While some people may argue that Clojure is already obfuscated by default, I think it is about time to organise an official International Obfuscated Clojure Coding Contest similar to the IOCCC. In Microsoft Office, macros are small helper programs written in Visual Basic for Applications (VBA). In Syntax Highlighting settings' panel there is a predefined highlighting mode for C/C++, but the predefined mode does not handle colors for functions, macro definitions and I failed to find the way to add them to the predefined list. So, to recap, when reversing obfuscated macros: Locate the entry point function; Identify the obfuscation used (junk code, functions, etc. Conviction in the view. Macros were used as an in-line text replacement mechanism that would replace several lines of assembly code, into a single macro line. The following image shows the decoding process. Diagrams of board positions in the games of Havannah and Hex. Macro Pack – Automatize Obfuscation and Generation of Malicious Office Documents. AMSI has no visibility into XLM macros (for now) Anti-virus struggles with XLM (for now) XLM macros can access the Win32 API (think virtualalloc and createthread). The team said that while the hundreds of unique Excel files in this campaign use "highly obfuscated formulas", all of them connect to the same URL to download the payload. Office as a malware delivery platform: DDE, Scriptlets, Macro obfuscation Powerful behind-the-scenes features in Office have suddenly stepped back into the malware limelight, with an onslaught of. It will make analyzing the program with this decompiler difficult and other decompilers will refuse to decompile this file at all. The Macro Stepper says that the use of our macro: (hyphen-define/wrong1. Hunt Stats: Office Macros 1/15 through 3/15 < 1000/day on average. Figure 5: After Obfuscation. Unlock the Power of Data. However, many macro-based attacks utilize. Figure 3: Extracted Macro. The file lecture00. C, C++ and Perl are most often cited as easily obfuscatable languages. Extract macros stored inside stream 3 in file. Assign a Macro. The following code replaces every letter (preserving existing letter casing though) in every cell containing a text constant with a random letter. A variadic macro is a feature of the preprocessor whereby a macro is declared to accept a varying number of arguments (similar to a variadic function). These obfuscation techniques easily evade sandboxing and other intrusion detection techniques due to Binary Fragmentation. Make sure "Macro-Enabled" is selected from the drop-down menu. The party who originally supplies the obfuscated program need not be online when the client wants to evaluate the program. PowerShell launched If we go and check the API monitor dashboard we can see that our Powershell code is visible under the API call GetCommandLineA and the module which calls. NigelShaw150. •AutoOpen, Document_Open, Document_Close, etc •They need to drop a payload as a file, or inject code into a process. enter int 2dh db 0c8h endm CLOAK4B macro ;int. exe -c^o^m^m^a^n^d -F^i^l^e “script. A new Module Folder and new module will be added in the pane on the left. Macro code is obfuscated to evade detection. Years ago, I heard a story that at one point there were two Stephen R. Figures 1 and 2: A side-by-side comparison of two randomly chosen macros. You may think of document macro viruses as a thing of the past. Contact me on Discord: gyuriX#8413. Assign a Macro. To execute the downloaded malware with high system privilege, it utilizes an already known UAC-bypass technique. But you ultimately need to supply the scripting engine with plain, un-obfuscated code. slk attachment that contains a malicious macro (msiexec script) to download and install a remote access trojan. exe's child process of cmd. The script also saves to disk the malicious OTM file (Outlook VBA project) that contains a macro, the malicious email attachment and, in some cases, a list of. Figure 3: Extracted Macro. User macros are helpful in specif. There are several third-party and open-source tools that will obfuscate your code automatically. If victims then open the malicious document and enable the macro, it will then install the PowerDuke backdoor [14]. This is true even if the script was generated at runtime. Therefore,we first describe this macro. The key is finding a way to get a shell and a delivery method that. A first round of obfuscation technique was adopted by the attacker in order to make harder the analyst’s decoding process. See full list on cobbr. * Really, Stephen R. ' Input(s) : value - The value to Obfuscate. 01/20 Introduction and overview. Some obfuscation technique These are some of the techniques used in Emotet PowerShell to obfuscate the code to make the analysis difficult. The macro is checking if a specific process is running (example outlook. The obfuscated script retrieves a PowerShell command which downloads DanaBot [4] to the %TEMP% folder and executes it. Hunt Stats: Office Macros 1/15 through 3/15 < 1000/day on average. One involves using the display:none attribute while the other involves reversing the code. offered by security vendors to understand macro behavior, malware authors now thrive on code obfuscation, sandbox detection and bypass techniques. As we all know, equations must balance, and this equation’s balance has an obvious element of doubt. b=1) so it will print space (20 times!!). This results in polymorphic malware, with evolving obfuscation patterns and multiple obfuscated variants of the same malicious macro. Obfuscated code is source code that is (perhaps intentionally) very hard to read and understand. To save macro and action bar space, you can combine the two macros in the following script. Delphi Junk Code Obfuscator - CodeMorph Delphi junk instruction obfuscator can insert junk code and junk instruction to Delphi and Object Pascal source code files. Once again, we’ll need to click on View Macros to display the Macros dialog box. Protect a VBA code (Excel): obfuscation is the only effective solution to protect a VBA code against copying, modification. In Syntax Highlighting settings' panel there is a predefined highlighting mode for C/C++, but the predefined mode does not handle colors for functions, macro definitions and I failed to find the way to add them to the predefined list. Explanation: The macro uses the InputBox method of the Application object. So be ready to spend from hours to days before you get protected version of your code that works correctly after obfuscation. h files used in the example designs. Obfuscation While there are many different approaches to obfuscating interpreted code, several stand out. The macro executes a shell command that downloads and runs the particular malware. 3 Function to remove the garbage characters. Toutes ces opérations rendent le code source de la macro quasiment illisible. 0 macros, contained in MS Excel files (XLS, XLSM, and XLSB). [1][2][3][4][5] In it we highlight the use of five publicly available tools, which have been used for malicious purposes in recent cyber incidents around the world. To assign a macro (one or more code lines) to the command button, execute the following steps. Years ago, I heard a story that at one point there were two Stephen R. In order for this obfuscated macro to work, the above variables are parsed and the values extracted using the InStr() function to generate the destination URL from which to download the malicious executable payload. vbs that turned out to be a Banker. txt) ainsi que le code source après obfuscation dans un fichier séparé (. 8 May 2015 For a while, malicious Office documents are delivered with OLE objects containing VBA macros. not seeing the ones I created. Plugins Best Practices. This seems to have started with 5. Just like you can use password to protect workbooks and worksheets, you can also set a password for protecting the macros in Excel. Hi all! I have a MS Word document I need to share with a third party that I need to obfuscate. As now it is clear that the macro launches the Powershell and performs some commands our next step would be to extract this Powershell obfuscated code directly from memory. I don't mind using function-like macros in a way similar to functions. Here’s the fully deobfuscated macro: 3. The format operator uses format tokens like {0} and {1} to identify the order of replacement strings, so obfuscating the invocation of New-Object might look like. "mere rationalizations to obfuscate rather than clarify the real issue". that obfuscation techniques are effective in avoiding the AV detection. There are a few statements among these macro-formulas that allow executing malicious code, these are named EXEC, RUN and CALL. The extension was initially used for plain text documentation on several different operating systems. These functions like FORMULA, CHAR, and APP. Macros can often be an editor’s best secret weapon by increasing your editing speed and consistency, but not everyone is familiar with how to install and use them. Analyzing obfuscated VBA macros to extract C2 IP/URLs regardless of runtime behavior Introduction Lately, we have been seeing quite a lot of Office documents (or XML files with embedded Office documents, etc. The first step in malware analysis is to take a look at the code itself. Macro downloaders have been evolving since they reappeared in the wild mid-October 2014. 1 foo bar #t) expanded to: (define (name) #t) Well that explains it. Here are some exercices left to the reader 🙂 More stealth. 3 Function to remove the garbage characters. It helps us to find how attackers are improving their techniques to bypass security controls and to fool the victims. A variadic macro is a feature of the preprocessor whereby a macro is declared to accept a varying number of arguments (similar to a variadic function). Macros should never hide declarations, and they should not hide pointer dereference operations from the code. The obfuscation is deliberate, dressing up a statement to make it both innocuous and indeterminate. An obfuscated Microsoft Word macro-enabled file starts a PowerShell process which loads the payload into memory. E-mail Obfuscation Techniques >> This article gives two different methods for obfuscating email addresses with CSS. Obfuscated C Contest: n. Fully customizible obfuscation through the easy-to-use Tagging system. It’s quite easy to do, and the results are anonymous excluding the signature names of the invoked def macros, which can be manually obfuscated. 0, or XLM macros, is a 30-year-old feature of Microsoft Excel that has been gaining popularity among malware authors and attackers, especially over the last year (see Chart 1). Note how Keynes tries to turn his earlier inaccurate statement into an equation, and then connect it to his assumption. The obfuscated script retrieves a PowerShell command which downloads DanaBot [4] to the %TEMP% folder and executes it. Execution of the macro should pause at the beginning of the autoopen2 function. One simple method is to simply XOR with some fixed constant. The first de-obfuscated part of the script looks like this. ' To Unobfuscate a value simply run the obfuscated value back ' through this sub and the result will be the clear text. With macros, these commands can be used from action buttons, and many of them can be used at once. Mar 7, 2014. This report is a collaborative research effort by the cyber security authorities of five nations: Australia, Canada, New Zealand, the United Kingdom, and the United States. In order for this obfuscated macro to work, the above variables are parsed and the values extracted using the InStr() function to generate the destination URL from which to download the malicious executable payload. Invoke-Obfuscation offers a variety of obfuscation techniques, and by analyzing the script we were able to ascertain the specific options in this attack. This function will be. Plugins Best Practices. Its obfuscation is simply achieved by adding garbage characters to the actual string. Without the option, more class members can be mapped to the same short names like 'a', 'b', etc. Pre-processing adds complexity to an implementation, which must trade performing preprocessing against maintaining the code in close to its original form. Trojan Downloader. Bad guys are always using obfuscation I can see an increase of spear-phishing attacks containing attached Office documents with malicious macros (VBA). The theoretical reason is that texts constitute one important form of social action (linking the ‘macro’ level with the ‘micro’ level). The Malicious Macro Generator is an open source Python script to generate obfuscated macros that include anti-virus and sandbox evasion techniques. A bad approach to dead code detection is a run-time analysis that logs all calls when the program executes. ret int 2dh db 0c2h endm CLOAK3B macro ;int. ) that have embedded VBA macros on our malware analysis service , which try to drop Dridex or similar. And that brings an end to our short analysis! We could go about reversing the decryption routine, but that wasn’t the focus of this particular topic, it was more about deobfuscation than analyzing! So, to recap, when reversing obfuscated macros: Locate the entry point function. The XilSKey macro library provid es a convenient structure to program the BBRAM and eFUSEs. Another factor is the continuous enhancements in their routines: just recently, we observe that the macro malware related to DRIDEX and the latest crypto-ransomware variant, Locky ransomware, used Form object in macros to obfuscate the malicious code. ENABLE_PREPROCESSING = YES MACRO_EXPANSION = YES EXPAND_ONLY_PREDEF = YES PREDEFINED = __attribute__(x)= For a more complex example, suppose you have the following obfuscated code fragment of an abstract base class called IUnknown: /*! A reference to an IID */ #ifdef __cplusplus #define REFIID const IID & #else #define REFIID const IID * #endif /*!. It can contain several different types of data such as images, formatted as well as plain text, graphs, charts, embedded objects, links, pages. The key macro that triggers the payload is the function "AutoOpen()". This URL will work forever, so it’s technically the least secure of all the SSO methods. You may think of document macro viruses as a thing of the past. Next, on the View tab, click on "Macros" on the right-hand side. AMSI has no visibility into XLM macros (for now) Anti-virus struggles with XLM (for now) XLM macros can access the Win32 API (think virtualalloc and createthread). The best tool and the tool of choice for this type of job is Invoke-Obfuscation by Daniel Bohannon. User macros are helpful in specif. There are a few statements among these macro-formulas that allow executing malicious code, these are named EXEC, RUN and CALL. Code Builders: Simplify Coding Chores. For example: Chr(Format(14 + 5 + 18 + 2 + 60)) -> Chr(99) -> “C”. Office loads VBA resources, possible macro or embedded object present An obfuscated cmd. After execution, a list of the unused parts is built. The macro is checking if a specific process is running (example outlook. In Phase 2, multiple obfuscation areas are generated according to the user’s privacy requirements. dll --obfuscate -G payload. _MTPR, _MFPR are builtins for the 'move to/from processor register' instructions; you can look up the register numbers in any VAX handbook. This test case was created with Empire. The Macro Stepper says that the use of our macro: (hyphen-define/wrong1. " CIH (September 1998) CIH, also known as Chernobyl or Spacefiller, is a computer virus written by Chen Ing Hau (Chen YingHao) of Taiwan. Debug in Office VBA to retrieve decoded script; 3. which then backfired on him because he tried to use a flawed. You're up against a different kind of defense and will need to work around it accordingly. In this case I review a Trickbot downloader which hides an interesting nuance if. When writing code that can be compiled with -ansi and the various -std options, use __asm__ instead of asm (see Alternate Keywords). This test case was created with Empire. Unlock the Power of Data. Macro Pack – Automatize Obfuscation and Generation of Malicious Office Documents Malware delivery trends change every day. Malware delivery trends change every day. Thomas Clarke, who runs a macro fund at William Blair and has a lot of experience in pricing currencies, says that it makes sense that if. hta, go to the end of the file and add the next code between calls to "autoopen" and "close". How do I use a formula to extract email address in Excel. Screenshot of obfuscated macro code. The version that fits into a 255 character macro is given below and it is somewhat obfuscated:. The goal of the embedded Visual Basic code is to get Emotet’s executable hosted on the remote server by running Windows PowerShell. The --obfuscate flag provides some basic obfuscation for our XLM macro. Macro preprocessors are often used to create hard to read code by masking the standard language syntax and grammar from. Most anti-virus programs can easily read the attacker’s raw code and block, so I used -o parameter to obfuscate malicious VBA payload. The obfuscated script retrieves a PowerShell command which downloads DanaBot [4] to the %TEMP% folder and executes it. Counting Entries Consider the following use case for populating enumerations and jump tables:. Diagrams of board positions in the games of Havannah and Hex. Transparent to end user. * an asterisk starts an unordered list * and this is another item in the list + or you can also use the + character - or the - character To start an ordered list, write this: 1. NET assembly DLL. [1][2][3][4][5] In it we highlight the use of five publicly available tools, which have been used for malicious purposes in recent cyber incidents around the world. 7, 8 Figure 6. There's no need to create extra build steps, just include it and use it. This article continues the discussion in Part 1 regarding the use of X macros. To counter this, tools could be developed to obfuscate most names (except ones referencing built-in functions and variables) and/or manipulate bytecode and file format to require manual cleanup. Upon opening this spreadsheet, a malware executable is dropped using the VBA macro code and to distract the user, it also opens a decoy spreadsheet. Macro Pack – Automatize Obfuscation and Generation of Malicious Office Documents Malware delivery trends change every day. Obfuscate control flow using Dotfuscator, then again "control flow" obfuscate the obfuscated exe using. The obfuscated macro code attempts to run an obfuscated Cmd command which in turns executes an obfuscated Powershell script. Sample malicious XML with encoded VBA macro code. Non-Expiring – Provide user a partially obfuscated URL to automatically login to iDashboards. Otherwise, it continues to the next phase. 3 Macro Workflow. This type of macro code is actively being abused and weaponized by attackers to deliver additional, more persistent malware. A SOLID Dassault Systèmes Platinum Partner. These tools mess with variable and function names as well as string and integer constants. The first de-obfuscated part of the script looks like this. In these attacks, hackers send an email with a. This macro's absence is not actually a bug. Let's look at several real-life examples. In addition, user macros allow strings with illegal characters (Such as ! and $) to be used in the Core Configuration Manager. The --obfuscate flag provides some basic obfuscation for our XLM macro. Companies use name obfuscation to protect intellectual property embodied in the distributable source code. Thomas Clarke, who runs a macro fund at William Blair and has a lot of experience in pricing currencies, says that it makes sense that if. General infection and de-obfuscation flow is as follows:. I wrote a proof of concept tool that provides insight into what it's doing. • Embedding an executable in a macro (executable2vbs) • Network-tracing macro • Multi-stage macro malware using DNS for payload retrieval and exfiltration • Macro malware performing direct shellcode injection • Macros on PowerPoint (Custom Actions) • Macro obfuscation 1. Users must enable macros in order for these malicious documents to work. How to obfuscate VBA code? BOB; Jan 15, 2014; Replies 6 Views 3K. The user then opens the document containing the (malicious) macro. 17 APR 2020 Another Way to Analyze XLM Macros XLM macros have been making a comeback so it's important to be able to analyze them. "the spelling changes will deform some familiar words and obfuscate their etymological origins". Obfuscation If temporary storage is needed during the expansion of a macro, unusual Magical Girl Raising Project (1,510 words) [view diff] exact match in snippet view article find links to article. Obfuscated code is source code that is (perhaps intentionally) very hard to read and understand. This obfuscated macro got a much lower VirusTotal score: Obfuscation Detection: Why, Challenges and How. Code Virtualizer is a powerful code obfuscation system for Windows, Linux and Mac OS X applications that helps developers to protect their sensitive code areas against Reverse Engineering with very strong obfuscation code, based on code virtualization. offered by security vendors to understand macro behavior, malware authors now thrive on code obfuscation, sandbox detection and bypass techniques. bz2 - all of the data for 1985 (4. Macro pre-processors are often used to create hard-to-read code by masking the standard language syntax and grammar from the main body of code. Uptime check. Sep 6 2011, 04:06 PM. The macro_pack is a tool used to automatize obfuscation and generation of MS Office documents for pentest, demo, and social engineering assessments. Researchers at Trend Micro recently observed a change in the Dridex and Locky macro malware families, which are now using Form object in macros to obfuscate their malicious code. The Macro View – Health, Financial And Political N Here Is The Transcript Of The Senate Hearing On Th Is This The Biggest Threat To Keeping Your Informa Obfuscation And Obstruction Really Have Become Sta Useful Recording Of The Evidence Given For The Sen Commentators and Journalists Weigh In On The MyHR. Obfuscate the stored data. Overall, malicious documents are one of the most common methods of initial breach. A first round of obfuscation technique was adopted by the attacker in order to make harder the analyst’s decoding process. msoffice-crypt-d -p pass file. The PowerShell code formed in the previous step is highly obfuscated. It is most useful for distributing functionality in a commercial product or a high user volume environment where you wish to hide proprietary. You may also add some macros with "junk" code in order to obfuscate other parts (not related to function calls) of your code. The macro makes use of obfuscation to execute a cmd command, which is also obfuscated. macro_pack will simplify antimalware solutions bypass and automatize the process from vba generation to final Office document generation. They also use macro pre-processors to mask the standard syntax and grammar from the main body of code. The goal of macro_pack is to simplify exploitation, antimalware bypass, and automatize the process from malicious macro and script generation to final document generation. As a side note, we did not find a better project to find bugs in the obfuscator than mimikatz. msoffice-crypt-d -p pass file. [FEATURE] Client/Server: Web macro->Added cookies sharing between Tasks (VC-596) Windows forms obfuscation has been applied on passwords in general (VC-1187). Once the macro is enabled, it is executed and presents the victim with a decoy progress bar, likely intended to make the malicious document appear more legitimate and stall the victim while the malicious code is being executed. Hunt Stats: Office Macros 1/15 through 3/15 < 1000/day on average. Now we can discuss how to obscure your programs. These emails are carefully crafted such that you open it without any suspicion. Obfuscated code is source code that is very hard to read and understand. ) that have embedded VBA macros on our malware analysis service , which try to drop Dridex or similar. [1][2][3][4][5] In it we highlight the use of five publicly available tools, which have been used for malicious purposes in recent cyber incidents around the world. exe) Obfuscation. There is also a menu item in the Tools menu for that purpose. A first round of obfuscation technique was adopted by the attacker in order to make harder the analyst’s decoding process. •Malicious macros need to start automatically. 0 macros, contained in MS Excel files (XLS, XLSM, and XLSB). It seems that some of the "shifted" characters in the macros are being dropped when passed to the Solaris 11. VBA obfuscation is a set of techniques that hide the intent of an Excel VBA program without changing its runtime behavior. • Regarding the use of the cipher, RC4 itself is used as an obfuscation technique to hide the network layer. Some languages are more prone to obfuscation than others. where in the last form, asm-qualifiers contains goto (and in the first form, not). This actually can be a good idea anyhow as often times you’ll spend about 10/15 tools parsing the json,xml, or other data that is returned. But why an entire framework for cmd. ' Input(s) : value - The value to Obfuscate. The Bourne shell code, along with the 4. that obfuscation techniques are effective in avoiding the AV detection. Address Space Layout Randomisation (ASLR). By obfuscation, you mean a sort of data step code encryption? If so, try the. Reverse Engineering an Obfuscated Malicious Macro. In our case, replication of at-a-glance obfuscation detection. For starters the macro hides one of the return paths from the function. The key is finding a way to get a shell and a delivery method that. Now we need to define the payload part that we need to obfuscate. This technique is recently seen in macro malware related to DRIDEX and the latest crypto-ransomware variant, Locky ransomware, used Form object in macros to obfuscate the malicious code. → Obfuscation is a delightfully fussy word that means “the process of making something obscure, unclear or unintelligible. CLOAK1B macro ;int. See the "Special Tools" and Best Practices Sections below Free tools, macros, spreadsheets Clean Up Windows desktop Project Progress log and Pie Chart MS-Word privacy unmasked 1-Click header/footers added to many tabs What would YOU like to solve or improve? System Get Environment Variables, Fix Illegal Filenames Data Cleanup when pasted or inherited from … Continue reading "". The winning code for the 27th contest, held in 2020, was released in July 2020. pdf here to be very helpful in understanding what is going on. Unlock the Power of Data. bas file that you downloaded and click Open. (NOTE: In versions of Project prior to 2013, it'll be in Tools → Macro) File → Import File; Select the obfuscate. The goal of macro_pack is to simplify antimalware solutions bypass and automatize the process from vba generation to final Office document generation. Unlike many other packages there is no “installation procedure” — you just put the macros themselves in your T E X macros directory. Let's look at several real-life examples. Why do you need Access Excel VBAChr Function? 1. In the above macro snippet, other small functions and variable declarations obfuscated using simple character obfuscation are visible. The team said that while the hundreds of unique Excel files in this campaign use "highly obfuscated formulas", all of them connect to the same URL to download the payload. exe visibility • Command line arguments • Parent/child process relationships • Source of action on registry, files, etc. For instance, a macro that makes the player yell "Everybody, dance now!" and burst into dance would be written thus. 17 February 2020 - POI 4. Macro Security (through Obscurity/Obfuscation) - posted in Ask for Help: Hi,Im working on a fairly large project using AHK and am exploring my options to protect the exe file from decompilation, etc. Execution of the macro should pause at the beginning of the autoopen2 function. Unfortunately, it doesn't have real functions; only macros, with bizarre substitution semantics. The overall winner is whoever produces the most unreadable, creative, and bizarre (but working) C program. For instance, all strings and function calls in the macro are obfuscated. Here is an example: AR c A m 4Y d AJ. Microsoft: Beware this massive phishing campaign using malicious Excel macros to hack PCs. This document is intended for use by Nagios XI Administrators that wish to obfuscate arguments that may contain sensitive information. Its VBA macro code is not very obfuscated, but it is a good example of a simple downloader and dropper. For instance, all strings and function calls in the macro are obfuscated. De plus JO-OBfuscator sauvegarde le code source initial dans un fichier au format texte (. Base64 encoding is perhaps the most popular method of obfuscation but is easily identified by even basic anti -malware engines. 0 macros, contained in MS Excel files (XLS, XLSM, and XLSB). And let's not forget the best one of all - not a single comment !. I removed the Skype handle of the malware author and part of the host-name And to show you that it’s not always that easy we will have a look at some parts of a file called Curriculum_vitae_Suzana_p. One-time pad. However, if you are new to data obfuscation in general, I'd start with the wiki entry (see above). Check out the blog to know more! Emotet Malware - A new variant of Emotet trojan has been observed since mid-January. Afterwards, this part of the script deobfuscates the VBS and saves it onto the machine, executing wscript. This macro then starts the obfuscated batch code with which the command line is opened and controlled. h files used in the example designs. The compiler option -D can be used to define the macro MY_MACRO from command line. Understanding Cell Values And Displayed Text. By trying it i found out that it is neccessary to make use of macros. However, many macro-based attacks utilize. It will ask you save this obfuscated project. Obfuscation of PowerShell scripts takes many forms. This tool can be used for redteaming, pentests, demos, and social engineering assessments. The Obfuscation is controlled using a key specified by a line beginning with “ObfuscateKey:”. Before moving on to Reflection and the Reflector tool, I thought I’d first follow up on this previous post. Uptime check. To inspect or modify the value of an Obfuscation attribute, select first the affected profile member. August 5, 2020. When statistics obfuscate meaning Madan Sabnavis | Updated on March 09, 2018 Published on December 11, 2017 Numbers game They don’t always add up - tinkivinki/shutterstock. The Obfuscation is controlled using a key specified by a line beginning with “ObfuscateKey:”. While the later is a complicated subject, obfuscation is pretty simple. This means that instead of an analyst opening up our macro sheet and immediately viewing the macros, they would have to scroll at least 100 columns to the right. In fact they are called macro-formulas. In these attacks, hackers send an email with a. Utterly Banned Posts: 224 Joined: 15-February 11: Hi, On interesting subject i guess and. First, we automatically move the XLM macros some random amount to the right in our Excel document. Let’s look at the commands in column Q section by section. This macro is heavily obfuscated with junk code and random variable/function name. The macro uses simple obfuscation by inserting garbage characters into real strings. In Phase 2, multiple obfuscation areas are generated according to the user’s privacy requirements. All these elements are not too characteristics of the canonical APT28 droppers, in which the heavy obfuscation has been traditionally adopted. This actually can be a good idea anyhow as often times you’ll spend about 10/15 tools parsing the json,xml, or other data that is returned. Find the best information and most relevant links on all topics related toThis domain may be for sale!. For the recent sample, the URL string used inside the JScript code was obfuscated in two layers; it had to be decoded using base64, then decrypted using a routine that extracts and converts a Unicode number to a character. Some ancient history. 0 macro functions is here. Looking into the macros we see a new technique used to obfuscate its code not seen before (as far as know). Companies use name obfuscation to protect intellectual property embodied in the distributable source code. I have converted the obfuscation algorithm to an equivalent Python and the scripts used for evasion techniques into VBA scripts for easy understanding. Macros can often be an editor’s best secret weapon by increasing your editing speed and consistency, but not everyone is familiar with how to install and use them. They also use macro pre-processors to mask the standard syntax and grammar from the main body of code. Sample malicious XML with encoded VBA macro code. https://ringzer0team. There are three pieces to this exploit -- the Word document, a text file which will get downloaded when the macros are enabled, and. It has the following obfuscated macro code: The decrypted PowerShell script looks like the following: Another variant uses the below macro less technique to download the malicious files from the remote machines : When the user clicks. An obfuscated Microsoft Word macro-enabled file starts a PowerShell process which loads the payload into memory. NETWORK TRAFFIC. The point: no amount of "obfuscation" is going to help you in this situation. The winning code for the 27th contest, held in 2020, was released in July 2020. a3x method to obfuscate the code --- here is the rest of the render fix you need!. During debugging, a user should not have to step through macro expanded cruft, no more than they should have to step through code obfuscated by optimizations. Looking into the macros we see a new technique used to obfuscate its code not seen before (as far as know). The commands for starting with Invoke-Obfuscation are: Import-Module. This article continues the discussion in Part 1 regarding the use of X macros. The sample analyzed incorporated malformed document headers, malicious embedded VBA macros, PowerShell commands, heavily obfuscated JScript, startup persistence, and payload hiding in NTFS alternate data streams. The user then opens the document containing the (malicious) macro. CodeMorph ™ code obfuscator is an professional commercial solution which offers code obfuscation for C/C++ and Delphi (Pascal) compiling language, to protect software applications from reverse engineering, analysis, trace and cracking. The Wikipedia definition of Obfuscation is: "Obfuscation is the willful obscuring of the intended meaning of communication, usually by making the message confusing, ambiguous, or difficult to understand. For example: Chr(Format(14 + 5 + 18 + 2 + 60)) -> Chr(99) -> “C”. doc extension represent documents generated by Microsoft Word or other word processing documents in binary file format. Note that the " 1 " as the first parameter to the StackFrame constructor tells it to skip ONE frame up the stack, while the true tells it to capture the file and line info. For Excel senior user, they always create some VBA codes to solve the complex problems. The first samples seen had an average length of 150 lines. Spencer Dodd. A snippet of Powershell code created from the execution of the VBA macro in the first OLE Object. Right click CommandButton1 (make sure Design Mode is selected). In January 2017 with v1. If it finds it, it knows its a virus. This procedure doesn't take much time that's why it is recommended to obfuscate programs before releasing them. It can contain several different types of data such as images, formatted as well as plain text, graphs, charts, embedded objects, links, pages. It is very simple to use:. Overall, malicious documents are one of the most common methods of initial breach. Malware delivery trends change every day. In Excel, macro code is a programming code which is written in VBA (Visual Basic for Applications) language. Its for loops only go up, not down. NETWORK TRAFFIC. Function macro definitions accept two special operators (# and ##) in the replacement sequence: The operator # , followed by a parameter name, is replaced by a string literal that contains the argument passed (as if enclosed between double quotes):. The macro is checking if a specific process is running (example outlook. The assistant lists all appropriate values for this attribute:. The Document_Open macro function is automatically triggered by Word once the user presses the “Enable Macros” button. It was very difficult for me to correlate the obfuscated code with the original code, and it is because of the strong obfuscation of Crypto Obfuscator. Dropping and starting an executable is a big chance to trigger AV, create a suspicious file and process, and possibly leave more logs to clean up. So be ready to spend from hours to days before you get protected version of your code that works correctly after obfuscation. You can also obfuscate your code for situations where you need to distribute your source code, but are concerned about its misuse. Power BI and Excel offer a wide variety of collaboration and sharing experiences. Hi all! I have a MS Word document I need to share with a third party that I need to obfuscate. Still though, in 2020, Microsoft Excel supports Excel 4 macros for backwards compatibility reasons. 96 was released on 31 December 2019. Once again, we’ll need to click on View Macros to display the Macros dialog box. If it finds it, it knows its a virus. that obfuscation techniques are effective in avoiding the AV detection. C, C++ and Perl are most often cited as easily obfuscatable languages. File name:-. This results in polymorphic malware, with evolving obfuscation patterns and multiple obfuscated variants of the same malicious macro. From Java Security Exploits to Trojan horses and Worms, our Viruses dictionary offers a glossary of terms you need to know. This means malware authors need to convince users to turn on macros so that their malware can run. The macro was also obfuscated and contained randomly generated comments to make the code appear benign and help it evade detection by security solutions. Advanced obfuscated JavaScript analysis by Daniel Wesemann. Value < 1000000000 And r. Please note the available assistant you can activate by clicking on the button right to the attribute. Some of these are as simple as using an obfuscation tool to make the macro code difficult to interpret, but some are much more complex, such as a technique called VBA Stomping. As for what we might see next, we’d recommend reading up on DOS command line tricks so that monitoring your network isn’t the first time you see new attacker tricks. This obfuscated macro got a much lower VirusTotal score: Obfuscation Detection: Why, Challenges and How. Here I will examine several more uses of X macros that relieve the programmer from having to manually enforce dependencies and perform data structure sizing calculations. "the spelling changes will deform some familiar words and obfuscate their etymological origins". A SOLID Dassault Systèmes Platinum Partner. not talking about source code obfuscation (to make source code unreadable or something), I'm talking about obfuscating native (executable) code (to make executable be harder to disassemble/decompile using different reverse ingeneering technicks). Including the line “Obfuscate:SWAP” causes passage text in the generated HTML to be obfuscated using a basic char-swap algorithm (normally, story text is stored in the HTML as raw Twine code, which means people can obtain spoilers by reading it). Utterly Banned Posts: 224 Joined: 15-February 11: Hi, On interesting subject i guess and. But, sometimes, they want to protect the VBA code from being viewed or destroyed by others. A firework display in obfuscated T e X. Macro Obfuscation. For instance, all strings and function calls in the macro are obfuscated. not seeing the ones I created. Macro Security (through Obscurity/Obfuscation) - posted in Ask for Help: Hi,Im working on a fairly large project using AHK and am exploring my options to protect the exe file from decompilation, etc. Macro downloaders have been evolving since they reappeared in the wild mid-October 2014. This is a macro package for drawing so-called “commutative” diagrams in category theory and related subjects. My primary concern is casual copying, by people decompiling and then stripping license key checks, etc. Macros are also robust, and provide various functions that can be leveraged to evade analysis, such as obfuscating the final payload, modifying the control flow, or detecting automated sandbox analysis through specific host environmental checks. It is most useful for distributing functionality in a commercial product or a high user volume environment where you wish to hide proprietary. In the assembler days, there was the Macro Assembler. For starters the macro hides one of the return paths from the function. Find the best information and most relevant links on all topics related toThis domain may be for sale!. I'd like to apply a formula to obfuscate the 'my_campaign01' part and I'm looking to do a little brainstorming here in the forums. I have converted the obfuscation algorithm to an equivalent Python and the scripts used for evasion techniques into VBA scripts for easy understanding. Years ago, I heard a story that at one point there were two Stephen R. A bi-weekly, non-comprehensive roundup of news of beer and other things. Therefore,we first describe this macro. The file itself was named with a. This appendix explains how to transfer your Java programming skills to a substantial subset of C++. A snippet of Powershell code created from the execution of the VBA macro in the first OLE Object. Power BI and Excel offer a wide variety of collaboration and sharing experiences. So, finally what I did was: 1. However, if you are new to data obfuscation in general, I'd start with the wiki entry (see above). Macros can often be an editor’s best secret weapon by increasing your editing speed and consistency, but not everyone is familiar with how to install and use them. But to make the job easier, the Apex team needn't invent any of these. But let's focus on the task at hand: determining whether a macro is defined (and after that, possibly do further tests on its value). Academics can keep hiding the manipulative sides of economic relationships and then complain that they are not understood. The goal of macro_pack is to simplify exploitation, antimalware bypass, and automatize the process from malicious macro and script generation to final document generation. Obfuscate control flow using Dotfuscator, then again "control flow" obfuscate the obfuscated exe using. DIM is the statement which is used to create any variable. Including the line “Obfuscate:SWAP” causes passage text in the generated HTML to be obfuscated using a basic char-swap algorithm (normally, story text is stored in the HTML as raw Twine code, which means people can obtain spoilers by reading it). Furthermore, using the polymorphic obfuscation technique for the macros has caused difficulties in writing signatures for detection. Bourne, but even then not quite specific enough. To execute the downloaded malware with high system privilege, it utilizes an already known UAC-bypass technique. After execution, a list of the unused parts is built. Obfuscating code to prevent reverse engineering is typically done to manage risks that stem from unauthorized access to source code. I wrote a proof of concept tool that provides insight into what it's doing. This is necessary for students who take their first programming course in Java and the second course in C++. Analyzing obfuscated VBA macros to extract C2 IP/URLs regardless of runtime behavior Introduction Lately, we have been seeing quite a lot of Office documents (or XML files with embedded Office documents, etc. Hoping you might be able to take a look at some recent extracted word macro’s and possibly add plugin functionality to extract badness or better detect these URL’s ? The URL obfuscation techniques used are quite varied…. Non-Expiring – Provide user a partially obfuscated URL to automatically login to iDashboards. @Keith-Albert said:. ) that have embedded VBA macros on our malware analysis service , which try to drop Dridex or similar. DIAN_caso-5415. Users must enable macros in order for these malicious documents to work. As with most plaintext, scripting languages, macros typically rely on obfuscation. Macro source codes are easy to obfuscate, and a plethora of free tools are available for attackers to automatically do this. With macros, these commands can be used from action buttons, and many of them can be used at once. Once macros are enabled, the information regarding the protected document is deleted and a title “Emergency exit map” is shown. But here’s a quick summary for those who are. xls-p plugin_http_heuristics Find obfuscated URLs in file. The implementationutilizes a macro called RC4 round that is used in both the KSA and the PRGA. 23 This tool will allow obfuscation of UNIX scripts listing an interpreter as the first line. The winning code for the 27th contest, held in 2020, was released in July 2020. $ gcc -Wall -DMY_MACRO main. This approach has some advantages, such as that the shell will not die when the program is closed, but it not ideal for a number of reasons. They were included in Excel 4, but when Excel 5 came out (in 1993!) this type of macros was replaced with VBA. How do I use a formula to extract email address in Excel. The source code is in C to give an example. The macro, in turn, contains an obfuscated JavaScript (jse) file. Macros should never hide declarations, and they should not hide pointer dereference operations from the code. Start a new line in a Cell with Char(10) in worksheet (must need to set Wrap Text first) and MsgBox message. 50 = xlExcel12 (Excel Binary Workbook in 2007-2016 with or without macro's, xlsb) 56 = xlExcel8 (97-2003 format in Excel 2007-2016, xls) Note : I always use the FileFormat numbers instead of the defined constants in my code so that it will compile OK when I copy the code into an Excel 97-2003 workbook (For example, Excel 97-2003 won't know what. The International Obfuscated C Code Contest (abbreviated IOCCC) is a computer programming contest for the most creatively obfuscated C code. Certificate files as an obfuscation technique The idea of using certificate files to hide malware is not a new one: a proof of concept was introduced late last year by Sophos in which they demonstrated placing an Excel file with an embedded macro inside a certificate file. docm using password pass to create file2. Obfuscation … is inherent in SKI combinator calculus :-) In addition, it uses various hacks to parse SKI code as C, and to satisfy IOCCC’s size rule. So, to recap, when reversing obfuscated macros: Locate the entry point function; Identify the obfuscation used (junk code, functions, etc. Une page sur l'actualité des cas d'attaques qui utilisent des scripts malicieux (Microsoft VBS, Microsoft PowerShell, macros Microsoft Office, JavaScript) pour installer des Malwares / Virus. They also use macro pre-processors to mask the standard syntax and grammar from the main body of code. Here's a few highlights: XLM (Excel 4. If the users clicks Cancel, this method returns False and nothing happens (InputBox disappears). The extension was initially used for plain text documentation on several different operating systems. This document describes how to implement and use user macros in a working environment. The obfuscated macro code attempts to run an obfuscated Cmd command which in turns executes an obfuscated Powershell script. Before moving on to Reflection and the Reflector tool, I thought I’d first follow up on this previous post. 2) Add self destruct routine Edit magic_dropper. How do I use a formula to extract email address in Excel. offered by security vendors to understand macro behavior, malware authors now thrive on code obfuscation, sandbox detection and bypass techniques. Of course it will only work with ASCII strings, which here are treated as integers. Using XyPerl your first example would become:. hta, go to the end of the file and add the next code between calls to "autoopen" and "close". I removed the Skype handle of the malware author and part of the host-name And to show you that it’s not always that easy we will have a look at some parts of a file called Curriculum_vitae_Suzana_p. Hi SteGa, your code works fine for me in NX8, this is what I needed but I have a small problem in it, I have to call multiple macros from program, when I use this code and call multiple macros only the last macro is executed, there are no errors or exception, in logfile I can see other macros getting called but not executed. Obfuscation If temporary storage is needed during the expansion of a macro, unusual Magical Girl Raising Project (1,510 words) [view diff] exact match in snippet view article find links to article. The same sort of thing is true on the average PDP-11, except that the console DL-11 (or similar) has status and data registers in the I/O page. Figures 6 and 7, demonstrating obfuscated code, show the impossible task of understanding the obfuscated code. Here’s the fully deobfuscated macro: 3. In recent years, the revival of malicious VBA macros has become quite popular among cyber criminals. Feb 13, 2016 · ADVobfuscator is an obfuscation library created by Sebastien Andrivet that uses C++11/14 to generate compile-time obfuscated code without using any external tool, just C++ code. _MTPR, _MFPR are builtins for the 'move to/from processor register' instructions; you can look up the register numbers in any VAX handbook. We already explained the need for and basics of obfuscation, and yet developers I meet are often still surprised to discover how easy it is to decompile their. Process check. Value = "XXX-XX-" & Right(r. An example of an obfuscated PowerShell command run by an Emotet document dropper in a sandbox environment9. You may be able to make use of the Obfuscate macro below (if you are not in a hurry that is as I expect this code to be sloooow if you have lots of sheets and data). Data Obfuscation Data obfuscation is a form of data masking where the data is purposely scrambled so that it becomes very difficult for a person to understand the semantics of the code. c, xilskey_efuseps_zynqmp_input. For the last few years, we have observed various hacker groups like ( APT12 to Turla ) uses various techniques to deliver malware on the system or network. This was the issue that was faced by the users of the newly built Microsoft Office. 17 APR 2020 Another Way to Analyze XLM Macros XLM macros have been making a comeback so it's important to be able to analyze them. doc is a quite old malware sample from 2009. Pointing out the difference does not breach impartiality, but informs the debate. Of course, a "return" statement inside a function-like macro means it. This tool can be used for redteaming, pentests, demos, and social engineering assessments. Obfuscating with retroguard actually speeds up the startup time since variable names are shorter and the resulting. Obfuscated code has the same or almost the same semantics than the original and obfuscation is transparent for the system executing the application and for the users of this application. • Embedding an executable in a macro (executable2vbs) • Network-tracing macro • Multi-stage macro malware using DNS for payload retrieval and exfiltration • Macro malware performing direct shellcode injection • Macros on PowerPoint (Custom Actions) • Macro obfuscation 1. exe, cscript. This is followed by Base64 encoded data, which contains the compressed and obfuscated VBA macro code. Understanding Cell Values And Displayed Text. catvba from BazaPK. The point: no amount of "obfuscation" is going to help you in this situation. Looking into the macros we see a new technique used to obfuscate its code not seen before (as far as know). The “macro” code is very simple and straightforward but they managed to add a few tricks to evade detection. 23 This tool will allow obfuscation of UNIX scripts listing an interpreter as the first line. An effective solution to protect VBA code is obfuscation, in other words, the solution is to make your VBA code "unreadable" (but still operational). While some people may argue that Clojure is already obfuscated by default, I think it is about time to organise an official International Obfuscated Clojure Coding Contest similar to the IOCCC. Protect a VBA code (Excel): obfuscation is the only effective solution to protect a VBA code against copying, modification. class files are smaller. To encrypt a varchar2 string with a specific encryption phrase (or “key. Microsoft warns of 'massive' phishing campaign leveraging Excel 4. Obfuscating code to prevent reverse engineering is typically done to manage risks that stem from unauthorized access to source code. 6 alpha, was removed from the Twine codebase by its author, as it was intended primarily for testing and was never meant for actual end-use. The Apache POI team is pleased to announce the release of 4. Predecessor dependency in MS Project 2007 Emailing Macro. The key macro that triggers the payload is the function "AutoOpen()". Is it possible to have a recursive macro in pic? I don't know, and I gave. An umbrella term that includes any communication device or application, encompassing: radio, television, cellular phones, computer and network hardware and software, satellite systems and so on, as well as the various services and applications.