ViperMonkey is an experimental toolkit that I have been developing since earlyto parse VBA macros and emulate their execution. ViperMonkey is still very, very far from implementing all those features, and it is not yet able to handle most real-life macros. However, in some cases it can be a great help to deobfuscate macros automatically for malware analysis. I decided to release it publicly on GitHubso that malware analysts can start using it, and contribute to its development.Diagram based t 23f defrost timer wiring diagram
Its VBA macro code is not very obfuscated, but it is a good example of a simple downloader and dropper. After execution has completed, vmonkey shows the actions of interest that were recorded, with their parameters:. Let's now look at a more recent sample August : a5e14eecf6bebb05dfce4fe0ff75dddd2eb9c This code is much more obfuscated. Looking at it more closely, there are many calls to a small function called JTCKC which decodes obfuscated strings. The algorithm is simple yet effective: it extracts two characters, ignores the third character.
The two characters form an hexadecimal code. The same algorithm is applied to the rest of the string, to each group of three characters. The parameter of the Chr function is expected to be an integer, not a string. Now that we know the decoding algorithm, it would be possible to manually apply it to all the obfuscated strings in the code.
But that would be tedious, and it looks like the algorithm is applied twice to get to the final payload. Fortunately, vmonkey can do it automatically for us. The emulation engine is extremely slow, but eventually we get useful results at the end:.
Deobfuscating VBA & PowerShell Scripts of an Emotet Trojan Downloader
Looking more closely at the VBA code, the JScript code is not written to a file on disk, but it uses an ActiveX object called " ScriptControl " to run it directly from memory. This one is also quite obfuscated, but in a completely different way: there are dozens of very small functions, which seem to provide small chunks of strings:.
Afterwards, other functions concatenate all these chunks of code to build the payload, and then run it:. There again, it would be possible to reconstruct the payload manually by following the code step by step, but it would take lots of effort.
Like the previous sample, it uses a ScriptControl object to run JScript code. Expect it to break on most real-life samples.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again.
If nothing happens, download the GitHub extension for Visual Studio and try again. This program obfuscates the Visual Basic code from Microsoft Word macros.✔️ VBA Obfuscator Microsoft Word
The transformations applied on the code allows the macros to evade signature scans from Antivirus softwares. You can dispose of the first two lines once it has been executed once on the Word document. The report of this project is available here.
It is in French, so we are sorry for people that don't speak this lovely language. The VBA obfuscator tool is provided for educational and research purposes only. The authors of this project are no way responsible for any misuse of this tool.Laptop making weird static noise
Do not attempt to violate the law with our project, we will not take any responsability for your actions. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.
Sign up. Python Branch: master. Find file. Sign in Sign up. Go back. Launching Xcode If nothing happens, download Xcode and try again. Latest commit. Latest commit da Apr 3, VBA obfuscator Final year school project, obfuscate Word macros.
I have a set of Excel spreadsheets that I am using as source data for a program I am writing. I want to create a set of data that retains the structure of the source data but obfuscates the cell values. In short, I need to keep the column names but should randomize numerical values, name strings, and dates.
Does anyone know of a VBA script that might do some or all of this already? I was set to starting trying to write this from scratch but I feel hope perhaps some of the work may already be done Any advice would be much appreciated. Some videos you may like. Excel Facts.
How can you turn a range sideways? Click here to reveal answer. Copy the range. Select a blank cell. Right-click, Paste Special, then choose Transpose. FDibbins Well-known Member. Joined Feb 16, Messages 6, According to a quick google search StephenCrump Well-known Member. FDibbins said:. So is this what you want? Last edited: May 19, Pretty much what my search said Why use words that some people may need to look up, instead of just stating that you want to overwrite the data with random characters?
Glad you were able to get it sorted without the help of our vokabbalary-limited crowd.
I've done a bit of research and read up here in the archives but there hasn't been anything mentioned in a while so I thought those recommendations could be outdated. Also, please correct me if I'm wrong but from my understanding the simplified logic of a obfuscator is:. Is that correct? What do I need to be looking into when selecting the 'defined logic'? I played around with CrunchCode before and there was a plethora of options but they were all foreign to me. I have bought CrunchCode and beware that it doesn't support bit systems.
Support is really bad no email replies whatsoever over a few weeks. The string encryption feature will screw up all your string comparisons and MsgBoxes, as decrypted strings are not the same as the originals. Recommend to avoid this product! My previous answer was poorly researched and as nobody else has replied I thought you deserved a better answer. Having tested CrunchCode, it appears that it obfuscates through the following techniques:.
The number one obfuscation technique is to strip out all semantics and reduce the likelihood that any context will be inferred. This was commonly a problem in the days of assembly code when it was very hard to tell what the code was going to do unless you were familiar with it.
Overloading of operators through the use of User Defined Functions is a useful technique. Out of 10 interviewees, I was the only one who guessed operator overloading, so this has always stuck with me.
You can make code behave very differently to how it is supposed to. The addition symbol can be made to subtract, divide or any other number of combinations. When something this fundamental is changed in code, it is much harder to understand the source code.
As an additional step, I would probably be tempted to add many redundant methods to the source code. Essentially pieces of code that perform pointless code based on a condition being true.Attention, pen testers: Are you looking to run a phishing campaign that puts your antivirus software to the test? Then this post is for you. In this post, I will guide you through how to build a malicious obfuscated macro in a Word document. I know you may be thinking that there are plenty of tools that generate Visual Basic for Applications VBA for macros, but many of these are either without any obfuscation or already have built-in automatic obfuscators and are often detected or removed by antivirus software.
This post will demonstrate how to leverage different tools and techniques to create an obfuscated macro that evades antivirus software. This method will give you ideas on how to execute a social engineering campaign that really puts your people, not just your antivirus software, to the test.
While many websites have already documented either macro-building tools or techniques, I haven't seen many posts that do a good job of combining these tools and methods to show a final product, which is what I want to accomplish here today.
Think of every section in this post as a tool in our toolkit for designing a macro for phishing attempts. Blindly executing the following commands could result in a number of issues.
Also, as you read this post, think about ways to make the final result even better by modifying existing tools, swapping in new tools, or writing something custom. Sometimes, even minor changes to obfuscation algorithms can help you evade antivirus tools. The key is finding a way to get a shell and a delivery method that cause the user to download and execute the shell with minimal action required from the user.Fcm token flutter
Custom malware seemed like the best way to go. But due to time constraints, I turned to existing malware projects. But antivirus tools may not have signatures or indicators of comprise IOCs for custom malware. You still have to worry about heuristic scans, though. I decided to try to find some kind of public shell that wasn't too feature-rich to avoid detection. Although I found a ton of ways to get a shell, I liked the C shells because they didn't have too many features and 0 AV tools detected them, as Virustotal reports.
This worked well, but I wanted to make sure the commands and traffic I sent and received were encrypted, so I wanted SSL capabilities with it.How to turn on hdr on tcl roku tv
I found what I needed again on GitHub. The end of the Evil Clippy section in this post expands upon this, and we also discuss general AV evasion a bit in our Final Thoughts: Get Creative section. It uses socat and tmux to handle multiple SSL connections. Pretty cool! I didn't learn until later that I was going to execute this shell from memory, but let's assume that's our objective.
This was in the original code:. Host and port are easy to figure out, but what about envvarargumentsand xorkey? What are those used for? It looked like there was a quick for loop that would XOR envvar with the xorkey. So, it looked like envvar should be inputted XOR'd using the key to decode.Choose a Session. Data Security. Andy Green. This article is part of the series "Fileless Malware".
Check out the rest:. The Hybrid Analysis site is the resource I rely on to find these malware critters. While the information that HA provides for each sample —system calls, internet traffic, etc. After extracting the script, which I gave you a peek at in the last post, I decided to load the thing into the MS Word macro library.
My goal was to better understand the obfuscations: to play forensic analyst and experience the frustrations involved in this job. What I learned with this obfuscated VBA script is that only a very small part of it does any of the real work. Most of the rest is there to throw you off trail. The VBA code maintains a hex representation of the command line in a few variables and then translates it to a character string.
Do the same for 76 and you have obtain hex 6F. All it has to accomplish is getting past virus scanners searching for obvious keywords or their ascii representations. And this particular sample does this well enough. Finally, after the code builds the command line, it then launches it through the CreateProcess function below.Balaji actor wife
Think about it. A Word doc was sent in a phish mail to an employee. No binaries involved, and the heavily obfuscated scripts will evade scanners. To further my own education, I pulled out another macro from Hybrid Analytics below just to see what else is out there. This second one effectively does the same thing as the code above.
In my first series of post on obfuscationI showed that Windows Event logging captures enough details of PowerShell sessions — that is, if you enable the appropriate modules — to do a deep analysis after the fact. The better strategy is to spot unusual file access and application behaviors, and then respond by de-activating accounts or taking another breach response measure. Andy blogs about data privacy and security regulations.
Online VBScript Obfuscator/Defuscator (Encrypt/Protect VBS)
He also loves writing about malware threats and what it means for IT security. Malware Protection: Basics and Best Practices. Data SecurityThreat Detection. Top 5 Remote Work Security Threats. Choose a Session X.
De-obfuscating malicious Vbscripts
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What are some recommendations of tools that can obfuscate VBA code across forms, modules and class modules? I've done a bit of research and read up here in the archives but there hasn't been anything mentioned in a while so I thought those recommendations could be outdated. Also, please correct me if I'm wrong but from my understanding the simplified logic of a obfuscator is:.
Is that correct? What do I need to be looking into when selecting the 'defined logic'? I played around with CrunchCode before and there was a plethora of options but they were all foreign to me. I have bought CrunchCode and beware that it doesn't support bit systems. Support is really bad no email replies whatsoever over a few weeks. The string encryption feature will screw up all your string comparisons and MsgBoxes, as decrypted strings are not the same as the originals.
Recommend to avoid this product! My previous answer was poorly researched and as nobody else has replied I thought you deserved a better answer. Having tested CrunchCode, it appears that it obfuscates through the following techniques:.
The number one obfuscation technique is to strip out all semantics and reduce the likelihood that any context will be inferred. This was commonly a problem in the days of assembly code when it was very hard to tell what the code was going to do unless you were familiar with it. Overloading of operators through the use of User Defined Functions is a useful technique.Sanwa yx360trf manual
Out of 10 interviewees, I was the only one who guessed operator overloading, so this has always stuck with me.
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