Obfuscate word macro rust-obfuscator is a set of tools designed to automatically obfuscate Rust source code by inserting procedural macros or by (optionally) providing the obfuscation in the source code directly. Oct 20, 2020 · Obfuscate Empire stager vba file and generate a MS Word document: macro_pack. This is the reason why we are protecting our valuable VBA code with 5 layers of security. Although obfuscation is related to malicious code detection, little research has been conducted on obfuscation with regards to Visual Basic for Sep 20, 2023 · Microsoft has implemented several measures to defend against macro viruses, including the use of the Antimalware Scan Interface (AMSI) and automatic macro blocking. docx template_file = r"C:\tmp\Vbad\Example\Template\template. Nevertheless, evidence shows that threat actors have found ways to bypass these mechanisms. exe -g -s fake. These malicious documents come in the form of macro-enabled Microsoft Word Documents that are delivered through phishing vectors, and often… Hey, I am trying to create a malicious Word file that will open a meterpreter shell when executed and macros enabled. Contents of the Word document as revealed by oledump. VBA obfuscation is the art of making your VBA code unreadable but still functional. 1. Now let’s list the entries of the malicious document. zip file containing one or more . This post provides details of the obfuscation methods used in the VBA macro and the PowerShell script contained within the Word documents. press ALT+F11 to open the VBA editor. vba code into the ThisDocument macro and save the document; You can use EvilClippy to stomp the vba code like this: EvilClippy. Usually a macro consists of a series of commands and actions written in a dedicated Macro Language or a standard programming language. 3. txt" #The path to the file that contains a list of different filenames you want to use for your generated files path_gen_files = r"C:\tmp\Vbad Final year school project, obfuscate Word macros. In this case, the objective is Microsoft VBA, typically used ViperMonkey is a VBA Emulation engine written in Python, designed to analyze and deobfuscate malicious VBA Macros contained in Microsoft Office files (Word, Excel, PowerPoint, Publisher, etc). - ch4meleon/vba_obfuscator 7) Obfuscation with noise injection A popular obfuscation technique, in particular with data and service requests, is the addition of random noise. 1 Concepts. e. 5 days ago · DOCM - VBA Spawning via svchost. However, Microsoft has introduced the Antimalware Scan Interface (AMSI), which allows security products to integrate with the scripting engine within the Office applications to detect malicious macros dynamically. ) I tried hiding the malicious macro (created with Unicorn) by stomping the VBA code with EvilClippy Dec 18, 2018 · In part 1, we defined what code obfuscation is, what it could be used for, and we studied some code with a small amount of obfuscation. These commands will be executed automatically by the application when a certain trigger takes place. exe and store as dropped. docm obfuscation_technique Obfuscation technique to use buffer_collapse "File Buffer Collapse" - Macro's Local File Header embedded in compressed data section of another Local File Header ghost_file "Ghost File" - Local File Header for macro included without We're Under Maintenance. This video contains some basic information about VBS/VBA code execution methods/techniques as well as obfuscation techniques. Python script to obfuscate VBA (Virtual Basic for Applications) macros - BaptisteVeyssiere/vba-macro-obfuscator 2018 School project - PoC of malware code obfuscation in Word macros - bonnetn/vba-obfuscator Excelide obfuscates VBA code by replacing the variables, removing comments/indentations and replacing text with ASCII characters. If the output does not look credible or the resulting Google search is partially successful, then click the button or press Enter again. 2018 School project - PoC of malware code obfuscation in Word macros - bonnetn/vba-obfuscator Jun 15, 2024 · VBA Obfuscator 是一个开源项目，专注于保护Microsoft Word宏中的Visual Basic代码不被反病毒软件检测到。作为一个毕业设计项目，它通过应用一系列的代码变换，使得宏代码在扫描中更难以被识别，从而达到规避签名扫描的目的。 Jul 2, 2024 · Macro-based Office files have been extensively used as infection vectors to embed malware. This program obfuscates the Visual Basic code from Microsoft Word macros. Also creates a key, value pair for each variable changed in a separate text file that can be encrypted more easily individually with SHA-256. So I'd rather skip it. AMSIBypass_AmsiScanBuffer_Classic. Word, Excel), to detect VBA Macros, extract their source code in clear text, and detect security-related patterns such as auto-executable macros, suspicious VBA keywords used by malware, anti-sandboxing and anti-virtualization techniques, and potential IOCs (IP addresses, URLs, executable filenames, etc). Although VBA doesn’t have built-in obfuscation tools, third-party tools like VBA Compiler for Excel or Smart Indenter can help achieve this. docm), or a . exe) Dec 3, 2024 · Hello everyone today I will show a method to obfuscate vba macros to make office files for phishing that evade Microsoft Defender. vb to obfuscate) and the obfuscation password. Click OK, and then close the VBA editor. We can use the Oledump tool to see which entry has these macros. For more fine-grained obfuscation a procedural macro library cryptify is also provided. On the Tools menu, select Properties… On the Protection tab, select the Lock project for viewing check box. Jan 9, 2020 · 1. Let’s take a look at our analysis and how VMRay’s Function […] VBA Obfuscation Plus 4 More Layers of Security Microsoft Excel's VBA password protection is very weak, there are plenty of tools out there that can retrieve/crack the password. We focus on MS-OVBAs in Microsoft Office 97 documents that use the CFBF file format, instead of the modern Open Office XML (OOXML) format used by Microsoft Excel “. Some obfuscation techniques are dependent of the object to obfuscate. \nYou can dispose of the first two lines once it has been executed once on the Word document. May 7, 2021 · the LOG entry macro execution; obfuscation of code in the VBA project; to give you detailed statistics on the project (the number of lines of code, procedures Feb 4, 2025 · Code obfuscation maintains the functionality of your VBA code while making it challenging to read or comprehend. docm Generate an MS Excel file containing an obfuscated dropper (download payload. vba -r Doc1. Our website is currently undergoing scheduled maintenance. Notice the highlighted Jan 17, 2025 · Macros are special-purpose programs used to automate procedures within a bigger application or software. We know from Oleid that there are VBA macros in this document. Noise can be added in VBA projects as fake comments, procedures or even entire modules in order to create a significant level of confusion for the aspiring hacker. It modifies your existing macros with multiple levels of obfuscation which makes it difficult to understand the underlying logic. Combined with a little social engineering, this can be a very effective technique. doc" # The path to the template Office document you want to use to generate your files filename_list = r"C:\tmp\Vbad\Example\Lists\filename_list. Then VBA code has to be in one of the entries. vba: rasta-mouse's classic AmsiScanBuffer patch: AMSIBypass_Heap. vba: Load DLL via COM Hijacking: COM_Process_create. Jan 24, 2016 · When performing something such as a mass mailer attack on a company, sending executables usually isn't the best option. ⚠️ Pay attention to the first two lines! \n. Obfuscate the code Create DLL For 1, People can easily remove passwords from password protected macro and password protected excel files by watching some Youtube videos. I’ll use a Windows VM with python and office installed to Nov 18, 2020 · Before diving into VBA Purging, it is important to understand certain components of Microsoft’s specifications on VBA macros (MS-OVBA). Jul 27, 2020 · Code Protection (Free VBA Obfuscator) vba-obfuscator; Obfu-VBA; Also, you may protect your VBA macro with a password. exe -d word -f Doc1. As a result, phishing emails continue to utilize malicious macros as their primary attack method. Các Macros được viết bằng ngôn ngữ VBA (Visual Basic for Applications), ngôn ngữ này có đầy đủ tính năng cho phép truy cập sâu vào hệ thống. md at master · bonnetn/vba-obfuscator Sep 20, 2023 · Microsoft has implemented several measures to defend against macro viruses, including the use of the Antimalware Scan Interface (AMSI) and automatic macro blocking. Modules cannot be edited from VBA project browser 3. Although obfuscation is related to malicious code detection, little research has been conducted on obfuscation with regards to Visual Basic for Jun 1, 2022 · The proposed word embedding technique, called Obfuscated-Word2vec is proposed to detect obfuscated keywords, Obfuscated function names from the macro code and classify them as obfuscated or benign function calls which are later used as feature vectors to train models to extract the most relevant features from macro code and even to help the Obfu-VBA; Also, please correct me if I'm wrong but from my understanding the simplified logic of a obfuscator is: Scramble the VBA code by using a defined logic (change X to Y) The tool creates a new workbook where the VBA code is all scrambled, but everything else remains the same. In this paper, we analyze 77 obfuscation Une solution efficace pour protéger un code VBA est l'obfuscation (qui permet de rendre votre code VBA "illisible" tout en restant fonctionnel). ⚠️ It is necessary to add a document variable to the word document before pasting the code. Jun 28, 2018 · Malware using document files as an attack vector has continued to increase and now constitutes a large portion of phishing attacks. Olefile can list entries in the file. \n. doc -m ThisDocument Jul 7, 2023 · That information tells us that the file is MS Word 97-2003 type. Again we turn to the Microsoft Word VBA documentation. xlsx” and Microsoft Word “. Disabling Macro Settings for Unauthorized Users Jan 5, 2021 · Upon first look, these files seem to only list random words (see Extracted VBA code below). The input is the VBA file in clear with the source code program (file type . org will prompt for selecting one. You can play back whenever needed. Sep 12, 2018 · Macros are popular among attackers because of the rich capabilities that the VBA runtime exposes and the privileged context in which macros execute. Substitutes all variables declared for obfuscated values. Contents. 8) Obfuscation of UserForm controls Create an office document, click View -> Macros -> Create; Paste de fake. Also, the syntax of the language must be taken in account when obfuscating. It adds little friction to assignments. The transformations applied on the code allows the macros to evade signature scans from Antivirus softwares. Ce procédé consiste à supprimer les lignes vides et commentaires et à remplacer les noms des variables, des procédures et des fonctions par des noms aléatoires pour rendre le code VBA de votre Nov 21, 2021 · #2 Use VBA Obfuscation to Protect Your Macro Code. Is there a secure way to store that password in the VBA project ? Anyone who knows how to search a bit would find a code to crack that VBA project password and be able to read it. EDIT : I have thought of computing a new password each time the file is open by adding some randomness in it. exe -f empire. Unfortunately this protection is limited and can be bypassed by an aware user. Sep 13, 2021 · String Obfuscation. L'obfuscation VBA 2. VBA Obfuscator which I used for obfuscating vba codes to embed into Microsoft Word document while I'm doing some signature bypass testing in my work. Unfortunately it instantly gets detected by major Antivirus companies (McAffee, Malwarebytes, Windows Defender etc. VBA obfuscator for module files to increase security of VBA modules. To avoid anti-virus detection, malware writers usually implement obfuscation techniques in their source code. Introduction; Deobfuscating the VBA Macro; Deobfuscating the PowerShell script 2. If no VBA file path is provided, obfuscat. vba Dec 24, 2020 · Can be a macro-embedded Word doc (. vba: rmdavy's HeapsOfFun repo copy: AMSIbypasses. An interpreted language as Visual Basic is very different of a compiled executable code, as C or Assembler. txt next to the saved document. This is where the de-obfuscation and reverse engineering process starts. Swift macros for string obfuscation to protect sensitive data from binary analysis. Today we analyze a multi-tiered obfuscated VBA macro that includes VBA, WMI Objects, Powershell, Inlined C#, and an AMSI bypass. This command will obfuscate the whole code. vba: Create process via COM object: Download_Autostart. We can create a malicious macro using MS Word which leads to create a doc file contain our malicious code, if any user open that doc file the payload triggred and attacker gets a reverse shell. vba: outflanknl's AMSI bypass blog: COMHijack_DLL_Load. The output are two files, in the same folder and with the same name than the VBA file in clear (xxxxxxxx. Notably, as with all scripting languages, attackers have another advantage: they can hide malicious code through obfuscation. Sep 1, 2017 · We analyzed a recent wave of phishing mails trying to spread the Emotet banking trojan via malicious Word documents. It can be triggered by a shortcut key, toolbar button, or directly from the Developer tab. I bought a VBA protection tool but installer contained a trojan. Then all paths in the macros will be relative to that saved file, so you should find result. Enter and confirm a password. The following strings in our VBA will draw a lot of attention from any anti-malware engine because they use a WMI Object to Spawn a PowerShell process from VBA. An effective solution to protect VBA code is obfuscation, in other words, the solution is to make your VBA code "unreadable" (but still operational). See the article " Using VBA Emulation to Analyze Obfuscated Macros ", for real-life examples of malware deobfucation with ViperMonkey. The site also contains information about how to bypass MS Excel 2016 password protections by HEX editing. VBA Macros remain one of the most prevalent attack vectors to this date. Nov 12, 2018 · The biggest advantage is that when your new file is flagged, there only flagging the obfuscated file, not the original file used to obfuscate, in many cases they won't pick up on a section of VBA that's covered in the original, i. In this paper, we analyze 77 obfuscation Nov 21, 2021 · #2 Use VBA Obfuscation to Protect Your Macro Code. “M” or “m” indicate the presence of a macro Extracted VBA code from object 11 “VBA/omvLL”. Phishing is the best way to send someone a malicious document. Dựa vào khả năng này, kẻ tấn công sẽ xây dựng các đoạn mã lệnh nhằm mục đích đơn Jul 11, 2016 · We recently came across an interesting malicious Word document that used an embedded Word macro to detect whether or not it was being opened inside a VM. The VBA project is also protected by this password. . We'll be back online shortly. In particular, VBA macros allow leveraging kernel functions and system routines to execute or remotely drop malicious payloads, and they are typically heavily obfuscated to make static analysis unfeasible. Obfuscation adds friction to cheating in online tests because time is a factor. So next, we’ll cover another custom obfuscation technique used to encrypt any static strings within the VBA macro. exe using Scheduled Task DOCM - WMI COM functions DOCM/XLM - Macro Pack - Macro and DDE DOCM - BadAssMacros DOCM - CACTUSTORCH VBA Module DOCM - MMG with Custom DL + Exec DOCM - ActiveX-based (InkPicture control, Painted event) Autorun macro VBA Obfuscation VBA Purging The problem is that most obfuscation tools are really malware deployment tools. docm) in Save as type. That's why, in this tutorial, I'll be teaching you how to code a VBA script macro into a Word document in order to compromise a system. When saving the file you need to explicitly say it is a document with macros enabled, or else it won't save the macros with the document. only the file that was flagged will be detected, all other users are not affected. L'accès au code source étant trivial, il faut que celui-ci devienne compliqué à comprendre, et surtout qu'il implémente diverses fonctions qui tromperont celui qui essaie de l'analyser. Ultimate obfuscation 2. Kết hợp Macro với PowerShell hoặc các LOLBins. The Shell call is defined as follows: To protect VBA code, you can add a password right from the editor to prevent access to VBA code. doc; You can use OfficePurge to purge P-code from module streams: OfficePurge. Overview ObfuscateMacro transforms your strings at compile-time into obfuscated data, with runtime decoding when accessed. What can I do to prevent the client from tampering with the code? Aug 4, 2020 · VBA “stomping,” and obfuscation in general, can make it nearly impossible to detect malicious macros using static analysis. Introduction to OffensiveVBA - Obfuscate or just press Enter Randomness is introduced with each obfuscation. Feb 21, 2022 · Valak is a form of malware discovered back in late 2019. Macros are recorded sequences of instructions and actions written in VBA (Visual Basic for Applications) that automate tasks in Word. Do this simply by selecting Word Macro-Enabled Document (*. vb), but ending as: Jan 8, 2019 · This obfuscation again builds off of VBA ‘s interpretation of uninitialized variables. Now that we have covered the basics, we are going to move on to serious things with a more concrete case that we encounter every day—that is, a WORD file with a macro! 2018 School project - PoC of malware code obfuscation in Word macros - vba-obfuscator/README. vba -o -G myDoc. Which makes sense, sell to developers who embed your malware and pass on to clients and users as a trust vector. Thanks for your patience and support. g. If no VM was detected, the macro proceeded to attempt to download a payload (executable) to infect the machine. Current state-of-the-art approaches focus on discriminating between malicious and benign Office Dec 3, 2019 · olevba is a script to parse OLE and OpenXML files such as MS Office documents (e. Les problématiques d'obfuscation d'un code VBA sont similaires à celles de tout code non compilé. For 2, Obfuscation code is only on variables name, sub names and UDF names, all the keywords and excel functions are remain the same. vxgyroznmvkhbrdtohtnkegfdhfjyetioevdksgqznleuicuiaph