Malware Analysis

by Anurag


SHA256 – 4221a9922d97fa329b3dbb27e37522448958cbfa186a6ef722e48d63f9753808 Download link – VirusTotal I downloaded this word document and checked whether macro present and it auto executes on opening document. Yes, it does and it has obfuscated strings too. I opened document and navigated to > Views > Macros > View Macros > Selected “autoopen” > Edit I renamed autoopen() to …

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SHA256 : 1043dd7647105b035acbc027e0fa448f329ea5620956a1ba82dc254fc7bd6e29 I have downloaded word document for analysis from VirusTotal I checked file with Oletools to verify macro exist and is it auto executable. In below screenshot, it can be seen, the macro is present and auto executable. I opened word document and Enabled Editing. Views > Macros > View Macros > Select …

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I came across this sample from one of Twitter post and immediately I downloaded this sample from virusbay.io  for analysis. First I used oleTools to analyse word macro. Macro will execute on opening file. It creates text file. It executes PowerShell command. it has base64 used to obfuscate the string. And it creates two bat …

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I downloaded this sample for malware analysis and change the extension to .LNK which is Microsoft Shortcut. Right clicked on file and navigated to shortcut and found that there is target is PowerShell embedded Below is PowerShell script which will drop another PowerShell script from the URL. URL is http[:]// timebounder[.]ru and downloading PowerShell script …

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I have downloaded this Microsoft shortcut malicious sample from Virustotal for analysis After downloading, I renamed as sample.lnk. (Microsoft shortcut extension .LNK) When I opened properties tab of this file, found below properties which clearly shows its now shortcut of any application but a PowerShell script which executed on opening. Target Type: Application Target: PowerShell …

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VirusTotal sample – c9bdfb2d6ac9e493bc391b2f64b48d8d5cde10645ea921951b23112e6d73545c File Type: Microsoft Word Document Document Property: I have used Oletools to analyse word document properties and analyse content. This word document has VBA macros. After parsing word document using olevba, this tells, file has suspicious hex string and Base64 strings. And file has below macros, LUDoB_BX.cls fkkkCAk.bas ZAAcAA.bas And macros …

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VirusTotal:  SHA256 – 9ff1c8e6d80ebf5626714362cbc55a53ba17038e841773d24fdc018891adb52e Tools used for analysis: Ollydbg, WireShark, PEExplorer, I started debugging using Ollydbg. The first warning I received is “Module ‘AutoRUN_’ has entry point outside the code (as specified in the PE header). Maybe this file is self-extracting or self-modifying. Please keep it in mind when setting breakpoints!” The executable file extracts HelpMe.exe file and …

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