I have a malware to analyze with md5sum - 000cbfb28e750f2e321551c03e4fe488 When I run the command on linux : file {malware-file-name} it shows : Composite Document File V2 Document, Little Endian, Os: Windows, Version 6.3, MSI Installer, Last Printed: Fri Dec 11 11:47:44 2009, Create Time/Date: Fri Dec 11 11:47:44 2009, Last Saved Time/Date: Fri Dec 11 11:47:44 2009, Security: 0, Code page: 1252, Revision Number: {2FA78889-1A12-4B8C-93FE-9F1F2A6C1FFB}, Number of Words: 10, Subject: ekFW6uNGmArL5v7g, Author: ekFW6uNGmArL5v7g, Name of Creating Application: Advanced Installer 14.8 build 281f49a4fb, Template: ;1033, Comments: This installer database contains the logic and data required to install ekFW6uNGmArL5v7g., Title: Installation Database, Keywords: Installer, MSI, Database, Number of Pages: 200

How do I go about disassembling it and understanding what is this malware doing? br> I tried opening it on IDA. But the function names are all random that doesn't give any hint on what this is doing. Any hints/ideas/tools how to proceed ?

  • MSI databases technically are that format. You could use a tool like Orca (from the Windows SDK) or 7-Zip to extract contents of tables and data (e.g. CAB streams). The WiX toolset also has tools to decompose existing MSI files. Now, since you claim this is malware, I suggest you proceed with caution and do this inside a VM or so. However, since MSIs aren't themselves executable (however: vulnerabilities and exploits may exist!) you needn't be afraid something runs unless you use msiexec or its API counterparts to send this database to the Windows Installer. – 0xC0000022L Mar 4 at 11:11

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