Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 01003841bf324332…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 483108c0d5907eb5740d126a11282762 SHA-1: a8f5ac0088cbdfa08f3d6c88bafca517e2fe35ff SHA-256: 01003841bf3243321d7487c780c7e4c5ddcd9057e839c57f688c28075bfab664
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

The OOXML document contains VBA macros that reference cmd.exe and PowerShell. The GetObject call and the presence of a VBA project indicate macro execution is intended. The VBA code includes a Base64 decoding function, suggesting it's used to obfuscate or decode a payload. This points to a macro-based downloader designed to fetch and execute further malicious content.

Heuristics 4

  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
65370eaddfbaf0a4a9647bb7407263651992261d84dc88fd3f1c5fe9a800f56c		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
b79a765319a9c1c53d4907f29f3f3ad68d0aa55ad3d87bfae3df0532201c29d4		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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