Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 8414a942b1b212ce…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: cba5c2df58125d8c12a6b2923a51b76c SHA-1: cfa4e1aa19e068d1aca0c36f458e71e60af3df2d SHA-256: 8414a942b1b212ce30db8b0c6d8e6a243f40ab153b9974dc227fcbca32237a6f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The OOXML document contains VBA macros that reference PowerShell and cmd.exe, indicating an attempt to execute commands. The GetObject call is also suspicious in this context. The VBA code includes a Base64 decoding function, suggesting it may be used to decode and execute a payload, likely downloaded from a remote source.

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
9cc4859656c329cd25e4393db188d25ffb400eb9dcd1c3e029f4bc25ca13007c		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
2c9e693bcb69ae9743610a2c30adc7b52ecf395090e6f40fff9b3d3626c8861d		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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