Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 fdc6fd1ef5139132…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: ad399e0cfbff0eda4b527aa7e5a60cfd SHA-1: 39e345d4e1e7d8de45f84795c8429194328bc6c4 SHA-256: fdc6fd1ef5139132a58e1852ea6732a896166e1a17f25bbca1c08f63007662c7
160 Risk Score

Malware Insights

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

The sample is an Office document containing VBA macros. Heuristics indicate the macros reference cmd.exe and PowerShell, suggesting they are used to execute commands or download additional payloads. The GetObject call further supports the execution of external code. The presence of a Base64 decoding function within the VBA code implies obfuscation of 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
665f43184509209f34158631a2c8b35504429f0b9e37126959b5ace0fdd7811f		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
dea7518d1086adcdcb6d4b714e13789b0fc841a7f67e8f1dc82df3bdf13086a5		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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