Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 6e79437087f003f0…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: fe9ba1a617939a6cd3c843018c1a102b SHA-1: 94764c3ae0575e6651d5a84677b08c961d7384f3 SHA-256: 6e79437087f003f0153ec15928ddd151f0bf73af219ec22c4fae269ac2592362
160 Risk Score

Malware Insights

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

The OOXML document contains VBA macros that reference PowerShell and cmd.exe. The GetObject call and the presence of a VBA project suggest the macros are designed to execute arbitrary code. The Decode64 function indicates potential obfuscation, likely to download and execute a secondary payload. The primary IOCs are the embedded macro file and the VBA project file.

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
ae7fe76214ad5f4615faad2397b466b6c3b3483424876c6b3b4af475e5b2db1a		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
487d56701acc9ada73038bfa0c803a8637c84f0969c4266c8f4f4060945712fe		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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