Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 0671e1c9ca7be711…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 2184ecdfc34b15a8959b8ebb6aa5c4cb SHA-1: f0deb724df0d4568990ed04b3947f224c12e4160 SHA-256: 0671e1c9ca7be7110e6f763e265a7a52a29558e6a88b9f29f381240189c6c420
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 further suggests the potential for loading and executing external code. The VBA code includes a Base64 decoding function, likely used to obfuscate malicious commands or payloads.

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
1584715f0a2cd8f9b28c88e22f2b218b1c6172c656c22adeecca33fe03855eaa		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
d668fb80b78a0223d7fb710ddbd3e8eee431560e55bb69ace2d0bf9fd9ac020d		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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