Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 558448c03e23ec1d…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 5bf9e2730202b234fe8bade29bbc0232 SHA-1: d4435f3172c42bed31def078c9239b3f9e00087f SHA-256: 558448c03e23ec1df3bbbe433aa7bdd9b03145a98b99d89c15c7b33dfc555699
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell

The OOXML file contains VBA macros that reference PowerShell and cmd.exe. The GetObject call and the presence of a VBA project indicate malicious macro execution. The VBA code appears to be obfuscated, but its intent is likely to download and execute a secondary payload using PowerShell.

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
f32d8e412523ffba471090040d9828b9943857b5034cae94862bd8d730290798		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
80d08eb23041ea20c2d486a60058d92f49997119d3e08cf2ec78bb131fb3c98e		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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