Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 67c73f705d00828a…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: d19ba0382055917361ecc2273be9aade SHA-1: 762a7526cff9fa1dd0df89c0df3adf446c959bdd SHA-256: 67c73f705d00828a717dbb4b253d72765db6cb769b78e945c0516212c18d768e
160 Risk Score

Malware Insights

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

The critical heuristic 'OLE_VBA_PS' indicates a PowerShell reference within the VBA macros. This, along with 'OLE_VBA_CMD' and 'OLE_VBA_GETOBJ', suggests the VBA code is designed to execute external commands. The presence of a VBA project confirms macro usage. The script itself contains obfuscated Base64 decoding logic, further supporting the idea that it's preparing to execute a payload.

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
3be697ae20ad5bd8a91d8080e24579db489888ee7ea737f24eb9dbb15c99742d		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
7688327577a89d82f12fa4bc53ec3bf263a34191d48a88122026d55f131e7e1b		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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