Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 d78e6d7b9509479f…

MALICIOUS

Office (OOXML)

41.7 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 8f493a2e0514c40f71754780dc48cdf8 SHA-1: 33a83f136c2561adbc52826b152da4a66b3e398d SHA-256: d78e6d7b9509479f558209308fc38db46c148f70aee23a942ab75a85b4156db2
160 Risk Score

Malware Insights

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

The critical heuristic 'OLE_VBA_PS' indicates a PowerShell reference within the VBA macros, and 'OLE_VBA_CMD' shows a cmd.exe reference. The presence of a VBA project within the OOXML file confirms macro usage. The 'GetObject' call is also suspicious. These indicators suggest the macros are designed to execute commands, likely to download and run a secondary payload, which is a common attack pattern for malicious Office documents.

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
55889319c81a9b29beb3c485c89319dbd11463965372c08656fd2d2c6ab6f073		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
5043c2b65996e3c977c056950304190cdf94e63c18c99c356765723c1c06cad8		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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