Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 f7711de52bdcc476…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: f7d4125b48abd528d67cd478d975ce74 SHA-1: 91ec4c21341ab495c526cf969da14e647ad78a62 SHA-256: f7711de52bdcc476a4a026f85667b9ae243ad873ac3fbc5579531ebe28542a37
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 cmd.exe and PowerShell. The GetObject call and the presence of a Base64 decoding function suggest that the macro is designed to download and execute a secondary payload. The specific obfuscation and lack of clear indicators prevent definitive family attribution.

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
46368aec360ce200cf3d16657718a337a27a0a324a9abce85fb74694916f88b0		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
03eafea601cf1fef6d0192b835c2c6de3767478401627c735eb02a13dc976697		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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