Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 ea06238e194a4f92…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 004e340e6d47c4dc6ee73e4d72332673 SHA-1: a2d14187293dff6679f46bf5c962ec43ca5f6f2c SHA-256: ea06238e194a4f92cf3e984879e71f32f863ed9dfd9b7e23ffed81d62cec3200
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

The OOXML file contains VBA macros that reference PowerShell and cmd.exe. The GetObject call and the presence of VBA macros suggest an attempt to execute arbitrary code. The VBA code itself appears to be heavily obfuscated, making it difficult to determine the exact payload, but the overall pattern indicates a downloader or initial execution stage for a malicious 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
9afc4563604bfee95db63fa03d35fd65509635ba76f7ba60557f62e7cd1be528		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
50b4cf32df63235ed5338012bc0d3f926a0b7f647a1db8a37114b9126d6fd39d		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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