Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 7391377b02b23342…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 052e5adac104bad94eaa50f70724bf44 SHA-1: 991617ec6ffd50c91aefdd56eebaa97047194529 SHA-256: 7391377b02b23342f3d6a60548cd844d5b99dc1c54dd1d4dbee9bf327e9d0a0f
160 Risk Score

Malware Insights

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

This OOXML document contains VBA macros that reference cmd.exe and PowerShell. The critical heuristic 'OLE_VBA_PS' indicates a PowerShell reference within the VBA, suggesting the macro is designed to execute external commands. The 'GetObject' and 'cmd.exe' references further support the likelihood of payload execution. The VBA code itself appears to be heavily obfuscated, making it difficult to determine the exact nature of the executed commands or the final payload without further dynamic analysis.

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
bf4786638a88e5795955970bb0f412ad0edb2155410e387555cb067b13b16a04		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
ae418cdb83f7de488dfbd398e66c65f33f2287316a10f29544d0a274e2284192		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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