Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 653be3e93470938a…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 7cd8faaf1ed1030c1f0cf59a8ec91f58 SHA-1: 43c2be32affc433bcb47224ed014553f8b2ef001 SHA-256: 653be3e93470938a50cc718645f7ebe3b1cb4d988434c0dd309fbde3a065f985
160 Risk Score

Malware Insights

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

The file is an OOXML document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject. The VBA macro itself appears to be a Base64 decoder, suggesting it's used to obfuscate a payload that is likely executed via PowerShell or cmd.exe. The primary purpose is to download and execute a secondary 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
d5d5b3242fca774ed2705991091d89feabc5c28ec72ab0fb975f9121b28883ab		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
623442789e083923e059df68b75f520bbd3433d32122119e0721d1fd06e0b70a		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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