Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 7342f1de506748f6…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: a076cbd1c3e403d474266c1399dfe20e SHA-1: 176b0fea7a18472eb94c3b5687223706a66b86e2 SHA-256: 7342f1de506748f6756794c6a8594f19dbfd8f98da67e150916a9eaec404627f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file is an Office document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject. The VBA macro appears to contain obfuscated Base64 decoding logic, suggesting it 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
c284bdabda4a80eaebd0735c5729e29aef7c03f08d7eead5faa39ad7c14f1f3c		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
67a619aca83c2bc6d7da9961d7cc687d594c8f8939ea6f186cc346b2537b2908		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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