Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 a9bc5110a253b742…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 35212548ef1d0d8e97411eb1f37760aa SHA-1: 362e83ba6fd1b810d7037a406b6bec7b97bfdd6d SHA-256: a9bc5110a253b742a88cbed18283d7ac99cd73b7ab2ae62e0596e2903ff9a0dc
160 Risk Score

Malware Insights

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

This 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 URLs prevent a more 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
8b970431539bedefb4e91b5fe3ac05d082c3d3b63167caf6861e92e4b4db93ea		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
61a95af605c1be3c2edb60e9410902f4b2d06851c4db2b51384fc485b745cc7c		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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