Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 3967265275f78ffb…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: abeb01210e88c89eee665f8da234d4a6 SHA-1: 710ffb015748599802e83bab30f5e46f0997b261 SHA-256: 3967265275f78ffb757b67d4461d8d21425fccf791c132ae38c151f4786065b6
160 Risk Score

Malware Insights

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

This Office document contains VBA macros that reference cmd.exe and PowerShell. The presence of GetObject calls and the critical OLE_VBA_PS heuristic suggest the macros are designed to execute obfuscated commands, likely for downloading and running a secondary payload. The Decode64 function indicates potential Base64 encoded commands or data within the VBA script.

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
f6a80081a43b58d4462dbfe803453a01d58cade3d9fb6b8ab7011f2cced6834a		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
603dd78b2fad8601c20ea28a896dfae01b7fc3f163e61b1e057702e9fa69f5cb		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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