Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 e72bd6b1d84c23b0…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 7464e8eba62b92bdbb471e00c6b78d00 SHA-1: 11bcef94ba42beb84fcf34f60af4bd0fbf7f86a5 SHA-256: e72bd6b1d84c23b0205e0cf410f0af023b28c9e6b4e0e539524b7507e6f4a971
160 Risk Score

Malware Insights

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

The file is an Office document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject, suggesting it's designed to execute external commands. The presence of a Decode64 function in the VBA macro indicates obfuscation, likely to hide a payload download or execution routine.

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
d0e0e34106c7f87eeecb1bd059110a3f609b51a9bf7daa81351c1e099979a173		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
c8058b090142b822dc8a6588df092cfc104e4a3e78fb5d4dad770f883d848e5a		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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