Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 d17ec641bbd31eb9…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: df525ddf140289653d99a46168658931 SHA-1: 8be5f3d3676543c079b6917b73d14abd27c1391d SHA-256: d17ec641bbd31eb933ec87a9827aa0c6a13bc2624ad87005718d9d700bb7fbe7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell 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, suggesting it's designed to execute arbitrary code. The VBA macro itself appears to be heavily obfuscated, but its presence and the associated heuristics strongly suggest a malicious downloader or dropper.

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
76d9e438f1cd89bc16f11ac1b411720f8246124364c85a43f14f6de866ede6f0		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
6c667a14d045ec71deb2dc00cb54f40dd7d734e7b82c2eecc31b0300e984ab9e		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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