Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 d4a600c6423b3d4f…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: c75a3d486e3cb5a51e8aae2cd0e36b07 SHA-1: 246c8f6dc25eea1a57f486ca270e0e785b7becb0 SHA-256: d4a600c6423b3d4f96004cb8614bedce1bd8810023eda01bef2f17376c08d737
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

The OOXML document contains VBA macros that reference PowerShell and cmd.exe. The presence of a GetObject call further suggests an attempt to execute external code. The macros appear to be obfuscated, but their intent is likely to download and execute a second-stage payload, consistent with a macro-based downloader.

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
05b94e3488d5d583b19cb440b0ad13419d02214bae4c93931f5094283ae46d59		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
6bdfbdaa4d3b05b59951fd4b8136dbba6004b5287018c2bc915d3904318fb9a9		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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