Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 2ad16ee5370e697c…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 90f6331dc8fec85b99e44a351d3cf7d1 SHA-1: 9c8c3292b80828f2e63e2f53d1d90429fde6bdd2 SHA-256: 2ad16ee5370e697ca06e3ed9cb919fa407d2b126b6939b10f087eb5f9264f2d0
160 Risk Score

Malware Insights

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

The file is an OOXML document containing VBA macros. Heuristics indicate the presence of PowerShell and cmd.exe references within the VBA code, suggesting an attempt to execute external commands. The VBA code itself appears to be heavily obfuscated, making it difficult to determine the exact payload, but the overall pattern points to 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
b8ea4e269df13bd897c8fa3437f4f34915464c647f06703d2d9b65226cfa8555		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
bfce47b21c7ec53893e45dd354f9dc6d02c6a204975b9a7ce0cbc37dfdeb0c2d		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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