Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 80bdf00c2940bd3c…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: a3a5424501f0d3d7b3ab806ca05e2de3 SHA-1: 49cf39f7d16776a96a7bade86192db9f065fff6a SHA-256: 80bdf00c2940bd3c75e54b53db1f6d6269db78efa8b599518b7d3b8831a651fb
160 Risk Score

Malware Insights

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

This OOXML document contains VBA macros that reference cmd.exe and PowerShell. The critical heuristic 'OLE_VBA_PS' indicates a direct PowerShell reference within the VBA code. The 'GetObject' and 'cmd.exe' references suggest the macro is designed to execute external commands, likely to download and run a secondary payload. The VBA code itself appears to be heavily obfuscated, making a precise determination of its actions difficult, but the overall pattern is 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
5f0caf2f82378709ac62a0e75e7d41bd4110d8f84f44faca8d2981ed28facf81		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
d0ae2adabcb603fa858d87bc3483e4c955e4029c1df889c300030e7e2dbb40fd		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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