Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 6abac9e93f78962a…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: bf34e87ed2a4408d3be13ed1c484a57d SHA-1: 2cab4cb2d60a95ee5e79b94fe83f322653bb883b SHA-256: 6abac9e93f78962a92cababc0a4106e5b98b000c2a176f65ebfe6c459613eebe
160 Risk Score

Malware Insights

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

The file is an OOXML 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 VBA code 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
3f40a5513b4fd56c98badb637ac415593dac6c42de5031f10773c84e6d69e7c4		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
2c831b7edd73d4f8192c7d984e6858afce1170e0c651b951bb5c74aa89b30b2b		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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