Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 ab5457850b2f5057…

MALICIOUS

Office (OLE) / .XLS

1.48 MB Created: 2009-01-02 16:06:10 Authoring application: Microsoft Excel
MD5: 3e6e0a3479f0ab9ea675b6e6cbe7699c SHA-1: 9695135ff4b05b7bcb97f0832801c4e957a52ed1 SHA-256: ab5457850b2f50573bd3ee39551fcad6c95422544a824a33d9601afb7b2c58fc
80 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications

The critical heuristic firing for 'OLE_XLS_FORMULA_MACRO_VIRUS' and the medium firing for 'OLE_XLM_AUTOOPEN' indicate the presence of legacy Excel macros. These macros are known to be used for delivering malware. The document body contains what appears to be a parts list for steel, which is likely a lure to disguise the malicious macro functionality. No specific IOCs were extracted, and the family is unknown due to the generic nature of the macro.

Heuristics 2

  • Legacy Excel formula macro virus marker critical OLE_XLS_FORMULA_MACRO_VIRUS
    Workbook stream contains self-identifying legacy Excel formula macro virus markers. This indicates the document carries formula macro virus content even when no VBA project or modern XLM macro-sheet structure is present.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

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