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

Static analysis result for SHA-256 c03a727044ac5371…

MALICIOUS

Office (OLE) / .XLS

1.05 MB Created: 2010-07-05 00:57:59 Authoring application: Microsoft Excel
MD5: 89b9446d8b8bf083c8883d332100ff62 SHA-1: aa02746d3ab2ecbefb38875ac3503e2540fd60a5 SHA-256: c03a727044ac5371559ff6e0cd96ad521c9f0203d772b3240c9a9e125237ddde
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 macro malware. The document body contains what appears to be production data, likely a lure to disguise the malicious macro sheet. No scripts were extracted, but the presence of the macro sheet itself is sufficient evidence of malicious intent.

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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