Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4086ae6444309e8d…

MALICIOUS

Office (OLE)

1.28 MB Created: 2000-05-26 16:45:09 Authoring application: Microsoft Excel First seen: 2015-10-01
MD5: a7e8eb03497d88af677f1d83dc346c70 SHA-1: 4b9eef76c6d2e34f6a26c4b07d5fe398d1eed0c5 SHA-256: 4086ae6444309e8dd79083ac6b2b089baab9fd227965fa69eb643d0b4113870f
80 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel file containing legacy Excel 4.0 (XLM) macros, indicated by the OLE_XLM_AUTOOPEN and OLE_XLS_FORMULA_MACRO_VIRUS heuristic firings. These macros are often used to download and execute further payloads or perform malicious actions. The document body text suggests a cost estimation or project management context, which is likely a lure. The presence of the string 'C:\DUTOAN97\CUOCVC.DBF' within the document body suggests a potential file path used by 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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