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

Static analysis result for SHA-256 098f737039b2506f…

MALICIOUS

Office (OLE) / .XLS

54.0 KB Created: 2010-06-22 11:37:19 Authoring application: Microsoft Excel
MD5: 91261bc61736a597926f7efa718d9f59 SHA-1: 8620a769d96bd70c01cc33c821bfccb91ee274a4 SHA-256: 098f737039b2506fce819cad84a2af1857808cb2da28f632acd8c1cd2d64927b
80 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file contains legacy Excel 4.0 (XLM) macros, indicated by the OLE_XLM_AUTOOPEN heuristic. The DOC BODY text explicitly mentions 'Excel Formula Macro Virus (XF.Classic)' and 'Poppy by VicodinES', suggesting a self-propagating infection mechanism. The macro appears designed to infect other workbooks and save them as 'Book1.xls' in the XLSTART directory.

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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