Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5a8fc04457a7242c…

MALICIOUS

Office (OLE)

166.0 KB Created: 1996-12-17 01:32:42 Authoring application: Microsoft Excel First seen: 2015-09-17
MD5: 5e3f24b09c2aab3efe83cbf5e2f00300 SHA-1: 9f444dad5cfaf1f43dfeaf0ab4bdf7e8ec26338a SHA-256: 5a8fc04457a7242cc365f27fda06e77c264483b1f3b19280eddb5a625c51891a
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 and OLE_XLS_FORMULA_MACRO_VIRUS heuristics. These macros are known to be used for malicious purposes, with the heuristics specifically identifying it as a 'Classic.Poppy by VicodinES' and 'The Narkotic Network 1998' variant. The script attempts to infect other workbooks and save them as Book1.xls, suggesting a downloader or dropper functionality.

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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