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

Static analysis result for SHA-256 7c768e0f1c2f4d32…

MALICIOUS

Office (OLE) / .XLS

1.36 MB Created: 2009-12-09 05:00:30 Authoring application: Microsoft Excel
MD5: ea478d54bd71218bc8d530d74db0b3da SHA-1: 984ccc51af5152005831ae2e9edc00f458ebc4ae SHA-256: 7c768e0f1c2f4d323062d957a41fb6df1f51bac117622f4e2c80d61f3b06839c
80 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file is an Excel XLS document containing legacy Excel 4.0 (XLM) macros, indicated by the OLE_XLM_AUTOOPEN heuristic. The document body explicitly mentions 'Classic.Poppy by VicodinES', 'An Excel Formula Macro Virus (XF.Classic)', and '(C) The Narkotic Network 1998', suggesting a known, albeit old, macro virus. The presence of these elements strongly points to the execution of malicious code via the macro 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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