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

Static analysis result for SHA-256 8b4d1b6e29b0377f…

MALICIOUS

Office (OLE) / .XLS

49.0 KB Created: 2002-04-15 03:08:32 Authoring application: Microsoft Excel
MD5: 8335b54c9f71fcd97cedd99508346f3a SHA-1: 5016b745ff9e2da94d4cd0a8d1a15c05af2dd957 SHA-256: 8b4d1b6e29b0377f9752d76d17087d4fefadc99b04c9a44dc9859b1826745f22
80 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel 4.0 (XLM) macro sheet, identified by the 'OLE_XLM_AUTOOPEN' and 'OLE_XLS_FORMULA_MACRO_VIRUS' heuristics. The embedded script explicitly mentions 'Classic.Poppy by VicodinES', 'Excel Formula Macro Virus (XF.Classic)', and 'The Narkotic Network 1998', indicating it's a known legacy macro virus. The script's intent is to infect other workbooks, 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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