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

Static analysis result for SHA-256 3320e6437e3fff2f…

MALICIOUS

Office (OLE) / .XLS

33.5 KB Created: 2010-08-04 08:21:03 Authoring application: Microsoft Excel
MD5: b77fbec918b3a887869b9544d5a29ddc SHA-1: 492b0370335a6db5f768c2c8f78f3cda3787171a SHA-256: 3320e6437e3fff2f741a2c605d98fcbf19d736c7615fd06e601c4d26c1cd52d0
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1059.001 PowerShell

The file is an Excel 4.0 macro-enabled spreadsheet containing an Auto_Open macro. Heuristics indicate the presence of a legacy Excel Formula Macro Virus, specifically mentioning 'Poppy by VicodinES' and 'The Narkotic Network'. The macro sheet contains references to 'Auto_Open' and 'RUN' functions, suggesting it's designed to execute arbitrary commands upon opening. The document body also contains text referencing 'Classic.Poppy by VicodinES' and 'The Narkotic Network 1998', further corroborating the identified malware.

Heuristics 4

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
617509d454b866ed1e60e56738543491015eb19689e52ac3d5f59b14efe57aaf		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 15424 bytes

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