Win.Trojan.Classic-1 — Office (OLE) malware analysis

Static analysis result for SHA-256 3538b7cb7495b3ee…

MALICIOUS

Office (OLE)

15.5 KB Created: 1998-09-10 23:36:45 Authoring application: Microsoft Excel First seen: 2012-06-14
MD5: bfde1b9da8f215f9be3ad0dce7c50a71 SHA-1: a0d213e8cecafa42b2a401c996988283c83b8ca4 SHA-256: 3538b7cb7495b3eef05013cbac4ce8b9771725e90604999f810d4e621565b33d
140 Risk Score

Malware Insights

Win.Trojan.Classic-1 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic

The file is identified as a legacy Excel Formula Macro Virus (XF.Classic) by multiple heuristics, including ClamAV. The document body explicitly mentions infecting other workbooks and saving them as Book1.xls, indicating a self-propagating mechanism. The presence of XLM macros suggests the use of Visual Basic for scripting.

Heuristics 3

  • ClamAV: Win.Trojan.Classic-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Classic-1
  • 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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