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

Heuristics 4

• 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.
• Legacy XLM macro-virus family marker critical OLE_XLM_LEGACY_MACRO_VIRUS
  Workbook contains an Excel 4.0 macro sheet and legacy macro-virus family or workbook-replication strings. This is a narrow indicator for infected XLM workbooks rather than ordinary formula use.
• Encrypted Excel 4.0 macro sheet high OLE_XLM_ENCRYPTED_MACROSHEET
  Workbook contains an Excel 4.0 macro sheet and BIFF FILEPASS encryption. Password-protected XLM macro sheets, especially the default Excel password path, are a common malware evasion pattern because static formula extraction may fail until the workbook is decrypted.
• 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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