Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2dbf80369adba6af…

MALICIOUS

Office (OLE)

41.5 KB Created: 1996-12-17 01:32:42 Authoring application: Microsoft Excel First seen: 2015-09-26
MD5: 5d9744ad57019c2f748b9cfc8eb46018 SHA-1: 4acfb00ded87bbd1334df90a916a7348dbe7f5c4 SHA-256: 2dbf80369adba6af12915377bd0c6936ca618c65465eea68d67a2941c95dafd1
80 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file is an Excel 4.0 macro sheet, indicated by the OLE_XLM_AUTOOPEN and OLE_XLS_FORMULA_MACRO_VIRUS heuristic firings. These macros are known for their malicious potential, with historical associations to viruses like 'Poppy' and 'Narkotic Network'. The presence of 'Book1.xls' suggests a potential attempt to infect or spread via Excel's startup directory.

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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