Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 71d7ca35a262c746…

MALICIOUS

Office (OLE)

4.52 MB Created: 1996-10-14 23:33:28 Authoring application: Microsoft Excel
MD5: 3af07c8ae631d9db9c769f1a66274820 SHA-1: c05465aa5f0b394653be6c73522fc87e316d3c36 SHA-256: 71d7ca35a262c746e11d474201606cf73d38c1584376a8d4d2cb117aec2923fa
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The sample is an Excel 4.0 (XLM) macro-enabled workbook. Heuristics indicate the presence of an Auto_Open macro designed to execute a payload or lure the user into enabling content. The document body displays a table of contents and product summary, a common tactic to disguise malicious macro execution. The embedded URLs, though confirmed benign, are associated with the Auto_Open heuristic, suggesting a potential download or execution vector.

Heuristics 4

  • XLM Auto_Open workbook with payload URL or enable-content lure critical OLE_XLM_AUTOOPEN_PAYLOAD_LURE
    Workbook contains an Excel 4.0 macro sheet with Auto_Open / Auto_Close and also exposes a payload URL or enable-content lure in the OLE bytes. This combination is a high-confidence XLM downloader/social-engineering pattern even when formula recovery cannot decode the full macro chain.
  • Excel 4.0 (XLM) Auto_Open + macro sheet critical OLE_XLM_AUTOOPEN
    Workbook contains an Auto_Open / Auto_Close defined name together with an Excel 4.0 macro sheet — the canonical XLM auto-execution shape used by malware families such as Emotet and QakBot.
  • Legacy XLM macro-virus family marker critical OLE_XLM_LEGACY_MACRO_VIRUS
    Workbook contains an Excel 4.0 macro Auto_Open chain and legacy macro-virus family strings. This is a narrow indicator for infected XLM workbooks rather than ordinary formula use.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://us.f145.mail.yahoo.com/ym/WINDOWS\TEMP\MEADJOHNSON.xls
    • http://us.f145.mail.yahoo.com/ym/WINDOWS\TEMP\BCW12M06-2002.xls
    • http://us.f145.mail.yahoo.com/ym/WINDOWS

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