Win.Trojan.Laroux-11 — Office (OLE) malware analysis

Static analysis result for SHA-256 be22980ca811eaca…

MALICIOUS

Office (OLE)

30.5 KB Authoring application: Microsoft Excel First seen: 2012-06-14
MD5: dd173a3c9aa630252c6eff59073f875d SHA-1: 609fd704c2872447886d1f42ea43a24aa9a5a281 SHA-256: be22980ca811eacabff78ef700aa34545ca2b6e0054e9ba1a922cacc86ddb1f6
262 Risk Score

Malware Insights

Win.Trojan.Laroux-11 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic

The file is identified as a malicious Excel 5 document by multiple critical heuristics, including specific detection of the Laroux macro virus (Win.Trojan.Laroux-11). Although VBA extraction failed due to an unsupported format, the presence of Laroux markers and ClamAV detection strongly indicates malicious intent. The document body contains what appears to be travel expense data, likely a lure to disguise the malicious macro.

Heuristics 5

  • ClamAV: Win.Trojan.Laroux-11 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Laroux-11
  • Excel 5 Laroux/Larou-CV macro-virus marker cluster critical OLE_XLS5_LAROUX_MACRO_VIRUS
    Legacy Excel workbook contains a Laroux/Larou-CV macro-virus marker cluster including auto_open execution and workbook/module replication strings. This is a narrow indicator for an infected legacy Excel macro workbook.
  • Embedded Office document has suspicious static findings critical EMBEDDED_OFFICE_CHILD_STATIC_TRIAGE
    A CFB/OLE Office document was found inside another file type and its carved contents matched Office exploit or payload heuristics. This catches wrapped exploit documents where the top-level file routes to a PE, archive, or generic scanner instead of Office.
  • CFB header with no readable streams medium OLE_PARSE_EMPTY_STREAMS
    The file begins with a valid OLE2/CFB header but exposes no directory streams. A non-empty compound document with an unreadable directory is anomalous — it is seen with truncated/corrupt files and, more importantly, with content deliberately shifted off byte boundaries to defeat parsers while the host application still recovers the object.
  • Unsupported Office format for VBA extraction info OFFICE_FORMAT_UNSUPPORTED
    olevba could not extract VBA macros (AttributeError); format-agnostic byte-level scans still ran. Likely legacy, encrypted, or malformed OLE/OOXML — re-scanning the same bytes will yield the same outcome.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_office_off0000086a.ole embedded-office Embedded OLE/CFB Office body inside ole container at offset 0x86A 29078 bytes
SHA-256: c4a77b16bc0e1a1ef016705c0998355e53bdd93692fd1063494b9cc94541bb1e
Detection
ClamAV: Win.Trojan.Laroux-11
Obfuscation or payload: unlikely

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