Win.Trojan.Laroux-9 — Office (OLE) malware analysis

Static analysis result for SHA-256 d67c4f58b7152053…

MALICIOUS

Office (OLE)

28.5 KB Authoring application: Microsoft Excel First seen: 2012-06-14
MD5: 320bcf49a7ecf3470b9c24d2a9cd8bfc SHA-1: 5a6c4f2a3d20112325a935b793ee244d01998fbe SHA-256: d67c4f58b71520534e525de4fb6df33ca959dafa8de69bcd25697f31851f4249
262 Risk Score

Malware Insights

Win.Trojan.Laroux-9 · confidence 95%

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

The file is identified as a macro virus, specifically Win.Trojan.Laroux-9, by multiple heuristics and ClamAV. Although VBA extraction failed due to an unsupported format, the presence of macro virus markers and the embedded artifact strongly indicate malicious intent. The macro likely attempts to execute arbitrary code upon opening, consistent with a spearphishing attachment.

Heuristics 5

  • ClamAV: Win.Trojan.Laroux-9 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Laroux-9
  • 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_off00000867.ole embedded-office Embedded OLE/CFB Office body inside ole container at offset 0x867 27033 bytes
SHA-256: a1360c2084a3e56c759d821c1343b92d6b3b85c63565f36dde33c2ce761ce05c
Detection
ClamAV: Win.Trojan.Laroux-9
Obfuscation or payload: unlikely

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