Win.Trojan.Thebman-2 Office (OLE) malware analysis — malicious · f372e590fd74d8b2

MALICIOUS

Office (OLE)

21.0 KB Created: 1993-09-28 15:08:00 Authoring application: Microsoft Word for Windows 95 First seen: 2015-09-17

MD5: 3b60494206b2c5808bba0f1e0ee9d5a2 SHA-1: 54e80e3f2bdc4a7190df8c5556584304d2d57a50 SHA-256: f372e590fd74d8b2f509faea56d8b1dd0c7fa84567bc620f8fc5feb2caaedf52

160 Risk Score

Malware Insights

Win.Trojan.Thebman-2 · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic

The presence of a legacy WordBasic auto-exec macro marker ('autoopen') and critical heuristics indicating suspicious embedded OLE objects strongly suggest malicious intent. ClamAV detection as 'Win.Trojan.Thebman-2' further supports this. The embedded OLE object is the primary indicator of a potential secondary payload or exploit.

Heuristics 4

ClamAV: Win.Trojan.Thebman-2 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Thebman-2
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.
Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC

OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_office_off00002100.ole`	embedded-office	Embedded OLE/CFB Office body inside ole container at offset 0x2100	13057 bytes
SHA-256: `8045a2b8f5b51526d9b6f969889090fc9be7150d0f2b45a410bbdeac8cb646c6`

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