Win.Trojan.GreenBay-1 Office (OLE) malware analysis — malicious · 2e652eb2a8431e81

MALICIOUS

Office (OLE)

21.0 KB Created: 1993-09-28 15:08:00 Authoring application: Microsoft Word for Windows 95 First seen: 2012-06-14

MD5: 71798f2c137e0b35fced95635614eb13 SHA-1: 1c72451a3bbcbf6b28be96648655731b6fe58668 SHA-256: 2e652eb2a8431e81bdf2f202bdc7ac7cd1589f0aaebf973296149f56b3dc80a4

160 Risk Score

Malware Insights

Win.Trojan.GreenBay-1 · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic

The sample exhibits characteristics of legacy malware, specifically the presence of WordBasic auto-exec markers like 'AutoOpen'. Heuristics indicate suspicious OLE parsing issues and the detection by ClamAV as 'Win.Trojan.GreenBay-1' strongly suggests malicious intent. The embedded OLE object is the primary artifact of interest.

Heuristics 4

ClamAV: Win.Trojan.GreenBay-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.GreenBay-1
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	13056 bytes
SHA-256: `b06a35830fcedac8f705903baf1e7c74a60c4364b96a545188f14960dc9ced32`

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