Win.Trojan.GreenBay-1 — Office (OLE) malware analysis

Static analysis result for SHA-256 74c9d2ff206cdce4…

MALICIOUS

Office (OLE)

28.0 KB Created: 1993-09-28 15:08:00 Authoring application: Microsoft Word for Windows 95 First seen: 2012-06-14
MD5: e03c7f33ef7c5e93d2b191bcc870ed49 SHA-1: 25e46057ca54aadfb8d6876dd6f9ddabeaab6c9f SHA-256: 74c9d2ff206cdce41dc4c8f53b68e6215db860b555d95346ed49f8ae45acc8d3
260 Risk Score

Malware Insights

Win.Trojan.GreenBay-1 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic

The file exhibits characteristics of legacy malware, specifically the presence of a WordBasic AutoOpen macro, which is a known indicator for older malicious documents. The ClamAV detection of 'Win.Trojan.GreenBay-1' strongly suggests a malicious payload. The embedded OLE object, despite its content appearing benign, is flagged for suspicious static findings and structural anomalies, further supporting the malicious verdict.

Heuristics 5

  • 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.
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 20,224 bytes but its declared streams total only 0 bytes — 20,224 bytes (100%) live in unallocated sector slack. This is the canonical hiding place for pre-macro-era Office exploit payloads (XOR-encoded shellcode reached via a parser pointer-corruption bug in the document structure).
  • 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.

FilenameKindSourceSize
embedded_office_off00002100.ole embedded-office Embedded OLE/CFB Office body inside ole container at offset 0x2100 20224 bytes
SHA-256: 97fc92db12cc59de911d2170c25a31c611c13fb9f2bffd8d329298a762721dca
Detection
ClamAV: Win.Trojan.GreenBay-1
Obfuscation or payload: unlikely

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