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

Static analysis result for SHA-256 9916a6882b6190d5…

MALICIOUS

Office (OLE)

11.0 KB Created: 1998-03-22 16:27:00 Authoring application: Microsoft Word for Windows 95 First seen: 2012-06-14
MD5: 12e600f253830b99108db2fd76a34edb SHA-1: d1a7dd16326c001f0a5763ee9e5a9e3e221530b9 SHA-256: 9916a6882b6190d5a929eb99c2c8fa5c34f72106ab0494cca66440f3b5497d39
80 Risk Score

Malware Insights

Win.Trojan.Decaf-1 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic

The file contains a legacy WordBasic AutoOpen macro, a common technique for executing malicious code when a document is opened. ClamAV identified the sample as Win.Trojan.Decaf-1, indicating a known trojan. The macro's presence strongly suggests an attempt to compromise the user's system upon document interaction.

Heuristics 2

  • ClamAV: Win.Trojan.Decaf-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Decaf-1
  • 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.

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