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

Static analysis result for SHA-256 5825a76314faf378…

MALICIOUS

Office (OLE)

11.0 KB Created: 1997-12-31 17:52:00 Authoring application: Microsoft Word for Windows 95 First seen: 2012-06-14
MD5: e6aef5966ed5c1b2834ebe7aa29924a7 SHA-1: ed8a7f9021fa61ddf8587f1d0a3c68db6a24d7cd SHA-256: 5825a76314faf3784be5174504710c4f0e6ebf5fa87e5ed69bbf0d5681b49f03
80 Risk Score

Malware Insights

Win.Trojan.Obay-1 · confidence 90%

MITRE ATT&CK
T1059.005 Visual Basic

The critical ClamAV heuristic identifies the sample as Win.Trojan.Obay-1. Legacy WordBasic macros were detected, specifically referencing 'FileSaveAs' and 'AutoOpen' as auto-execution markers. The macro code includes commands like 'DELTREE /Y C:\' which suggests an attempt to delete files or hinder analysis, alongside deceptive error messages.

Heuristics 2

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