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

Static analysis result for SHA-256 e579c68b07652a05…

MALICIOUS

Office (OLE)

13.5 KB Created: 1999-03-26 18:51:00 Authoring application: Microsoft Word for Windows 95 First seen: 2012-06-14
MD5: 526fb7895159ecb334da7f11f02ee2fa SHA-1: e4ce760023ce486fd4455be89a42f790edf31de4 SHA-256: e579c68b07652a05217e8f79c5ce17e2a805ffaafb1831c49759180350bd8d58
80 Risk Score

Malware Insights

Win.Trojan.RegBomb-1 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic

The sample contains a legacy WordBasic macro triggered by 'AutoOpen'. This macro attempts to execute a command that formats the C drive, as indicated by the 'Win.Trojan.RegBomb-1' ClamAV detection and the embedded command 'format c: /u'. The presence of the legacy WordBasic marker and the specific detection name strongly suggest this is a destructive payload.

Heuristics 2

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