Melissa — Office (OLE) / .DOC malware analysis

Static analysis result for SHA-256 6a72af05c123c1a5…

MALICIOUS

Office (OLE) / .DOC

31.5 KB Created: 1999-03-15 00:01:00 Authoring application: Microsoft Word 8.0
MD5: a9df25b213e6a3c0a5b5b2e55b16fcbc SHA-1: 888d9db0db834f432525bcfc1a133df10414eb92 SHA-256: 6a72af05c123c1a51b52a684a21b436317ebe31b85ebcc61274d43f195cab2e8
260 Risk Score

Malware Insights

Melissa · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample contains VBA macros, specifically a Document_Open macro that executes upon opening the document. This macro uses CreateObject to interact with Outlook, attempting to email copies of itself to contacts found in the Outlook address book. The ClamAV detections for 'Win.Trojan.Psycho-3' and 'Doc.Trojan.Melissa-4' strongly indicate this is the Melissa virus, which spreads via email attachments.

Heuristics 6

  • ClamAV: Win.Trojan.Psycho-3 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Psycho-3
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
b8c565991c8c6e3906197be85b30591e634be68119fe75dd285507c8a3b315a7		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 12767 bytes
Detection
ClamAV: Doc.Trojan.Melissa-4
Obfuscation or payload: unlikely

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