Melissa — Office (OLE) malware analysis

Static analysis result for SHA-256 139a108166daf46e…

MALICIOUS

Office (OLE)

209.5 KB Created: 2001-06-18 16:17:00 Authoring application: Microsoft Word 8.0
MD5: 82611ed23e9a8805703bee6e5c8b4895 SHA-1: 1a1c238b79287ac772a272c71da8ade64152590b SHA-256: 139a108166daf46ea131503d545b746291dd5a8bf0483f60a381f09da3073a08
260 Risk Score

Malware Insights

Melissa · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1071.001 Web Protocols

The sample contains a VBA macro named 'Melissa' that is triggered by the Document_Open event. This macro attempts to use Outlook to email the document to recipients from the user's address book. The ClamAV detection of 'Win.Trojan.Melissa-4' strongly suggests this is a variant of the Melissa virus, known for its email-spreading capabilities.

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
d9b96e160d2fe61179057ebb96007cd4ea143b1f23dacc45a5bbb02fc859b67d		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3743 bytes
Detection
ClamAV: Doc.Trojan.Melissa-4
Obfuscation or payload: unlikely

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