Melissa — Office (OLE) / .EXE malware analysis

Static analysis result for SHA-256 0104b9ea63d0785b…

MALICIOUS

Office (OLE) / .EXE

37.5 KB Created: 2000-03-02 12:35:00 Authoring application: Microsoft Word 8.0
MD5: fc87cc40662f069d92a6c15dfea7447b SHA-1: 3e0eb202df320f20f889de95d37238c3280c83e2 SHA-256: 0104b9ea63d0785b40b4d8d60609cd9dc0bcb10dbd608bb1bce7a72aa53351ef
260 Risk Score

Malware Insights

Melissa · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1071.001 Web Protocol: Web Protocols T1059.003 Windows Command Shell

The critical ClamAV detections for 'Doc.Trojan.Melissa-23' and 'Doc.Trojan.Melissa-4' strongly indicate the Melissa family. The VBA macro's Document_Open subroutine, identified by OLE_VBA_PCODE_AUTOEXEC_EXEC, attempts to disable security warnings and then uses CreateObject to instantiate Outlook. The script then iterates through the Outlook address book, sending the current document as an attachment to the first 50 contacts found in each address list. The truncated script indicates it would attempt to send the email, confirming a mass-mailing worm behavior.

Heuristics 6

  • ClamAV: Doc.Trojan.Melissa-23 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Melissa-23
  • 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
05a0006a4a4b44dcfa74be3f0bf12080b1efee88962ceb76b7c6b57d194f05f8		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 12616 bytes
Detection
ClamAV: Doc.Trojan.Melissa-4
Obfuscation or payload: unlikely

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