Doc.Trojan.Melissa-23 — Office (OLE) malware analysis

Static analysis result for SHA-256 5dbf02b1d4c38977…

MALICIOUS

Office (OLE)

34.0 KB Created: 2005-03-31 22:52:00 Authoring application: Microsoft Word 10.0
MD5: 7e3823faf6e0ad6b8a99d65f8892b2dd SHA-1: 607cf573ac451cccedee40eacba904474d09ed20 SHA-256: 5dbf02b1d4c38977f7f4ccda9aeb7b5bebb22759558dcc060f2d7f07e840d524
260 Risk Score

Malware Insights

Doc.Trojan.Melissa-23 · confidence 95%

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

The sample contains VBA macros that execute upon opening the document, as indicated by the Document_Open and CreateObject firings. The script attempts to disable macro security settings and leverage Outlook to send itself to contacts, a common characteristic of the Melissa family. The ClamAV detections further support this classification.

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
1a58e515a4675ec6b0d8c5666e158b98a782e6a2fcc36cd2405847933fac9d9f		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3421 bytes
Detection
ClamAV: Doc.Trojan.Melissa-15
Obfuscation or payload: unlikely

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