Melissa — Office (OLE) malware analysis

Static analysis result for SHA-256 01f076168e6a006b…

MALICIOUS

Office (OLE)

38.5 KB Created: 2000-08-23 16:50:00 Authoring application: Microsoft Word 8.0
MD5: bc1e250e48de0c276d6280d9e6257dd8 SHA-1: b3eec5453af4d2cc52990f2c87b6c64fc509d9da SHA-256: 01f076168e6a006b2b27d8b9feeb396cd9c531c2b09ad4e55218e4defa439e8f
260 Risk Score

Malware Insights

Melissa · confidence 95%

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

The sample contains a VBA macro that executes upon opening the document, as indicated by the Document_Open and CreateObject firings. The macro attempts to interact with Outlook to send emails containing the document as an attachment to recipients from the user's address book. This behavior is characteristic of the Melissa virus, which spread via email using Microsoft Word macros.

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
8d0874ad77675fb587a3b1207b226c2c6b111512c18904b1f1dcaf63133f531c		 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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