Win.Trojan.Psycho-3 — Office (OLE) malware analysis

Static analysis result for SHA-256 696d1de8bd928379…

MALICIOUS

Office (OLE)

44.5 KB Created: 2001-05-07 18:39:00 Authoring application: Microsoft Word 8.0
MD5: eddd9b3c5fd0fd66f999e78c3343c345 SHA-1: f4afd642cd6a5b9d4f9c37aa32d7e4640d015a5c SHA-256: 696d1de8bd928379224b94bfa29bc88ffd97da1b5e01f17c95d4bbb4ae25cae4
260 Risk Score

Malware Insights

Win.Trojan.Psycho-3 · confidence 95%

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

The sample contains VBA macros, specifically a Document_Open macro that utilizes CreateObject to interact with Outlook. This macro attempts to harvest email addresses from the Outlook address book and send copies of the document to those contacts, disguised as an important message. This behavior is consistent with a phishing or malware distribution campaign, and the ClamAV detection names 'Win.Trojan.Psycho-3' and 'Doc.Trojan.Melissa-4' further support this assessment.

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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