Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 78397c59b706aa77…

MALICIOUS

Office (OLE)

31.5 KB Created: 2009-06-23 20:47:00 Authoring application: Microsoft Word 8.0
MD5: e1b1973b9d9b58260a65b08ab1f4479a SHA-1: ae21c5c540c7aa9bb566a7e958eb2406d86dbb74 SHA-256: 78397c59b706aa77b31f3a1d68038072e058bb385a2c09a0a6b4bb6336cf807f
260 Risk Score

Malware Insights

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

The sample contains VBA macros that execute automatically upon opening the document via the Document_Open subroutine. The script uses CreateObject to interact with Outlook, attempting to send the document as an attachment to contacts in the user's address book. This behavior is consistent with a phishing or spam distribution method, aiming to spread the malicious document further. The ClamAV detections (Win.Trojan.Psycho-3 and Doc.Trojan.Melissa-4) further support its malicious nature.

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
32255fde3c88c33d4ab48e35811f555f797307d4fb7433b0fd46aa4791817974		 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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