Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 be680a8044e69d54…

MALICIOUS

Office (OLE)

92.0 KB Created: 2009-09-03 19:16:00 Authoring application: Microsoft Word 11.5.0
MD5: 7a8dceec3b04488ea7da4deeb2f986d4 SHA-1: 922abde2d50476788f10d567e051f98b5d32f73b SHA-256: be680a8044e69d54b3d8bd0c488c5cb05d73ec7fc93a3e3272cbca73c636b453
300 Risk Score

Malware Insights

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

The sample is an Office document containing VBA macros, specifically a Document_Open macro that uses CreateObject, indicating an attempt to execute code upon opening. The ClamAV detection as 'Win.Trojan.Psycho-3' and 'Doc.Trojan.Melissa-4' on an extracted artifact strongly suggests malicious intent. The document body presents a fake educational assignment to likely trick the user into enabling macros, which would then trigger the malicious VBA code.

Heuristics 7

  • 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.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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