Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8c123e4181fe6c29…

MALICIOUS

Office (OLE)

55.0 KB Created: 2008-12-04 16:22:00 Authoring application: Microsoft Word 10.0
MD5: cf941ccf2766daccde77aacfdb234e27 SHA-1: 1bda80c78776fb4b0b97cc78b2aa252b2372e695 SHA-256: 8c123e4181fe6c29bd06b1f6f786a8969b03bcc86b78865849dad7961c3c0f24
300 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

The file is an Office document containing VBA macros, specifically triggering a Document_Open auto-execution macro. Heuristics indicate the use of CreateObject and p-code execution, suggesting the macro is designed to perform malicious actions. The ClamAV detections 'Win.Trojan.Psycho-3' and 'Doc.Trojan.Melissa-1' further confirm its malicious nature. The document body, presented as an enrollment announcement, serves as a lure to trick users into enabling the macros.

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
48209df0eb27562f23f3d995c5f6cc61c199addb164c2b9f48f290e166a12b5c		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 8886 bytes
Detection
ClamAV: Doc.Trojan.Melissa-1
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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