Win.Trojan.Tristate — Office (OLE) / .DO malware analysis

Static analysis result for SHA-256 485b7358e7550f69…

MALICIOUS

Office (OLE) / .DO

107.0 KB Created: 2003-02-21 19:57:00 Authoring application: Microsoft Word 9.0
MD5: de8d8f235819d2f364abc933f1d6a616 SHA-1: f25594a79c6d708f29bc41084c82f198644d7231 SHA-256: 485b7358e7550f69ac01db2c7c4f8c0007f1f78c33e481a4e39d4154704f6614
260 Risk Score

Malware Insights

Win.Trojan.Tristate · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file contains VBA macros, indicated by the OLE_VBA_MACROS heuristic. Critical heuristics and ClamAV detections (Win.Trojan.Tristate-2 and Doc.Trojan.Tristate-1) strongly suggest a trojan payload. The extracted artifact 'macros.bas' likely contains obfuscated VBA code designed to execute a malicious payload, as suggested by the 'VBA Chr string obfuscation' and 'VBA auto-exec with execution terms' signals. The document body content appears to be unrelated technical text about welding, suggesting a lure.

Heuristics 6

  • ClamAV: Win.Trojan.Tristate-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Tristate-2
  • 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.
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • 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
dd5bf08a8a746fe7c35b6e4f371807dc0b644c7f39dffba3c4eab1b35339f2fe		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 9421 bytes
Detection
ClamAV: Doc.Trojan.Tristate-1
Obfuscation or payload: likely
Carved artifact contains 12 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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