Win.Trojan.Tristate-2 — Office (OLE) malware analysis

Static analysis result for SHA-256 c77e6c6328242c12…

MALICIOUS

Office (OLE)

37.0 KB Created: 2002-10-18 08:15:55 Authoring application: Microsoft Excel
MD5: eb13d03e199eba230865a7cb22673138 SHA-1: 883496d55ad22964cd0f0a0bbd69253efdce4757 SHA-256: c77e6c6328242c1211ee40968d967f15917c3ee95b677ba49b4bd3df8f6c781d
260 Risk Score

Malware Insights

Win.Trojan.Tristate-2 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1105 Ingress Tool Transfer

The file is identified as malicious by ClamAV with the signature Win.Trojan.Tristate-2. Static analysis detected VBA macros, including CreateObject and GetObject calls, and obfuscated strings. The embedded artifact 'macros.bas' likely contains code to download and execute a second-stage payload, as indicated by the heuristic 'VBA auto-exec with execution terms'. The document body content appears to be financial data, likely 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
adca8984bc4d9a54eab2dbb9d3cfdefcb3a27175d973fa41102bc02f56386542		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 9805 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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