Win.Trojan.Truko-12 — RTF malware analysis

Static analysis result for SHA-256 b9b66b1c29f24e19…

MALICIOUS

RTF

556.5 KB Authoring application: Msftedit 5.41.15.1515
MD5: 29984ce868b6ecc0b2b716673725a561 SHA-1: f8db9381f475cfa8d9255acaed565ceb8d8ce2ba SHA-256: b9b66b1c29f24e197578febc55ce71a3fb42aa16929a30c07a9ddc7fe3d9e3a4
260 Risk Score

Malware Insights

Win.Trojan.Truko-12 · confidence 95%

MITRE ATT&CK
T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model Hijacking

The RTF file contains an embedded OLE object which itself contains a PE header, a common technique for delivering malicious executables. ClamAV signatures identify the embedded artifact as Win.Trojan.Truko-12. The presence of OLE object data and a package object class strongly suggests this is a dropper or downloader.

Heuristics 6

  • PE header (with DOS stub) in hex data critical RTF_MZ_HEX
    Hex-encoded PE (MZ + DOS stub) found inside RTF — likely an embedded executable payload
  • ClamAV: Win.Trojan.Truko-12 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Truko-12
  • 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.
  • Package object class high RTF_OBJCLASS_PACKAGE
    OLE Package object — can wrap arbitrary files
  • OLE object data medium RTF_OBJDATA
    RTF contains 1 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000000d1.bin
bc8007964aa326344656828a5596d91f409366562eb055374627f2ebe570f054		 rtf-objdata-decoded RTF \objdata at offset 0xD1 277420 bytes
Detection
ClamAV: Win.Trojan.Truko-12
Obfuscation or payload: unlikely

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