Win.Trojan.Delf-10 — RTF malware analysis

Static analysis result for SHA-256 2127f4e08967294a…

MALICIOUS

RTF

543.7 KB Authoring application: Msftedit 5.41.15.1515
MD5: 575d7521cba45502ae6a8829a20e2378 SHA-1: 66b480dadf121aa0c5e547ce3a8e8da9c8e9033b SHA-256: 2127f4e08967294a575e47d88d6b9d6818be166b29d7a97c3298cf757d1b298c
262 Risk Score

Malware Insights

Win.Trojan.Delf-10 · confidence 95%

MITRE ATT&CK
T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: DLL Side-Loading T1204 User Execution T1204.002 User Execution: Malicious File

The RTF file contains an embedded OLE object, identified as a PE executable by ClamAV. This suggests the RTF is acting as a dropper, designed to deliver a secondary malicious payload. The presence of the 'Win.Trojan.Delf-10' signature further supports this assessment.

Heuristics 7

  • 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.Delf-10 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Delf-10
  • 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
  • Suspicious extracted artifact info 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000000d2.bin
8031ec2f0af15e8be923388a52c43bff4130529b6086184ca91673be79f7c9f3		 rtf-objdata-decoded RTF \objdata at offset 0xD2 267544 bytes
Detection
ClamAV: Win.Trojan.Delf-10
Obfuscation or payload: likely
Carved artifact entropy is 7.88, consistent with packed or encrypted content.

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