Buzus — RTF / .DOC malware analysis

Static analysis result for SHA-256 53dd99110372175c…

MALICIOUS

RTF / .DOC

74.0 KB Authoring application: Msftedit 5.41.15.1515
MD5: aecb55515341254b913345b4f54f7ee6 SHA-1: 49eb7098e64ffadf5cc83438003ec237572fdd9b SHA-256: 53dd99110372175c1169b9c10425263704274e2f653cd3c9f14a350c917fd03c
262 Risk Score

Malware Insights

Buzus · confidence 95%

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1137.001 DLL Side-Loading

The RTF file contains an embedded OLE object which is identified as a PE executable by ClamAV. The presence of RTF_OBJDATA, RTF_OBJEMB, and RTF_OBJCLASS_PACKAGE heuristics strongly suggests the embedding of an executable. ClamAV detection of 'Win.Trojan.Buzus-7479' on both the main file and the extracted artifact confirms the malicious nature and points to the Buzus family.

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.Buzus-7479 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Buzus-7479
  • 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
23e311290e3a0fe7e4beb258aeea55fc2c9c2d269d277e71b569854d2bc6ccbc		 rtf-objdata-decoded RTF \objdata at offset 0xD2 33039 bytes
Detection
ClamAV: Win.Trojan.Buzus-7479
Obfuscation or payload: likely
Carved artifact entropy is 7.47, consistent with packed or encrypted content.

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