MALICIOUS
262
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
T1204.002 Malicious File
The RTF file contains embedded OLE object data, specifically a package object class with a PE header in hex data. ClamAV signatures identify this as Win.Trojan.Buzus-41. The presence of the PE header within the OLE object strongly suggests that this document is intended to deliver a secondary executable payload. The extracted artifact, objdata_00_off000000d1.bin, is also flagged as suspicious by static triage.
Heuristics 7
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PE header (with DOS stub) in hex data critical RTF_MZ_HEXHex-encoded PE (MZ + DOS stub) found inside RTF — likely an embedded executable payload
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ClamAV: Win.Trojan.Buzus-41 critical CLAMAV_DETECTIONClamAV detected this file as malware: Win.Trojan.Buzus-41
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ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAVClamAV 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.
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Package object class high RTF_OBJCLASS_PACKAGEOLE Package object — can wrap arbitrary files
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OLE object data medium RTF_OBJDATARTF contains 1 \objdata section(s) — embedded OLE objects
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Embedded OLE object medium RTF_OBJEMBRTF contains \objemb — embedded OLE object
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Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGEOne 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.
| Filename | Kind | Source | Size |
|---|---|---|---|
objdata_00_off000000d1.bin8396e75fd76389594c73dc84a27c5bb303036e759459a3beffe38cafb6f3ab8a |
rtf-objdata-decoded | RTF \objdata at offset 0xD1 | 33049 bytes |
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Detection
ClamAV:
Win.Trojan.Buzus-41
Obfuscation or payload:
likely
Carved artifact entropy is 7.47, consistent with packed or encrypted content.
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