RTF malware analysis — malicious · c86a2460366d4646

MALICIOUS

RTF

1.09 MB Authoring application: Msftedit 5.41.15.1515

MD5: 644d8efe13e64b7e2a5e7d6dd08780ea SHA-1: 2fe172c1a0223ab94faaa9eaee1905fef4995744 SHA-256: c86a2460366d4646eb37bcc3d024c1b391ff07f5c6579d856cf4dd2868b6b003

302 Risk Score

Malware Insights

MITRE ATT&CK

T1559.001 Component Object Model T1137.001 DLL Search Order Hijacking

The RTF file contains a large OLE object with hex-encoded data, which is highly suspicious. This object decodes to a PE executable file, identified by ClamAV as Win.Trojan.Ag-1. The document body mentions 'Codigos do couter-strike', suggesting a lure related to the game Counter-Strike to trick users into opening the malicious embedded object. The embedded executable is the primary payload.

Heuristics 8

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.Ag-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Ag-1
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
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1140KB of hex-encoded data inside \objdata sections — may hide a payload
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.

Filename	Kind	Source	Size
`objdata_00_off000000dd.bin` `512e962f38fbdc05730dd453b14369051c5df0df2f1e0c62e4882f640194edda`	rtf-objdata-decoded	RTF \objdata at offset 0xDD	555894 bytes
Detection ClamAV: Win.Trojan.Ag-1 Obfuscation or payload: likely Carved artifact entropy is 7.97, consistent with packed or encrypted content.

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