RTF / .DOC malware analysis — malicious · 39874a3d6b4e215c

MALICIOUS

RTF / .DOC

67.6 KB

MD5: 6a1b83a7851c28e08023fbacf5ce0e19 SHA-1: 4ba8e811ef491fa5bea8002a8f5cbf214ec80cce SHA-256: 39874a3d6b4e215cb41fed76a2b9d639efc4ede9837dd20897b24655e0145003

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains an embedded OLE object that leverages the Equation Editor vulnerability (CVE-1997-2455 or similar). The presence of `RTF_EQUATION_EDITOR` and `RTF_OBJAUTLINK` heuristics strongly indicates exploitation of this known vulnerability. The `RTF_OBJUPDATE` heuristic suggests the object is designed to be activated automatically. The `objdata_00_off000009f0.bin` artifact is likely the payload or a component thereof, though its specific function cannot be determined without further analysis. The document body is heavily obfuscated and unreadable, providing no additional context.

Heuristics 5

Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR

RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
Automatically linked OLE object high RTF_OBJAUTLINK

RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
\objupdate forces OLE activation high RTF_OBJUPDATE

RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
OLE object data medium RTF_OBJDATA

RTF contains 1 \objdata section(s) — embedded OLE objects
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_off000009f0.bin` `56fa38ebab7a32ae16284541200a55c00cc1b57117eeea8ff654954ea3a66546`	rtf-objdata-decoded	RTF \objdata at offset 0x9F0	33009 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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