RTF / .DOC malware analysis — malicious · d3dcf866f41cf696

MALICIOUS

RTF / .DOC

1.85 MB

MD5: f31d2d6a7d01e211141333c3ec6d4cf4 SHA-1: 29f4e3692eda9a58d505203b2aa55590890d7c51 SHA-256: d3dcf866f41cf696930dad4c6d1362e81b3d4d395dbd66761b6c7d882510fbac

202 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious File Execution: Malicious Code

The RTF file contains an embedded OLE object that leverages the Equation Editor vulnerability. The critical RTF_EQUATION_EDITOR heuristic indicates a decoded Equation Editor payload and a PE file, strongly suggesting exploitation. The presence of excessive hex data within the OLE object further supports the hiding of a malicious payload. The extracted artifact 'objdata_00_off0000188c.bin' is likely the dropped PE file.

Heuristics 6

Decoded Equation Editor payload + PE critical RTF_EQUATION_EDITOR

RTF decodes to an Equation Editor ProgID adjacent to OLE activation and the same decoded object stream contains embedded PE bytes. This matches the Equation Editor exploit surface used by CVE-2017-11882 / CVE-2018-0802 documents, while requiring payload evidence to avoid flagging benign Equation references.
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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1933KB 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
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_off0000188c.bin` `d2116ac300e707d6fecf45d2afb280b335cac8b8b634a91ab150f5d9bd42c018`	rtf-objdata-decoded	RTF \objdata at offset 0x188C	966997 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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