RTF / .DOC malware analysis — malicious · cc3b971f25d0ad41

MALICIOUS

RTF / .DOC

1.47 MB

MD5: 973992ab7ffd7202b6f3d40f1828625c SHA-1: 4181c8d062508316f6727e73337c7617f6dc2ce8 SHA-256: cc3b971f25d0ad410dbe3b7d1d6235041eb36632d0ea6e8d34a6a94e41d79df3

162 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1566.001 Spearphishing Attachment

The RTF file contains a decoded Equation Editor payload, indicating an exploit targeting this component. The presence of large, hex-encoded data within OLE object data strongly suggests the embedding of a secondary executable. The ".objupdate" heuristic further confirms that the embedded object is designed to be activated, likely leading to the execution of the hidden payload.

Heuristics 5

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.
\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 ~1540KB 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_off00000044.bin` `be61b6ddc1e7e762ed1e186d82c1327fd7aaf7637642425ff6ee3af33ca729c7`	rtf-objdata-decoded	RTF \objdata at offset 0x44	770510 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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