RTF / .DOC malware analysis — malicious · 52675c712969ab33

MALICIOUS

RTF / .DOC

1.20 MB

MD5: f08245c378ba851fd8aed497e597b0c9 SHA-1: 5fe73f6b0e7a4587bb4a9d87e50d31d8cc855eca SHA-256: 52675c712969ab33094a1c8fc4bb6b8ec34dae6a20eefdaeffe4b03b15d67035

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is an RTF document containing OLE object data, specifically a decoded Equation Editor payload. Heuristics indicate the presence of excessive hex data, likely hiding a malicious executable, and an \objupdate command to force OLE activation. This strongly suggests an exploit targeting the Equation Editor vulnerability to deliver a secondary payload. No specific family could be identified, but the delivery mechanism is clear.

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 ~1252KB 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_off00001c66.bin` `edfe3d7bce23b7871026fcfde6fa614e2b10d185113defc5439069d32eb2f33a`	rtf-objdata-decoded	RTF \objdata at offset 0x1C66	626395 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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