RTF / .DOC malware analysis — malicious · c244a100f8bf29e9

MALICIOUS

RTF / .DOC

930.5 KB

MD5: 1309eaf6d474b57306b7fac5dbcc76fb SHA-1: 9c54687bbfa248b938456b89fd1af393c9b7db82 SHA-256: c244a100f8bf29e987518708c3bcab6ae45da744e0b6e5911919af779850afd6

122 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an RTF document that contains an embedded OLE object, specifically targeting the Equation Editor vulnerability. The heuristics indicate that the Equation Editor payload was decoded and that an ".objupdate" command forces OLE activation, suggesting it's designed to execute arbitrary code. The decoded object is a PE file, confirming it's a payload dropper. The document body is heavily obfuscated and unreadable, providing no direct clues about the lure, but the technical indicators strongly point to a known exploit delivery mechanism.

Heuristics 4

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.
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_off00000d0d.bin` `c1e775585d05c68790f1a78606b84aa799fb90c3413d29e21b0d1ba5402813c5`	rtf-objdata-decoded	RTF \objdata at offset 0xD0D	474674 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.

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