RTF / .DOC malware analysis — malicious · f296e7cc7304cdaf

MALICIOUS

RTF / .DOC

1.61 MB

MD5: 926542358e5332b63ffafd101d70e8aa SHA-1: 90809edc8f2e196d915f59ac81f2477b46fee7ea SHA-256: f296e7cc7304cdaf38aa67f0bb9c905ae0e34720be60e4ebb0808a3ee005ccd7

162 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1559.001 Component Object Model T1027 Obfuscated Files or Information

The RTF file contains embedded OLE object data, specifically decoded Equation Editor payload and PE data. The presence of excessive hex data within the object data suggests a hidden payload. The ".objupdate" directive further indicates that the OLE object is intended to be activated, likely leading to the execution of the embedded malicious code.

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 ~1688KB 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_off00000066.bin` `ddff6e794f654d0910f6424f28ef1be1ac12e3383d68d601e00fa13a84832c83`	rtf-objdata-decoded	RTF \objdata at offset 0x66	844180 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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