RTF / .DOC malware analysis — malicious · c9734af57c278173

MALICIOUS

RTF / .DOC

311.1 KB

MD5: a1ae85656252a5ee1f221935421eb8d0 SHA-1: 06db6b72f7df42b9f050f3870ac90f9aa6339c95 SHA-256: c9734af57c2781738a9a0488e9fe1d4dcdb41afb577d5c22f58fa66f98b112aa

122 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains an embedded OLE object that leverages the Equation Editor vulnerability (RTF_EQUATION_EDITOR). The ".objupdate" heuristic indicates that the OLE object is activated automatically, leading to the execution of a decoded PE file. The presence of RTF_OBJDATA and the extracted artifact 'objdata_00_off00001097.bin' further support this attack vector. The exact payload and its behavior are not detailed in the provided evidence, but the exploit mechanism is clear.

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_off00001097.bin` `fffa09870e5b39bc345b499cc741859b55c5a86e79d8a76c36d8e9c91ef2b170`	rtf-objdata-decoded	RTF \objdata at offset 0x1097	157087 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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