RTF / .DOC malware analysis — malicious · ada16ed5fbd40c82

MALICIOUS

RTF / .DOC

307.7 KB

MD5: 209523184ccd378836f78390cb472a25 SHA-1: 27e83f86559fca08f5f2e0dfbdb2681cceb78400 SHA-256: ada16ed5fbd40c826ffa77e07dde821184f214994d52a6db4f226472a69e3e88

122 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.003 Windows Command Shell

The RTF document contains an embedded OLE object that leverages the Equation Editor vulnerability. The ".objupdate" heuristic indicates that the OLE object is designed to be activated automatically, likely triggering the execution of a decoded PE file. This file, identified as "objdata_00_off00000700.bin", is highly suspicious and suggests the document's primary purpose is to deliver a secondary malicious payload.

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_off00000700.bin` `26b9aff0a6012dc56aedff371fb17480e45a7a773eb247bacb4b4cae2d68a009`	rtf-objdata-decoded	RTF \objdata at offset 0x700	156376 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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