RTF / .DOC malware analysis — malicious · cd61de3e92849d73

MALICIOUS

RTF / .DOC

707.3 KB

MD5: 0a32a8cc9f137a0672399bc48efa9b83 SHA-1: 1ab1d08ef510e13b79b440bb3106a66d99c4889e SHA-256: cd61de3e92849d73bb83fb6c55ba731a2ab603cdf89b9e460256f0bee6fe830c

142 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File T1559.001 Component Object Model T1059.003 Windows Command Shell

The RTF file contains an embedded OLE object that decodes to a Portable Executable (PE) file, specifically targeting the Equation Editor vulnerability. The ".objupdate" heuristic indicates that the embedded object is designed to be automatically activated upon opening the document, leading to the execution of the decoded payload. The presence of a PE file within the OLE object strongly suggests a downloader or dropper functionality.

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.
OLE object data medium RTF_OBJDATA

RTF contains 1 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
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_off0000006a.bin` `9dadb22e8963800c57b4018077eac1b621b1c15fe7b336aa25db69abbc054ff4`	rtf-objdata-decoded	RTF \objdata at offset 0x6A	362012 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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