RTF / .DOC malware analysis — malicious · cdd4f66fe598fb83

MALICIOUS

RTF / .DOC

636.6 KB

MD5: a4a16a26c3c523df880322d2d67f94e9 SHA-1: d6a0db01a060a2d6f450695df09f58c532679992 SHA-256: cdd4f66fe598fb83c5499682a71f8b2de731adf92586da00920ff6aa41bc7fe6

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File Execution: User Execution T1059.003 Command and Scripting Interpreter: Windows Command Shell

The RTF file contains an embedded OLE object that decodes to a PE file, indicative of an exploit targeting the Equation Editor vulnerability. The presence of \objupdate suggests the OLE object is designed to be activated automatically, leading to the execution of the embedded payload. No document body text or scripts were extracted, but the heuristics strongly indicate a classic Equation Editor exploit delivery mechanism.

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_off00000043.bin` `ef766be6c7cb2cfcbe71daf8a64f0de532c4617bdd4000fdba5590a57e51145a`	rtf-objdata-decoded	RTF \objdata at offset 0x43	325797 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.

Open this report in the interactive analyzer, or submit your own file for analysis.