RTF / .DOC malware analysis — malicious · 8b4c46d72c5a9d07

MALICIOUS

RTF / .DOC

934.3 KB

MD5: ee212803a822c7bd8e167530937cb9de SHA-1: a4c71493b7d3604de1a873c21f4564a947506bda SHA-256: 8b4c46d72c5a9d07a79cdd1e0fa978f0940049b3265236b59a2d78f9f8f19c43

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains an embedded OLE object that leverages the Equation Editor vulnerability. This vulnerability is known to be used for delivering second-stage payloads. The heuristic firings strongly indicate the exploitation of the Equation Editor to execute arbitrary code, likely leading to the download and execution of further malware.

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.
Automatically linked OLE object high RTF_OBJAUTLINK

RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
\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_off00000047.bin` `6aa2d34f37ee03c8213183950641c7b8e40201afcd68cd0240d648a97b12e514`	rtf-objdata-decoded	RTF \objdata at offset 0x47	478221 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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