RTF / .DOC malware analysis — malicious · b79ac89bc99c4d0d

MALICIOUS

RTF / .DOC

441.5 KB

MD5: 5f5c3e19ea34bd2aeb57b431fd01206b SHA-1: 463b2c35a0e948bbb3edbc1b432128396222c30c SHA-256: b79ac89bc99c4d0d1c6bb50e874b665b054630ede73ab55978e99d1023b8723d

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1203 Exploitation for Client Execution

The sample is an RTF document that contains an embedded OLE object, specifically targeting the Equation Editor vulnerability (RTF_EQUATION_EDITOR). The presence of \objdata and \objupdate heuristics indicates that the embedded object is designed to be activated automatically, leading to code execution. The extracted artifact 'objdata_00_off00000d0e.bin' is likely the payload or a component thereof. The attack pattern suggests a malicious document designed to exploit this vulnerability for initial access, likely to download and execute a secondary payload.

Heuristics 5

Equation Editor CLSID critical RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
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_off00000d0e.bin` `0ca7145f502af132d6c1c2560b2177a35ce1dde6468e6edbbe2de047dc3db98e`	rtf-objdata-decoded	RTF \objdata at offset 0xD0E	64066 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.92, consistent with packed or encrypted content.

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