RTF / .DOC malware analysis — malicious · 6fa5418c2d6be4fa

MALICIOUS

RTF / .DOC

108.7 KB

MD5: 1609edfbd233ed2a0966754879cf6b0c SHA-1: 585102686b35074e6e34d9200b02ea86504b0381 SHA-256: 6fa5418c2d6be4fa62f96b699e7310903fb351ff26e22adf41ef617efb417b43

182 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an OLE object related to CVE-2017-11882, indicating exploitation of the Equation Editor vulnerability. This exploit likely leads to the execution of a second-stage payload, as suggested by the high-entropy carved artifact. The file is delivered as an attachment, likely via spearphishing.

Heuristics 5

Equation Editor OLE1 native payload — CVE-2017-11882 related critical CVE related CVE_2017_11882_RELATED

RTF decodes to an OLE1 Equation.3 embedded object whose native data is large and payload-like, and \objupdate requests automatic activation. This is the delivery shape used by Equation Editor RCE documents such as CVE-2017-11882/CVE-2018-0802, but the malformed MTEF record needed for exact attribution was not recovered.
Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR

RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
\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_off00000066.bin` `8d7a012c0151c7fb9546fd0e28f0f5d8b41cb11a06774d2c7f2ee7295dd58dda`	rtf-objdata-decoded	RTF \objdata at offset 0x66	55516 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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