RTF / .DOC malware analysis — malicious · 5f4b71e4968e877e

MALICIOUS

RTF / .DOC

877.3 KB

MD5: 33ba18af523e6abde86bdd1adf3bf452 SHA-1: a191108684d44472e1a059d3c9ae34913559874e SHA-256: 5f4b71e4968e877ecb5b41ce6f780b915cb2666cafc6e5c61434e8cb07600136

182 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE object data, specifically related to Equation Editor, and triggers heuristics indicating exploitation of CVE-2017-11882. This vulnerability is known to allow for arbitrary code execution, suggesting the file is designed to deliver a malicious payload. No specific family could be identified, but the attack pattern is consistent with a spearphishing attachment delivering an exploit.

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 2 \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_off000000b2.bin` `7a49cc611ba741c8f1a649e4647ac86a7b8cf4d596f481c110734e41b05859b7`	rtf-objdata-decoded	RTF \objdata at offset 0xB2	448896 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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