RTF / .DOC malware analysis — malicious · 6992afd8e51a80cf

MALICIOUS

RTF / .DOC

63.6 KB

MD5: e3a18fcfaeed6940aae0ea5193bc77dd SHA-1: 3ac3f031d4bbbc827b1d0e834ccd4fbb559ce855 SHA-256: 6992afd8e51a80cfe1de4b21687377346897e7ecdc14af2d009f7e6b90a98c95

182 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains an embedded OLE object associated with Equation Editor, specifically triggering the CVE-2017-11882 vulnerability. This exploit is designed to execute arbitrary code, likely a second-stage payload, upon activation. The presence of the ".bin" file and the high entropy of the carved artifact further suggest the execution of a malicious binary.

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_off00000043.bin` `9b36bb242cf6ed092d5a4373f6859827b126e62bef404aa7ee3418c64c322b57`	rtf-objdata-decoded	RTF \objdata at offset 0x43	32394 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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