RTF / .DOC malware analysis — malicious · 386bb73149655566

MALICIOUS

RTF / .DOC

895.7 KB

MD5: 86d326ce3959e15e4081b83f5773015b SHA-1: b96f77eaa10a347d1f8626fc3cbd4e56c965508e SHA-256: 386bb73149655566421cce3e6b3adda787fc44382ea7f046306275689ca0e611

122 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The RTF file contains an embedded OLE object that leverages the Equation Editor vulnerability (RTF_EQUATION_EDITOR). The \objupdate heuristic indicates that this object is designed to be activated automatically, triggering the execution of malicious code. This pattern is commonly used to download and execute a second-stage payload, hence the high confidence in this attack pattern. No specific family could be identified.

Heuristics 4

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_off00000035.bin` `f374da909a13c2cd0dfe273756af55c0c617bbc1669bd10bf488f6ddd459572b`	rtf-objdata-decoded	RTF \objdata at offset 0x35	458570 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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