RTF / .DOC malware analysis — malicious · fb74843103876ff1

MALICIOUS

RTF / .DOC

67.7 KB

MD5: 7f5f6ddd79cfd8f378649f7cbe148a90 SHA-1: 8b334643da24ab1f5530a86a2bc0d2c06d36a1c2 SHA-256: fb74843103876ff17cf532aec1bd261d3ae47fa10d3ccefcaef62e13b29600d3

122 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious File: User Execution: Malicious File T1059.003 Command and Scripting Interpreter: Windows Command Shell

The RTF file contains an embedded OLE object that leverages the Equation Editor vulnerability (RTF_EQUATION_EDITOR). The ".objupdate" heuristic indicates that the OLE object is designed to be activated automatically, likely leading to the execution of a malicious Portable Executable (PE) file. The extracted artifact 'objdata_00_off00000e64.bin' is the decoded payload from this object.

Heuristics 4

Decoded Equation Editor payload + PE critical RTF_EQUATION_EDITOR

RTF decodes to an Equation Editor ProgID adjacent to OLE activation and the same decoded object stream contains embedded PE bytes. This matches the Equation Editor exploit surface used by CVE-2017-11882 / CVE-2018-0802 documents, while requiring payload evidence to avoid flagging benign Equation references.
\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_off00000e64.bin` `d099f730af7bb4f4ec895c502802e79b2e5f17153a0e970e5bc1a813871b4f64`	rtf-objdata-decoded	RTF \objdata at offset 0xE64	32567 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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