RTF / .DOC malware analysis — malicious · 7b69c7f83f01b10f

MALICIOUS

RTF / .DOC

312.1 KB

MD5: f4b301326c802ee6f91e3c8303feeaaf SHA-1: 9de9a2a075fd41a6c4fa55d4b15e10ba982bcef2 SHA-256: 7b69c7f83f01b10f56f16d2c1f495045bf9926361bf7e3631cc5576d2a3be15e

122 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious File: User Execution: Malicious File

The RTF document contains an embedded OLE object that leverages the Equation Editor vulnerability (CVE-2017-11882). The ".objdata" and ".objupdate" heuristics indicate that this object is designed to be activated, likely leading to the execution of a decoded Portable Executable (PE) file. This is a common delivery mechanism for malware aiming to compromise systems via unpatched vulnerabilities.

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_off0000174e.bin` `044589d429e1d1024a604f0aa62112282e2b5c000c45b5bb2e0d75d221e5116c`	rtf-objdata-decoded	RTF \objdata at offset 0x174E	156709 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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