RTF / .DOC malware analysis — malicious · 768e3902e97b4f45

MALICIOUS

RTF / .DOC

531.6 KB

MD5: fbc84ef1a87b7581f203b20757533359 SHA-1: 4fab9788bf8415626ff4677ba1dad7da90e5a930 SHA-256: 768e3902e97b4f455c601938013a3bb54ff9cf069e2249d3a47c191f8097f69e

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains an embedded OLE object that leverages the Equation Editor vulnerability. The `RTF_EQUATION_EDITOR` heuristic indicates a decoded Equation Editor payload with a PE file, strongly suggesting exploitation of CVE-2017-11882. The `RTF_OBJAUTLINK` and `RTF_OBJUPDATE` heuristics further confirm that the embedded object is designed to be automatically activated, leading to the execution of the malicious PE payload.

Heuristics 5

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.
Automatically linked OLE object high RTF_OBJAUTLINK

RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
\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_off00000074.bin` `63269eda322fd3c5f7a62a3feaeddbe1cd7efe797480dacc01fe3835f8d26efa`	rtf-objdata-decoded	RTF \objdata at offset 0x74	272019 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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