RTF / .DOC malware analysis — malicious · df54b68098d20c3b

MALICIOUS

RTF / .DOC

959.4 KB

MD5: cce2179f3c271e443c0f54808027b03b SHA-1: db30680d2c8c5d9f44d967611cea7b19a6988218 SHA-256: df54b68098d20c3b1709afefe25b6fa4ca587b57c314de44add5a451988a3246

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 (CVE-2017-11882). The presence of RTF_EQUATION_EDITOR and RTF_OBJAUTLINK heuristics strongly indicates exploitation of this known vulnerability. The objupdate directive further suggests automatic activation of the embedded object, likely leading to the execution of a second-stage payload.

Heuristics 5

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.
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_off00000060.bin` `82c9025ebe14f4c221c3934b1fa382ea4fcabd40995e471c8a8f949adea291b4`	rtf-objdata-decoded	RTF \objdata at offset 0x60	459083 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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