RTF / .DOC malware analysis — malicious · c6b6c3ad94852d0f

MALICIOUS

RTF / .DOC

1.85 MB

MD5: 8a415789b67c76118e31ca3748f528d0 SHA-1: 96ff9794cf429dd2bd8c7744622e28df2d6032a0 SHA-256: c6b6c3ad94852d0fb8d6cf6d3aa2c4bfd14c627287317a72995a4c59a12d331e

202 Risk Score

Malware Insights

MITRE ATT&CK

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

The RTF document contains an embedded OLE object that leverages the Equation Editor vulnerability. The critical RTF_EQUATION_EDITOR heuristic indicates that a PE file was decoded from this object, suggesting it's a downloader or dropper. The large amount of hex-encoded data further supports the presence of a hidden payload. No document body text or scripts were extracted, but the heuristics strongly point to an exploit delivery mechanism.

Heuristics 6

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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1933KB of hex-encoded data inside \objdata sections — may hide a payload
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_off00001864.bin` `73dc5bfe638c2b8d166519b92c83ae8e94c11c27757f8c3c6c1189e245a875b0`	rtf-objdata-decoded	RTF \objdata at offset 0x1864	966967 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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