RTF / .DOC malware analysis — malicious · c92b22cf862f3083

MALICIOUS

RTF / .DOC

1.85 MB

MD5: 6c375bb17884f4b4c12c2e4a959d585a SHA-1: b36af9ddd7468a60cdf8053824891528ac361f56 SHA-256: c92b22cf862f308308db0ff6457cec42bff63e7b08a507cb01d3b1c8f09d1c54

202 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1027 Obfuscated Files or Information

The RTF document contains multiple indicators of exploitation targeting the Equation Editor vulnerability. Specifically, the presence of OLE object data, automatic linking, and excessive hex-encoded data strongly suggests the embedding of a malicious object. This object is likely designed to download and execute a second-stage payload, as indicated by the heuristic 'RTF_EQUATION_EDITOR' and the large extracted binary artifact. The overall attack pattern is consistent with exploiting this known vulnerability to achieve arbitrary code execution.

Heuristics 6

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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1934KB 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_off00000949.bin` `08d7be3cb4036b623f529587af23bb510b3affdbc78599b72535dc8a43df4d62`	rtf-objdata-decoded	RTF \objdata at offset 0x949	967047 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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