RTF / .DOC malware analysis — malicious · 925c378d40a93163

MALICIOUS

RTF / .DOC

312.9 KB

MD5: dcb1d1d06904a86349bfe1067a82cc9b SHA-1: b9b0a379ff8dde20265d83dfe55220d1d02c473a SHA-256: 925c378d40a9316392ebcafd83d74e9148741afa2f88e67c76b1f9bca8365423

122 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an RTF document that contains an embedded OLE object, specifically targeting the Equation Editor vulnerability. The presence of `RTF_EQUATION_EDITOR` and `RTF_OBJUPDATE` heuristics strongly indicates exploitation of this component. The `RTF_OBJDATA` heuristic suggests that the embedded object is being used to deliver a payload, likely for downloading and executing a second-stage malicious file. The document body is heavily obfuscated and does not provide clear user-facing content, further supporting a malicious intent through exploitation.

Heuristics 4

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.
\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_off0000168b.bin` `5a0e8e1b6e7196761d5cca38abfac6b38da95dfeb47625ae338bd24d40f6a1e8`	rtf-objdata-decoded	RTF \objdata at offset 0x168B	157059 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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