RTF / .DOC malware analysis — malicious · 2eb29031ba92b4f7

MALICIOUS

RTF / .DOC

1.65 MB

MD5: 72c767f0f14c9d9e20a097524858283a SHA-1: e78abf7a991ce3ed776b829d3f76dbf8a46f6835 SHA-256: 2eb29031ba92b4f721999dcb57f22885749ae09dcb89bf867c63ac5348c3bead

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious File Execution: Malicious Code T1059.003 Command and Scripting Interpreter: Windows Command Shell

The RTF document contains an embedded OLE object that leverages the Equation Editor vulnerability. This vulnerability is known to be used for delivering second-stage payloads. The presence of a large, hex-encoded object within the RTF structure strongly suggests it's used to hide a malicious executable or script, which is then likely decoded and executed.

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.
\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 ~1722KB 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_off00001422.bin` `1710feb228d4899fb329d290e6e8785bc11881966e37dc71518c596b81de1f31`	rtf-objdata-decoded	RTF \objdata at offset 0x1422	861464 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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