RTF / .DOC malware analysis — malicious · d406b975d0f2b825

MALICIOUS

RTF / .DOC

1.46 MB

MD5: 63e67b366f23b4d30c4fdb120a476721 SHA-1: 75f61f87cb74992b86b6c1ddab2c4c2c53196b54 SHA-256: d406b975d0f2b8252426508b73d1df1241e4272043ed22c9e64ad2d6ee4f45a9

182 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The RTF document contains an embedded OLE object that exploits the Equation Editor vulnerability. This exploit is designed to download and execute a secondary payload, indicated by the 'RTF_EQUATION_EDITOR' and 'RTF_OBJDATA' heuristic firings. The presence of a large, hex-encoded OLE object further supports the payload delivery mechanism. No document body text was available for analysis, but the technical indicators strongly suggest a malicious exploit delivery.

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.
\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 ~1530KB 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
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
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_off00001370.bin` `7ab90d4f9820ccd9a9eba825f13566fa695632e9ae764a6845706c3f62fe756f`	rtf-objdata-decoded	RTF \objdata at offset 0x1370	765283 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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