RTF / .DOC malware analysis — malicious · 3bad6033988191a2

MALICIOUS

RTF / .DOC

5.88 MB

MD5: 226c273676fae7c34d393a0735cbe50b SHA-1: 290ef03669bfc57f2a724966751303b4301b7f4d SHA-256: 3bad6033988191a2d34ad597b5cb4cd8dc9dc52b209c0f4de315649a03cb653a

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 file contains an embedded OLE object, specifically decoded Equation Editor payload. This indicates an exploit targeting the Equation Editor vulnerability. The presence of excessive hex data and a suspicious extracted artifact suggests the object data is used to hide and deliver a secondary payload, likely downloaded from an external source.

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 ~6168KB 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_off00000042.bin` `501ed464e33651c3b868e38bf78ec94cc57e18ae30231a457254627b4af2aa1a`	rtf-objdata-decoded	RTF \objdata at offset 0x42	3084051 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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