RTF / .DOC malware analysis — malicious · 2664162d0341d8e5

MALICIOUS

RTF / .DOC

1.60 MB

MD5: 30244581b41accd77dab936571e0d87e SHA-1: 46ddb3fa250dfb4808c3a43f7846d7c643a4f325 SHA-256: 2664162d0341d8e5cf1cf3a290b77406d87111e3c9ff3fcf3a4f0836d15d3afe

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is an RTF document containing a decoded Equation Editor payload, indicating an exploit attempt. The presence of OLE object data and excessive hex data suggests the embedding of a malicious executable. The primary attack vector appears to be exploiting the Equation Editor vulnerability to facilitate the download and execution of a secondary payload, likely disguised within the objdata artifact.

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 ~1670KB 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_off00001ccf.bin` `154dd0e85ce0ca899a9770ae1b668d13e87853c8bc8ab94ba982c664a36558a8`	rtf-objdata-decoded	RTF \objdata at offset 0x1CCF	835063 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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