RTF / .DOC malware analysis — malicious · f0fb1c2a2150e9a3

MALICIOUS

RTF / .DOC

1.59 MB

MD5: 486689c6ce47a8dae0d3c5dcfcde492e SHA-1: 058da3797e43116674bbffaa5617c5c88593a6e7 SHA-256: f0fb1c2a2150e9a33488974952af6c8f0cd52d463ab656e36d17b7d224d04f8e

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains an embedded OLE object with a split Equation Editor ProgID, a known method for exploiting Equation Editor vulnerabilities. The presence of excessive hex-encoded data within the object suggests a hidden payload. The ".bin" file extracted from the object data is highly suspicious and likely contains the malicious payload. The attack pattern is consistent with exploiting the Equation Editor to achieve arbitrary code execution.

Heuristics 5

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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1672KB 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_off00000057.bin` `fe5f6d6843c8cd21151f7f12eb6c0c5588d98552a1c3502b3e9c749e8a91f98a`	rtf-objdata-decoded	RTF \objdata at offset 0x57	836068 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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