RTF / .DOC malware analysis — malicious · 43d0ce405a3ab64b

MALICIOUS

RTF / .DOC

1.20 MB

MD5: d9458421176ca1515f81f1de0bbf682e SHA-1: d7b46ecc2dd059b171a1d33ad274c5b76f926f2b SHA-256: 43d0ce405a3ab64be3898040e6f04e8e9e244927e7aee465a58254c98484daad

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is an RTF document that contains OLE object data, specifically targeting the Equation Editor vulnerability. The presence of a large, hex-encoded OLE object suggests it's used to hide a payload. The RTF_EQUATION_EDITOR and RTF_OBJUPDATE heuristics confirm the exploitation of this component to likely download and execute a second-stage payload. No document body text was available for analysis, but the heuristics strongly indicate a malicious exploit delivery.

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 ~1252KB 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_off00000cb4.bin` `666e58a3df12832bc6f0e2ff163bff07138a1335c2af5c74c021b8fe496f6381`	rtf-objdata-decoded	RTF \objdata at offset 0xCB4	626057 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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