RTF malware analysis — malicious · 4f2342043956b27f

MALICIOUS

RTF

1.04 MB First seen: 2023-05-18

MD5: b1094adeba03f252490d5226899ea934 SHA-1: 55d1bdbfef9e9fc7e6e9d96e932ee8caec9f30fa SHA-256: 4f2342043956b27f27d21ff46c0465c3802d1ea5a436fe476600237d773aadce

102 Risk Score

Malware Insights

MITRE ATT&CK

T1559.001 Component Object Model

The RTF file contains a large OLE object with excessive hex-encoded data, a common technique for hiding malicious payloads. The \objupdate directive suggests an attempt to automatically activate this embedded object, likely to execute a secondary stage. No specific family is identifiable from the available heuristics.

Heuristics 4

\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 ~1088KB 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_off00000095.bin` `9a91aa2ccba46e3adf188462fe29880c33181bca7390e58381b626f1a65215e1`	rtf-objdata-decoded	RTF \objdata at offset 0x95	544392 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.

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