RTF / .DOC malware analysis — malicious · af0f1613c4265a5a

MALICIOUS

RTF / .DOC

1.00 MB First seen: 2023-03-13

MD5: ce57d6e1defb119a0c2033c7863acf10 SHA-1: c9a8520e120f45a3ddc5a3db2303a36743ff64a6 SHA-256: af0f1613c4265a5adfb2a5b06a8abc91163daa51e28bd3657d2804c918371ab5

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

The RTF file contains a large OLE object with excessive hexadecimal data, strongly suggesting it is a hidden payload. The ".bin" artifact extracted from the objdata further supports this. While no specific malicious behavior was directly observed, the structure and content point towards a malicious document designed to deliver a secondary payload.

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 ~1053KB 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_off00000082.bin` `72c60e377df127f12f7e0ce3007fac45646bc26f6ef426fb57ee2f80e6abb96b`	rtf-objdata-decoded	RTF \objdata at offset 0x82	526565 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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