RTF / .DOC malware analysis — malicious · 51c92461339f6e24

MALICIOUS

RTF / .DOC

216.5 KB First seen: 2022-09-29

MD5: 2fe73a35306300d8329fe744dbcb67a5 SHA-1: 28e19b2924cde739fff3ee91da094e4b7d0a711e SHA-256: 51c92461339f6e2460dad1305d5a3fafea1212785d6355d5359807b5d98fe43c

200 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File

The RTF document contains OLE objects with embedded data, specifically triggering the CVE-2017-8570 vulnerability through a composite moniker. This vulnerability is known to facilitate the dropping and execution of script files, indicating a likely initial access vector for further malicious activity.

Heuristics 6

Composite Moniker — CVE-2017-8570 (drops SCT script) critical CVE related CVE_2017_8570

RTF \objdata decodes to OLE data containing the Composite Moniker — CVE-2017-8570 (drops SCT script) CLSID — the vulnerable control/moniker is embedded directly in the document's object stream, the delivery shape of this exploit. RTF objects auto-render when Word opens the file.
Composite Moniker in RTF OLE object high CVE related RTF_COMPOSITE_MONIKER_RELATED

RTF contains Composite Moniker CLSID in OLE object context, but no nearby scriptlet/SCT payload was confirmed. Treat as related moniker attack-surface evidence rather than proof of CVE-2017-8570 exploitation.
\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.
OLE object data medium RTF_OBJDATA

RTF contains 3 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
Suspicious extracted artifact medium 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000007d5.bin` `9bc76be107c65e0c044fb5902541de605ebf8e415697ff2ffd0c416f747adc44`	rtf-objdata-decoded	RTF \objdata at offset 0x7D5	15168 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off000083b1.bin` `4cc36443fa44ed33938505885646b0c9fc55e3bc3b8242308f3e532b1f6236be`	rtf-objdata-decoded	RTF \objdata at offset 0x83B1	2632 bytes
`objdata_02_off00009954.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0x9954	12297 bytes

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