Rule History

SID: 2067802 • Source: et/open

Versions (2)

Version DetailsCurrent

Rev: 1 • Feb 17, 2026, 12:00 PM

Message:

ET MALWARE Observed TrustConnect RAT Domain (networkservice .cyou in TLS SNI)

Rule:

alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed TrustConnect RAT Domain (networkservice .cyou in TLS SNI)"; flow:established,to_server; tls.sni; dotprefix; content:".networkservice.cyou"; endswith; fast_pattern; classtype:trojan-activity; sid:2067802; rev:1; metadata:attack_target Client_Endpoint, created_at 2026_02_17, deployment Perimeter, malware_family TrustConnect, confidence High, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_02_17;)

Created:

Feb 17, 2026, 12:00 PM

Updated:

Feb 17, 2026, 12:00 PM

DB Created:

Feb 17, 2026, 10:34 PM

DB Updated:

Feb 18, 2026, 10:34 PM

Filename:

rules/emerging-malware.rules