alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed DefendNot Domain (dnot .sh in TLS SNI)"; flow:established,to_server; tls.sni; dotprefix; content:".dnot.sh"; endswith; fast_pattern; reference:url,github.com/es3n1n/defendnot; classtype:trojan-activity; sid:2068056; rev:1; metadata:attack_target Client_Endpoint, created_at 2026_03_06, deployment Perimeter, malware_family DefendNot, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_03_06;)