alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET HUNTING AdFection Related Domain in TLS SNI (cookie-sync .xyz)"; flow:established,to_server; tls.sni; bsize:15; content:"cookie-sync.xyz"; fast_pattern; reference:url,citizenlab.ca/research/how-discover-tech-turned-targeted-ads-into-a-pipeline-for-spyware/; classtype:bad-unknown; sid:2072473; rev:1; metadata:affected_product Web_Browsers, affected_product Android, affected_product iOS, attack_target Client_Endpoint, created_at 2026_10_15, deployment Perimeter, malware_family AdFection, performance_impact Low, confidence High, signature_severity Minor, tag Exploit_Kit, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_10_15;)