alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Interactsh Domain (.oast .online in TLS SNI)"; flow:established,to_server; tls.sni; bsize:45; content:".oast.online"; fast_pattern; endswith; reference:url,github.com/projectdiscovery/interactsh; reference:url,unit42.paloaltonetworks.com/exploits-interactsh/; classtype:misc-activity; sid:2047782; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_08_28, performance_impact Low, confidence High, signature_severity Informational, updated_at 2023_08_28, reviewed_at 2023_08_28, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1567, mitre_technique_name Exfiltration_Over_Web_Service; target:src_ip;)