alert dns $HOME_NET any -> any any (msg:"ET INFO Observed DNS Query to trycloudflare .com Domain"; dns.query; dotprefix; content:".trycloudflare.com"; nocase; endswith; reference:url,try.cloudflare.com/; reference:url,www.bleepingcomputer.com/news/security/hackers-abuse-free-trycloudflare-to-deliver-remote-access-malware/; classtype:misc-activity; sid:2060249; rev:3; metadata:affected_product Any, attack_target Client_and_Server, tls_state plaintext, created_at 2025_02_21, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, updated_at 2025_02_24, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1665, mitre_technique_name Hide_Infrastructure;)