alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Ransomware.Hidden-Tear Variant CnC Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:!"/CADability.php"; nocase; content:".php?info="; fast_pattern; http.protocol; content:"HTTP/1.1"; http.header_names; content:"|0d 0a|Host|0d 0a|Connection|0d 0a 0d 0a|"; depth:22; endswith; reference:md5,5ae92b52b0a6df8a64a5f98700bc290f; classtype:command-and-control; sid:2034675; rev:6; metadata:attack_target Client_Endpoint, created_at 2016_03_29, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_10_02, reviewed_at 2023_10_02, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)