alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET DELETED Kovter Ransomware Check-in"; flow:established,to_server; http.uri; content:".php?mode="; nocase; content:"&OS="; nocase; content:"&OSbit="; nocase; fast_pattern; reference:url,www.botnets.fr/index.php/Kovter; reference:md5,82d0e4f8b34d6d39ee4ff59d0816ec05; classtype:trojan-activity; sid:2016690; rev:16; metadata:attack_target Client_Endpoint, created_at 2013_04_02, deployment Perimeter, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_08_30, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)