alert http1 $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Ransomware/Coverton Checkin"; flow:established,to_server; http.uri; content:".php?ch="; fast_pattern; http.content_type; bsize:33; content:"application/x-www-form-urlencoded"; http.content_len; byte_test:0,=,0,0,string,dec; http.header_names; content:!"|0d 0a|User-Agent|0d 0a|"; content:!"|0d 0a|Referer|0d 0a|"; content:"|0d 0a|Content-Type|0d 0a|Content-length|0d 0a|"; reference:md5,c5c4f4860c69ea7469ca3be3caf5bf18; classtype:command-and-control; sid:2022676; rev:7; metadata:attack_target Client_Endpoint, created_at 2016_03_28, deployment Perimeter, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_19, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)