alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Ransomware Win32/WinPlock.A CnC Beacon 10"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php?rnd="; http.request_body; content:"P"; depth:1; content:"M STATE|3a 20|CRYPTED_"; nocase; fast_pattern; pcre:"/^\d+\x20/R"; http.header_names; content:!"Referer|0d 0a|"; reference:md5,6f2159e72e7ab7b02e18211ecbed7dd3; reference:url,researchcenter.paloaltonetworks.com/2015/09/updated-pclock-ransomware-still-comes-up-short/; classtype:command-and-control; sid:2021861; rev:5; metadata:attack_target Client_Endpoint, created_at 2015_09_30, deployment Perimeter, malware_family Win32_WinPlock_A, signature_severity Major, tag c2, updated_at 2020_10_05, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)