alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE W32/Karagany.Downloader CnC Beacon"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/check_value.php"; http.user_agent; content:!"User-Agent|0d 0a|"; http.request_body; content:"identifiant="; depth:12; reference:url,vrt-blog.snort.org/2014/05/continued-analysis-of-lightsout-exploit.html; classtype:command-and-control; sid:2018443; rev:3; metadata:attack_target Client_Endpoint, created_at 2014_05_05, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_04_29, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)