alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET DELETED W32/Symmi.23950 Dropper CnC Beacon 1"; flow:established,to_server; content:"POST"; http_method; content:"/close/?channel="; http_uri; depth:16; content:"&ags="; http_uri; content:"&ai="; http_uri; reference:url,www.welivesecurity.com/2014/10/08/sednit-espionage-group-now-using-custom-exploit-kit/; reference:md5,df895e6479abf85c4c65d7d3a2451ddb; classtype:command-and-control; sid:2019390; rev:3; metadata:attack_target Client_Endpoint, created_at 2014_10_13, deployment Perimeter, signature_severity Major, tag c2, updated_at 2019_07_26, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)