alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Possible TickGroup Coolbee/Avenger CnC Activity"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/index.php?id="; content:"&group="; distance:0; content:"&class="; distance:0; fast_pattern; http.header_names; content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a 0d 0a|"; depth:22; endswith; reference:url,documents.trendmicro.com/assets/pdf/Operation-ENDTRADE-TICKs-Multistage-Backdoors-for-Attacking-Industries-and-Stealing-Classified-Data.pdf; reference:md5,507daf07c6f8f0080b5c4f818cfe77cb; classtype:command-and-control; sid:2029095; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_12_04, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_24;)