alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE JsOutProx CnC Activity - Inbound"; flow:established,from_server; http.stat_code; content:"200"; http.cookie; bsize:<30; content:"5f7c5f"; endswith; fast_pattern; http.content_type; content:"image/jpeg"; bsize:10; threshold:type limit, track by_src, count 1, seconds 30; classtype:command-and-control; sid:2034290; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_12_10, deployment Perimeter, malware_family jsoutprox, confidence High, signature_severity Major, tag RAT, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_12_10;)