alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE JsOutProx Variant CnC Activity"; flow:established,to_server; http.start; content:"POST / HTTP/1.1|0d 0a|Connection|3a 20|Keep-Alive|0d 0a|Content-Type|3a 20|application/x-www-Form-urlencoded|3b 20|Charset=UTF-8|0d 0a|"; fast_pattern; http.cookie; pcre:"/^[a-z]+=(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})+$/"; http.request_body; pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})+$/"; classtype:command-and-control; sid:2030114; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_05_06, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_05_06;)