alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET EXPLOIT_KIT Possible PurpleFox EK Framework URI Struct Jpg Request"; flow:established,to_server; urilen:>60; http.method; content:"GET"; http.uri; content:".jpg"; endswith; pcre:"/^\/(?!(?:[a-z]{16}|[0-9]{16}))[a-zA-Z0-9]{16}\/[a-zA-Z0-9]{16}\/[a-f0-9]{40}\/[a-zA-Z0-9]+\.jpg$/"; http.host; content:"rawcdn.githack.com"; fast_pattern; classtype:exploit-kit; sid:2031466; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_12_30, deployment Perimeter, deployment SSLDecrypt, confidence Medium, signature_severity Major, tag Exploit_Kit, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_12_30;)