alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/DarkRAT CnC Activity"; flow:established,to_server; http.method; content:"POST"; http.uri; content:!".php"; http.request_body; content:"request=YUhkcFpEM"; depth:17; fast_pattern; pcre:"/^[A-Za-z0-9\/\+\=]{100,}$/Rsi"; http.header_names; content:!"Referer"; reference:url,github.com/albertzsigovits/malware-writeups/tree/master/DarkRATv2; classtype:command-and-control; sid:2027886; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_08_15, deployment Perimeter, malware_family DarkRAT, performance_impact Moderate, confidence High, signature_severity Major, updated_at 2020_10_20;)