alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/RiskWare.YouXun.AD CnC Activity"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"?sc="; content:!"&"; distance:0; http.content_type; content:"application/x-www-form-urlencoded"; bsize:33; http.user_agent; content:"Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.31 (KHTML, like Gecko) Chrome/26.0.1410.64 Safari/537.31"; bsize:101; fast_pattern; reference:md5,2292c6acb1e5f139900b9d1942b14b08; classtype:command-and-control; sid:2032977; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_05_18, deployment Perimeter, malware_family Win32_RiskWare_YouXun_AD, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_05_18;)