alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET ADWARE_PUP Win32/TrojanDownloader.Adload.NSD Variant Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".php?commandline="; fast_pattern; content:"&country="; distance:0; content:"&username="; distance:0; content:"&newpc="; distance:0; content:"&av="; distance:0; http.user_agent; content:"WinHttpClient"; bsize:13; reference:md5,dd6dca8dd2f53fdedeb5513f103ab711; classtype:pup-activity; sid:2033958; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_09_16, deployment Perimeter, performance_impact Low, confidence High, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_09_16;)