alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET ADWARE_PUP Win32/YTDDownloader.F Variant CnC Activity"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/images/pixel.gif?action=install&point=start&version="; startswith; fast_pattern; content:"&lngid="; distance:0; content:"&cid="; distance:0; content:"&isn="; distance:0; content:"&kt="; distance:0; content:"&lt=0"; endswith; reference:md5,5e438deb5e2dd34dcf6e96c8c97f8981; classtype:pup-activity; sid:2029546; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_02_27, deployment Perimeter, confidence High, signature_severity Minor, updated_at 2020_02_27;)