alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET ADWARE_PUP DriverPack Update Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/notifier/watcher-check/?t="; fast_pattern; startswith; pcre:"/\d{13}$/UR"; http.host; content:".drp.su"; endswith; http.header_names; content:!"Referer"; reference:md5,63181b2e347fbe0faf02e26085513a05; classtype:pup-activity; sid:2037896; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_08_02, deployment Perimeter, performance_impact Low, confidence High, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_08_02, reviewed_at 2024_09_17;)