alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET ADWARE_PUP Downer.B Variant Checkin"; flow:established,to_server; http.method; content:"GET"; content:"winver="; distance:0; content:"&sdsoft="; distance:0; fast_pattern; content:"&webid="; distance:0; content:"&softid"; distance:0; content:"&usesnum="; distance:0; content:"&mac="; distance:0; content:"&filename="; distance:0; reference:md5,fa304e71504863f32e6f9032b772cea1; reference:md5,b4188819a0da135ada42e2df4fa97619; classtype:pup-activity; sid:2030565; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_07_21, deployment Perimeter, performance_impact Low, confidence High, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_04_08;)