alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET ADWARE_PUP Win32/Adware.Adposhel.A Checkin M6"; flow:established,to_server; http.method; content:"GET"; http.uri; bsize:>200; content:"/q/?q="; fast_pattern; startswith; pcre:"/^[a-zA-Z0-9_-]+/R"; http.user_agent; content:"User-Agent|3a 20|"; startswith; http.header_names; content:!"|0d 0a|Referer|0d 0a|"; content:!"|0d 0a|Accept"; classtype:pup-activity; sid:2029055; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_11_26, deployment Perimeter, performance_impact Low, confidence High, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_12;)