alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET ADWARE_PUP PUP Win32/ELEX Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/v"; startswith; content:"?update"; fast_pattern; distance:0; pcre:"/^[0-9]?=[a-z]+/Ri"; http.header_names; to_lowercase; content:!"|0d 0a|user-agent|0d 0a|"; content:!"|0d 0a|accept"; content:!"|0d 0a|referer|0d 0a|"; reference:md5,2fed7fe9d055ebb63897bc2c8996676d; reference:md5,e2fd0d2c44e96cab5017bb8a68ca92a6; classtype:pup-activity; sid:2019779; rev:10; metadata:created_at 2014_11_24, signature_severity Minor, updated_at 2024_05_01;)