alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE JasperLoader CnC Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"?b="; content:"&v="; distance:0; content:"&psver="; distance:0; fast_pattern; isdataat:!2,relative; http.connection; content:"Keep-Alive"; startswith; endswith; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; content:!"|0d 0a|user-agent|0d 0a|"; content:!"|0d 0a|cache"; content:!"|0d 0a|accept"; classtype:command-and-control; sid:2027100; rev:6; metadata:attack_target Client_Endpoint, created_at 2019_03_19, deployment Perimeter, malware_family JasperLoader, performance_impact Low, confidence High, signature_severity Major, tag Downloader, tag JavaScript, updated_at 2024_05_01;)