alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET DELETED Suspicious User-Agent (ld)"; flow:to_server,established; threshold:type limit, count 2, track by_src, seconds 300; http.user_agent; content:"ld"; depth:2; endswith; classtype:trojan-activity; sid:2008342; rev:14; metadata:affected_product Any, attack_target Client_Endpoint, created_at 2010_07_30, deployment Perimeter, signature_severity Major, tag User_Agent, updated_at 2021_06_23;)