alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET USER_AGENTS Suspicious User-Agent _updater_agent"; flow:established,to_server; http.header; content:"User-Agent|3A 20|_updater_agent"; classtype:trojan-activity; sid:2013395; rev:4; metadata:affected_product Any, attack_target Client_Endpoint, created_at 2011_08_10, deployment Perimeter, confidence High, signature_severity Major, tag User_Agent, updated_at 2020_08_13;)