alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET USER_AGENTS Suspicious User-Agent Im Luo"; flow:established,to_server; http.user_agent; content:"Im|27|Luo"; startswith; classtype:trojan-activity; sid:2012586; rev:6; metadata:affected_product Any, attack_target Client_Endpoint, created_at 2011_03_28, deployment Perimeter, confidence High, signature_severity Major, tag User_Agent, updated_at 2020_08_13;)