alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET USER_AGENTS Suspicious User-Agent (GUIDTracker)"; flow:established,to_server; http.user_agent; content:"GUIDTracker"; startswith; reference:md5,7a8807f4de0999dba66a8749b2366def; classtype:trojan-activity; sid:2013455; rev:7; metadata:affected_product Any, attack_target Client_Endpoint, created_at 2011_08_24, deployment Perimeter, confidence High, signature_severity Major, tag User_Agent, updated_at 2024_04_13;)