alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Suspicious User-Agent (Asteria md5)"; flow:established,to_server; http.user_agent; content:"d9d385b3522b242398af91fd425b386d"; startswith; reference:md5,56c16ad7da8cecb429dccb168aef46b7; classtype:trojan-activity; sid:2018985; rev:6; metadata:affected_product Any, attack_target Client_Endpoint, created_at 2014_08_22, deployment Perimeter, confidence High, signature_severity Major, tag User_Agent, updated_at 2024_04_13;)