alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET USER_AGENTS Suspected Mekotio User-Agent (MyCustomUser)"; flow:established,to_server; http.user_agent; bsize:12; content:"MyCustomUser"; fast_pattern; reference:url,www.welivesecurity.com/2020/08/13/mekotio-these-arent-the-security-updates-youre-looking-for/; classtype:trojan-activity; sid:2030721; rev:2; metadata:attack_target Client_Endpoint, created_at 2020_08_21, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_24;)