alert udp any 11211 -> $EXTERNAL_NET any (msg:"ET DOS Possible Memcached DDoS Amplification Response Outbound"; flowbits:isset,ET.memcached.ddos; content:"STATS|20|pid"; depth:9; fast_pattern; threshold:type both, count 100, seconds 60, track by_dst; reference:url,blog.cloudflare.com/memcrashed-major-amplification-attacks-from-port-11211/; classtype:attempted-dos; sid:2025402; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Linux, attack_target Server, created_at 2018_03_01, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)