alert udp $EXTERNAL_NET any -> $HOME_NET 389 (msg:"ET DOS Potential CLDAP Amplification Reflection"; content:"objectclass0"; fast_pattern; threshold:type both, count 200, seconds 60, track by_src; reference:url,www.akamai.com/us/en/multimedia/documents/state-of-the-internet/cldap-threat-advisory.pdf; reference:url,packetstormsecurity.com/files/139561/LDAP-Amplication-Denial-Of-Service.html; classtype:attempted-dos; sid:2024585; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Linux, attack_target Client_and_Server, created_at 2017_08_16, deployment Perimeter, performance_impact Significant, confidence Medium, signature_severity Major, updated_at 2019_07_26;)