alert tcp-pkt $HOME_NET any -> any 445 (msg:"ET INFO NTLM Session Setup Request - Negotiate"; flow:established,to_server; content:"NTLMSSP|00 01 00 00 00|"; fast_pattern; threshold:type limit,count 1,seconds 300,track by_src; classtype:misc-activity; sid:2067085; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2026_01_26, deployment Perimeter, deployment Internal, performance_impact Significant, confidence Medium, signature_severity Informational, updated_at 2026_01_26; target:src_ip;)