alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Microsoft net.tcp Connection Initialization Activity"; flow:established,to_server; dsize:<50; content:"|00 01 00 01 02 02|"; startswith; content:"net.tcp|3a 2f 2f|"; distance:1; within:11; fast_pattern; content:"|3a|"; distance:0; content:"|2f 03 08 0c|"; endswith; reference:md5,6b5c7d46224b4d7c38ec620c817867ad; classtype:bad-unknown; sid:2043233; rev:6; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_09_22, deployment Perimeter, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_05_31, reviewed_at 2024_05_06, former_sid 2850027;)