alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE [TGI] BlackRAT Checkin Response"; flow:established,to_client; content:"|2c 20|Version="; content:"BlackRAT.Data"; distance:0; fast_pattern; content:"data|05|bytes"; distance:0; reference:md5,7aa313d007a538f7453a0f0f3b76ba1f; classtype:command-and-control; sid:2028565; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_09_10, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_09_10;)