alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE DeskRAT CnC Welcome Message"; flow:established,to_client; content:"|7b 22|type|22 3a 22|welcome|22 2c 22|client|5f|id|22 3a 22|"; depth:35; content:"|22 2c 22|data|22 3a 22|Welcome|20|to|20|Stealth|20|Server|22 2c 22|"; fast_pattern; threshold:type limit,count 1,seconds 300,track by_dst; classtype:command-and-control; sid:2066659; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_01_09, deployment Perimeter, deployment SSLDecrypt, malware_family DeskRAT, confidence High, signature_severity Critical, updated_at 2026_01_09; target:dest_ip;)