alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE SillyRAT CnC Victim Keylogger Exfil"; flow:established,to_server; content:"NbS2V5LnNoaWZ0XU"; fast_pattern; content:"lbS2V5LnNwYWNlXW"; content:"WRbS2V5LmVudGVy"; threshold:type limit,count 1,seconds 300,track by_src; reference:url,github.com/hash3liZer/SillyRAT; classtype:command-and-control; sid:2063516; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Linux, attack_target Client_Endpoint, tls_state plaintext, created_at 2025_07_16, deployment Perimeter, malware_family SillyRat, confidence High, signature_severity Critical, updated_at 2025_07_16, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1095, mitre_technique_name Non_Application_Layer_Protocol; target:src_ip;)