alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE RMM Payload Delivery Behvaior Observed in HTTP Cookies"; flow:established,to_server; http.method; content:"GET"; http.cookie; content:"_pre_check="; startswith; pcre:"/^[a-z0-9]{8}/R"; content:"|2c 20|captcha_token"; within:16; fast_pattern; classtype:trojan-activity; sid:2068409; 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_03_24, deployment Perimeter, deployment SSLDecrypt, confidence Medium, signature_severity Major, tag RMM, updated_at 2026_03_24; target:src_ip;)