alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Unknown Powershell Malvertising Payload CnC Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/online/tunupd.php?f="; fast_pattern; startswith; reference:url,infosec.exchange/@jeromesegura/111999221685860686; classtype:trojan-activity; sid:2051122; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, tls_state TLSEncrypt, created_at 2024_02_27, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Major, updated_at 2024_02_27; target:src_ip;)