alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE TA399/Sidewinder CnC Server Response"; flow:established,to_client; http.response_body; content:"|3c|h1|3e|Oops|21 3c 2f|h1|3e|"; content:"|3c|p|3e|Oops|21 20|This|20|page|20|is|20|stuck|20|in|20|SpongeBob|2e 2e 2e|s|20|pineapple|20|under|20|the|20|sea|2e 3c 2f|p|3e|"; distance:0; fast_pattern; reference:url,x.com/StrikeReadyLabs/status/1821133707077370041; reference:md5,ccec3e4857cbb197ac79b0f3b01f5189; classtype:trojan-activity; sid:2055079; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2024_08_08, deployment Perimeter, deployment SSLDecrypt, malware_family Sidewinder, confidence High, signature_severity Major, tag TA399, updated_at 2024_08_08;)