alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32.Agent.Y!c CnC Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/vendas/Cadastra.php?pc="; startswith; fast_pattern; content:"&serial="; distance:0; http.user_agent; content:"Indy Library"; http.header_names; content:"|0d 0a|Host|0d 0a|Accept|0d 0a|Accept-Encoding|0d 0a|User-Agent|0d 0a 0d 0a|"; startswith; reference:md5,c0b6cbb039bdbd86dcdfce87d059d1c9; classtype:command-and-control; sid:2038894; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_09_16, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_09_16, reviewed_at 2024_12_24;)