alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Tick Group Payload - Submitting Encrypted Data to CnC"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/?"; content:"=A1f"; endswith; fast_pattern; http.user_agent; content:"|28|Windows|20|NT|20|6.1|3b 20|WOW64|3b|"; http.request_body; pcre:"/^[a-z0-9/=\+]$/i"; reference:url,blog.trendmicro.com/trendlabs-security-intelligence/operation-endtrade-finding-multi-stage-backdoors-that-tick/; classtype:command-and-control; sid:2029082; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_12_02, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag TickGroup, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_03_24;)