alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE DirectsX CnC Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"AAAAAAAAAAAAAA"; pcre:"/^\/(?:[A-Z0-9+/]{4})*(?:[A-Z0-9+/]{2}==|[A-Z0-9+/]{3}=|[A-Z0-9+/]{4})$/i"; http.header; content:"X-MU-Session-ID|3a 20|"; fast_pattern; reference:url,public.gdatasoftware.com/Presse/Publikationen/Whitepaper/EN/GDATA_TooHash_CaseStudy_102014_EN_v1.pdf; classtype:command-and-control; sid:2026916; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_02_15, deployment Perimeter, malware_family DirectsX, performance_impact Low, confidence High, signature_severity Major, updated_at 2020_08_27;)