alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Backdoor.Randrew.A CnC Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".aspx?A="; fast_pattern; pcre:"/^[A-Z0-9\-]{30,42}$/R"; http.header; content:"Accept-Language|3a 20|zh-TW"; http.header_names; content:"Referer|0d 0a|"; content:!"Cache"; reference:md5,344c04216840312cad17b6610b723825; classtype:command-and-control; sid:2025145; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_12_11, deployment Perimeter, malware_family Randrew_A, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_12_18;)