alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE TigerHunter DOTM CnC Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/index.php?"; startswith; content:"os="; pcre:"/^\d+\.\d+\.\d{3,5}/UR"; content:"name="; content:"ip=_"; fast_pattern; reference:md5,00e6e9ed4666623860686c123ed334f0; reference:md5,2c0db5d995d997a7687f527c493b4c89; classtype:trojan-activity; sid:2039024; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_09_28, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_09_28;)