alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Danabot CnC Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/api/key?k="; depth:11; pcre:"/^(?:[A-Z0-9+/]{4})*(?:[A-Z0-9+/]{2}==|[A-Z0-9+/]{3}=|[A-Z0-9+/]{4})$/Ri"; http.user_agent; content:"Mozilla|20|4.0|20 2f 20|Chrome"; depth:20; fast_pattern; endswith; http.content_type; content:"application|2f|x-www-form-urlencoded"; pcre:"/^[^\x20-\x7e\r\n]{2}$/R"; reference:md5,7f5f7de558fd2ef2a195b3a507c11ff2; classtype:command-and-control; sid:2027497; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, created_at 2019_06_20, deployment Perimeter, malware_family Danabot, performance_impact Low, confidence High, signature_severity Major, updated_at 2020_09_17;)