alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (msg:"ET EXPLOIT D-Link - RCE Attempt Inbound (CVE-2021-45382)"; flow:to_server,established; http.method; content:"POST"; http.uri; content:"/ddns_check.ccp"; fast_pattern; http.request_body; content:"&ddnsHostName="; pcre:"/^(?:\x3b|\x0a|\x26|\x60|\x7c|\x24)/R"; reference:cve,2021-45382; classtype:attempted-admin; sid:2035747; rev:1; metadata:attack_target Networking_Equipment, created_at 2022_04_05, cve CVE_2021_45382, deployment Perimeter, deployment Internal, confidence High, signature_severity Major, tag CISA_KEV, updated_at 2022_04_05;)