alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (msg:"ET EXPLOIT RUIJIE NBR/RGNBR Command Injection Attempt Inbound M1"; flow:established,to_server; http.uri; content:"/wget_test.asp?"; fast_pattern; content:"="; distance:0; within:5; pcre:"/^(?:\x3b|\x0a|\x26|\x60|\x7C|\x24)/R"; classtype:attempted-admin; sid:2034161; rev:1; metadata:attack_target Server, created_at 2021_10_09, deployment Perimeter, deployment Internal, confidence High, signature_severity Major, tag Exploit, updated_at 2021_10_09, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;)