alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (msg:"ET WEB_SPECIFIC_APPS Nette Command Injection Attempt Inbound (CVE-2020-15227)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"nette"; content:"?callback=shell_exec"; distance:0; fast_pattern; reference:url,github.com/hu4wufu/CVE-2020-15227/blob/master/exploit-CVE-2020-15227.py; reference:cve,2020-15227; classtype:attempted-admin; sid:2031222; rev:1; metadata:attack_target Server, created_at 2020_11_19, cve CVE_2020_15227, deployment Perimeter, deployment Internal, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_11_19, mitre_tactic_id TA0008, mitre_tactic_name Lateral_Movement, mitre_technique_id T1210, mitre_technique_name Exploitation_Of_Remote_Services;)