alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (msg:"ET EXPLOIT Apache HTTP Server - Path Traversal Attempt (CVE-2021-42013) M2"; flow:established,to_server; content:"/%%32%65%%32%65/"; fast_pattern; http.uri; pcre:"/^\/(?:icons|cgi-bin)/"; http.uri.raw; content:"/%%32%65%%32%65/"; reference:cve,2021-42013; classtype:attempted-admin; sid:2034173; rev:2; metadata:created_at 2021_10_09, cve CVE_2021_42013, deployment Perimeter, deployment Internal, confidence High, signature_severity Major, tag CISA_KEV, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_10_12, mitre_tactic_id TA0007, mitre_tactic_name Discovery, mitre_technique_id T1083, mitre_technique_name File_And_Directory_Discovery; target:dest_ip;)