alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (msg:"ET EXPLOIT Solarwinds Serv-U Directory Traversal Attempt Inbound (CVE-2024-28995)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/?InternalDir="; fast_pattern; pcre:"/^.{0,10}(?:\x2f|\x5c|%5[Cc]|%2[Ff])?(?:(?:\x2e|%2[Ee]){1,2}(?:\x2f|\x5c|%5[Cc]|%2[Ff]){1,}){2,}/R"; content:"&InternalFile="; reference:url,www.labs.greynoise.io/grimoire/2024-06-solarwinds-serv-u/; reference:cve,2024-28995; classtype:attempted-admin; sid:2053801; rev:2; metadata:affected_product SolarWinds, created_at 2024_06_23, cve CVE_2024_28995, deployment Perimeter, deployment Internal, confidence High, signature_severity Major, tag CISA_KEV, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_10_04, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)