alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (msg:"ET EXPLOIT [FIREEYE] Suspicious Pulse Secure HTTP Request (CVE-2021-22893) M1"; flow:established,to_server; http.uri; content:"/dana"; depth:7; fast_pattern; pcre:"/^\S{0,7}\/(?:meeting|fb\/smb|namedusers|metric)/Ri"; content:!"welcome.cgi"; reference:url,github.com/fireeye/pulsesecure_exploitation_countermeasures; reference:url,www.fireeye.com/blog/threat-research/2021/04/suspected-apt-actors-leverage-bypass-techniques-pulse-secure-zero-day.html; reference:cve,2021-22893; classtype:attempted-admin; sid:2032904; rev:1; metadata:affected_product Pulse_Secure, attack_target Server, created_at 2021_05_05, cve CVE_2021_22893, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Major, tag CISA_KEV, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_05_05;)