ET EXPLOIT [FIREEYE] Suspicious Pulse Secure HTTP Request (CVE-2021-22893) M2

alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (
    msg:"ET EXPLOIT [FIREEYE] Suspicious Pulse Secure HTTP Request (CVE-2021-22893) M2";
    flow:established,to_server;
    http.uri.raw;
    content:"/dana-na/"; depth:11;
    content:"cat%20/home/webserver/htdocs/dana-na/"; nocase; distance:2; within:100; fast_pattern;
    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:2032905; rev:1;
    metadata:affected_product Pulse_Secure, attack_target Networking_Equipment, 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;
)