ET EXPLOIT [FIREEYE] Suspicious Pulse Secure HTTP Request (CVE-2021-22893) M3

Query · suricata

flow:established,to_server;
content:"MIME|3a 3a|Base64|3b|"; nocase;
http.uri;
content:"/dana-na/"; depth:11; fast_pattern;
content:!"welcome.cgi";
Raw source ET EXPLOIT [FIREEYE] Suspicious Pulse Secure HTTP Request (CVE-2021-22893) M3 · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (
    msg:"ET EXPLOIT [FIREEYE] Suspicious Pulse Secure HTTP Request (CVE-2021-22893) M3";
    flow:established,to_server;
    content:"MIME|3a 3a|Base64|3b|"; nocase;
    http.uri;
    content:"/dana-na/"; depth:11; 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:trojan-activity;
    sid:2032906; rev:1;
    metadata:affected_product Pulse_Secure, created_at 2021_05_05, cve CVE_2021_22893, confidence High, signature_severity Major, tag CISA_KEV, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_05_05;
)

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