ET EXPLOIT Juniper ScreenOS telnet Backdoor Default Password Attempt

alert tcp any any -> $HOME_NET 23 (
    msg:"ET EXPLOIT Juniper ScreenOS telnet Backdoor Default Password Attempt";
    flow:established,to_server;
    content:"|3c 3c 3c 20 25 73 28 75 6e 3d 27 25 73 27 29 20 3d 20 25 75|"; fast_pattern;
    threshold:type limit, count 1, seconds 60, track by_src;
    reference:cve,2015-7755;
    reference:url,community.rapid7.com/community/infosec/blog/2015/12/20/cve-2015-7755-juniper-screenos-authentication-backdoor;
    classtype:attempted-admin;
    sid:2022291; rev:1;
    metadata:created_at 2015_12_21, cve CVE_2015_7755, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;
)