ET EXPLOIT Possible SolarWinds Serv-U SSH RCE Inbound M1 (CVE-2021-35211)

Query · suricata

flow:established,to_server;
dsize:>150;
content:"SSH-2.0-|0d 0a|"; fast_pattern;
threshold:type threshold, track by_dst, count 10, seconds 30;
Raw source ET EXPLOIT Possible SolarWinds Serv-U SSH RCE Inbound M1 (CVE-2021-35211) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tcp-pkt any any -> [$HOME_NET,$HTTP_SERVERS] 22 (
    msg:"ET EXPLOIT Possible SolarWinds Serv-U SSH RCE Inbound M1 (CVE-2021-35211)";
    flow:established,to_server;
    dsize:>150;
    content:"SSH-2.0-|0d 0a|"; fast_pattern;
    threshold:type threshold, track by_dst, count 10, seconds 30;
    reference:url,microsoft.com/security/blog/2021/09/02/a-deep-dive-into-the-solarwinds-serv-u-ssh-vulnerability/;
    reference:cve,2021-35211;
    classtype:attempted-admin;
    sid:2033893; rev:1;
    metadata:attack_target Server, created_at 2021_09_02, cve CVE_2021_35211, deployment Perimeter, deployment Internal, confidence Medium, signature_severity Major, tag Exploit, tag CISA_KEV, updated_at 2021_09_02, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
)

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