ET INFO Possible Overflow Attempt - Abnormally Large SMTP EHLO Inbound

Query · suricata

flow:established,to_server;
content:"EHLO"; startswith;
isdataat:1000,relative;
Raw source ET INFO Possible Overflow Attempt - Abnormally Large SMTP EHLO Inbound · 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,$SMTP_SERVERS] any (
    msg:"ET INFO Possible Overflow Attempt - Abnormally Large SMTP EHLO Inbound";
    flow:established,to_server;
    content:"EHLO"; startswith;
    isdataat:1000,relative;
    classtype:bad-unknown;
    sid:2032926; rev:2;
    metadata:attack_target SMTP_Server, created_at 2021_05_10, deployment Perimeter, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_05_11;
)

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