ET HUNTING Suspicious Quotation Mark Usage in FTP Username

Query · suricata

flow:established,to_server;
content:"USER "; depth:5;
content:"|22|"; distance:0;
pcre:"/^USER [^\r\n]*?\x22/";
Raw source ET HUNTING Suspicious Quotation Mark Usage in FTP Username · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (
    msg:"ET HUNTING Suspicious Quotation Mark Usage in FTP Username";
    flow:established,to_server;
    content:"USER "; depth:5;
    content:"|22|"; distance:0;
    pcre:"/^USER [^\r\n]*?\x22/";
    reference:url,www.checkpoint.com/defense/advisories/public/2010/sbp-16-Aug.html;
    classtype:bad-unknown;
    sid:2011488; rev:3;
    metadata:created_at 2010_09_29, confidence Medium, signature_severity Informational, updated_at 2020_08_19;
)

Detection rules belong to the projects that publish them and remain under their own licenses. This site indexes and links to them; it claims no rights in them.