GPL IMAP unsubscribe literal overflow attempt

Query · suricata

flow:established,to_server;
content:"UNSUBSCRIBE"; nocase;
pcre:"/\sUNSUBSCRIBE\s[^\n]*?\s\{/smi";
byte_test:5,>,256,0,string,dec,relative;
Raw source GPL IMAP unsubscribe literal overflow attempt · 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 143 (
    msg:"GPL IMAP unsubscribe literal overflow attempt";
    flow:established,to_server;
    content:"UNSUBSCRIBE"; nocase;
    pcre:"/\sUNSUBSCRIBE\s[^\n]*?\s\{/smi";
    byte_test:5,>,256,0,string,dec,relative;
    reference:bugtraq,11775;
    classtype:misc-attack;
    sid:2103075; rev:2;
    metadata:created_at 2010_09_23, confidence Medium, signature_severity Minor, updated_at 2019_07_26;
)

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