ET WEB_CLIENT Possible Microsoft Internet Explorer URI Validation Remote Code Execution Attempt

Query · suricata

flow:established,to_client;
content:"#|3A|../../";
content:"C|3A 5C|"; nocase; within:50;
pcre:"/\x2E\x2E\x2F\x2E\x2E\x2F.+C\x3A\x5C[a-z]/si";
Raw source ET WEB_CLIENT Possible Microsoft Internet Explorer URI Validation Remote Code Execution Attempt · Suricata
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Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET WEB_CLIENT Possible Microsoft Internet Explorer URI Validation Remote Code Execution Attempt";
    flow:established,to_client;
    content:"#|3A|../../";
    content:"C|3A 5C|"; nocase; within:50;
    pcre:"/\x2E\x2E\x2F\x2E\x2E\x2F.+C\x3A\x5C[a-z]/si";
    reference:url,www.securityfocus.com/bid/37884;
    reference:cve,2010-0027;
    classtype:attempted-user;
    sid:2010798; rev:5;
    metadata:affected_product Web_Browsers, affected_product Web_Browser_Plugins, attack_target Client_Endpoint, created_at 2010_07_30, deployment Perimeter, confidence Medium, signature_severity Major, tag Web_Client_Attacks, updated_at 2019_09_27, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
)

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