ET WEB_CLIENT Microsoft Rich Text File .RTF File download with invalid listoverridecount

Query · suricata

flow:from_server,established;
file_data;
content:"|5c|listoverridetable"; distance:0;
content:"|5c|listoverride|5c|"; fast_pattern;
content:"|5c|listoverridecount";
isdataat:2,relative;
pcre:"/^(?:0*?[19]\d|[^190])/R";
Raw source ET WEB_CLIENT Microsoft Rich Text File .RTF File download with invalid listoverridecount · Suricata
Esc
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 Microsoft Rich Text File .RTF File download with invalid listoverridecount";
    flow:from_server,established;
    file_data;
    content:"|5c|listoverridetable"; distance:0;
    content:"|5c|listoverride|5c|"; fast_pattern;
    content:"|5c|listoverridecount";
    isdataat:2,relative;
    pcre:"/^(?:0*?[19]\d|[^190])/R";
    reference:cve,2012-2539;
    classtype:attempted-user;
    sid:2018315; rev:6;
    metadata:affected_product Web_Browsers, affected_product Web_Browser_Plugins, attack_target Client_Endpoint, created_at 2012_12_12, cve CVE_2012_2539, deployment Perimeter, signature_severity Major, tag Web_Client_Attacks, updated_at 2019_10_08;
)

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.