ET WEB_CLIENT Hostile Microsoft Rich Text File (RTF) with corrupted listoverride

Query · suricata

flow:from_server,established;
flowbits:set,ETPRO.RTF;
content:"|7b 5c 2a 5c|listoverridetable";
content:"|5c|listoverride|5c|"; fast_pattern;
pcre:"/\x5clistoverride\x5c((?!\x5cls\d{1,4}\s*\}).)+?\x5clistoverride\x5c/s";

Rule dependencies

Feeds into

Raw source ET WEB_CLIENT Hostile Microsoft Rich Text File (RTF) with corrupted listoverride · 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 Hostile Microsoft Rich Text File (RTF) with corrupted listoverride";
    flow:from_server,established;
    flowbits:set,ETPRO.RTF;
    content:"|7b 5c 2a 5c|listoverridetable";
    content:"|5c|listoverride|5c|"; fast_pattern;
    pcre:"/\x5clistoverride\x5c((?!\x5cls\d{1,4}\s*\}).)+?\x5clistoverride\x5c/s";
    reference:cve,2012-0183;
    classtype:attempted-user;
    sid:2025085; rev:3;
    metadata:affected_product Web_Browsers, affected_product Web_Browser_Plugins, attack_target Client_Endpoint, created_at 2012_05_08, cve CVE_2012_0183, deployment Perimeter, signature_severity Major, tag Web_Client_Attacks, updated_at 2019_10_08;
)

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