ET EXPLOIT_KIT RedKit/Sakura/CritX/SafePack/FlashPack applet + obfuscated URL Apr 10 2013

Query · suricata

flow:established,from_server;
file_data;
content:"<applet"; nocase;
pcre:"/^((?!(?i:<\/applet>)).)+?(?i:value)[\r\n\s]*=[\r\n\s]*\x5c?[\x22\x27](?!http\x3a\/\/)(?P<h>[^\x22\x27])(?P<t>(?!(?P=h))[^\x22\x27])(?P=t)[^\x22\x27]{2}(?P<slash>(?!((?P=h)|(?P=t)))[^\x22\x27])(?P=slash)[^\x22\x27]+(?P=slash)/Rs";
Raw source ET EXPLOIT_KIT RedKit/Sakura/CritX/SafePack/FlashPack applet + obfuscated URL Apr 10 2013 · 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 EXPLOIT_KIT RedKit/Sakura/CritX/SafePack/FlashPack applet + obfuscated URL Apr 10 2013";
    flow:established,from_server;
    file_data;
    content:"<applet"; nocase;
    pcre:"/^((?!(?i:<\/applet>)).)+?(?i:value)[\r\n\s]*=[\r\n\s]*\x5c?[\x22\x27](?!http\x3a\/\/)(?P<h>[^\x22\x27])(?P<t>(?!(?P=h))[^\x22\x27])(?P=t)[^\x22\x27]{2}(?P<slash>(?!((?P=h)|(?P=t)))[^\x22\x27])(?P=slash)[^\x22\x27]+(?P=slash)/Rs";
    classtype:exploit-kit;
    sid:2016751; rev:10;
    metadata:created_at 2013_04_12, signature_severity Major, updated_at 2019_07_26, mitre_tactic_id TA0005, mitre_tactic_name Defense_Evasion, mitre_technique_id T1027, mitre_technique_name Obfuscated_Files_or_Information;
)

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