ET EXPLOIT_KIT Obfuscated LordEK Landing M1

Query · suricata

flow:established,from_server;
http.stat_code;
content:"200";
file.data;
content:"<html>|0d 0a|<head>|0d 0a|<|2f|head>|0d 0a|<body>|0d 0a 20 20 20 20|<script>|0d 0a|var|20|"; depth:60; fast_pattern;
pcre:"/^(?P<vars>[a-z0-9]{1,20})\s*=\s*new\s*Array\x3b\r\n(?:(?P=vars)\[\d{1,3}\]\s*=\s*\d{4,12}\x3b\r\n){5,40}/Ri";
content:"String.fromCharCode|28|"; nocase;
content:"document.write|28|"; nocase;
Raw source ET EXPLOIT_KIT Obfuscated LordEK Landing M1 · 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 Obfuscated LordEK Landing M1";
    flow:established,from_server;
    http.stat_code;
    content:"200";
    file.data;
    content:"<html>|0d 0a|<head>|0d 0a|<|2f|head>|0d 0a|<body>|0d 0a 20 20 20 20|<script>|0d 0a|var|20|"; depth:60; fast_pattern;
    pcre:"/^(?P<vars>[a-z0-9]{1,20})\s*=\s*new\s*Array\x3b\r\n(?:(?P=vars)\[\d{1,3}\]\s*=\s*\d{4,12}\x3b\r\n){5,40}/Ri";
    content:"String.fromCharCode|28|"; nocase;
    content:"document.write|28|"; nocase;
    reference:url,www.malware-traffic-analysis.net/2019/08/01/index.html;
    classtype:exploit-kit;
    sid:2027787; rev:3;
    metadata:created_at 2019_08_02, deployment Perimeter, malware_family LordEK, performance_impact Low, confidence High, signature_severity Major, tag Exploit_Kit, updated_at 2020_08_31, mitre_tactic_id TA0005, mitre_tactic_name Defense_Evasion, mitre_technique_id T1027, mitre_technique_name Obfuscated_Files_or_Information;
)

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