ET INFO 404/Snake/Matiex Keylogger Style External IP Check

Query · suricata

flow:established,to_server;
http.start;
content:"GET / HTTP/1.1|0d 0a|User-Agent|3a 20|Mozilla/4.0 (compatible|3b 20|MSIE 6.0|3b 20|Windows NT 5.2|3b 20|.NET CLR1.0.3705|3b|)|0d 0a|Host|3a 20|checkip.dyndns.org|0d 0a|Connection|3a 20|Keep-Alive|0d 0a 0d 0a|"; bsize:151; fast_pattern;
target:src_ip;
Raw source ET INFO 404/Snake/Matiex Keylogger Style External IP Check · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET INFO 404/Snake/Matiex Keylogger Style External IP Check";
    flow:established,to_server;
    http.start;
    content:"GET / HTTP/1.1|0d 0a|User-Agent|3a 20|Mozilla/4.0 (compatible|3b 20|MSIE 6.0|3b 20|Windows NT 5.2|3b 20|.NET CLR1.0.3705|3b|)|0d 0a|Host|3a 20|checkip.dyndns.org|0d 0a|Connection|3a 20|Keep-Alive|0d 0a 0d 0a|"; bsize:151; fast_pattern;
    reference:md5,017e7b6b886cce51eb03ce097c1a4c80;
    classtype:external-ip-check;
    sid:2039190; rev:3;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_05_13, deployment Perimeter, malware_family 404Keylogger, confidence High, signature_severity Informational, updated_at 2023_05_24;
    target:src_ip;
)

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