ET MALWARE Upatre External IP Check

Query · suricata

flow:established,to_server;
urilen:1;
http.method;
content:"GET";
http.host;
content:"checkip.dyndns.org"; fast_pattern;
http.header;
pcre:"/^(?:Accept\x3a\x20text\/\*, application\/\*\r\n)?User-Agent\x3a[^\r\n\x3b\x28\x29]+\r\nHost\x3a[^\r\n]+checkip\.dyndns\.org\r\nCache-Control\x3a[^\r\n]+\r\n(?:\r\n)?$/";
http.header_names;
content:!"Accept-";
content:!"Referer|0d 0a|";
Raw source ET MALWARE Upatre External IP Check · Suricata
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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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Upatre External IP Check";
    flow:established,to_server;
    urilen:1;
    http.method;
    content:"GET";
    http.host;
    content:"checkip.dyndns.org"; fast_pattern;
    http.header;
    pcre:"/^(?:Accept\x3a\x20text\/\*, application\/\*\r\n)?User-Agent\x3a[^\r\n\x3b\x28\x29]+\r\nHost\x3a[^\r\n]+checkip\.dyndns\.org\r\nCache-Control\x3a[^\r\n]+\r\n(?:\r\n)?$/";
    http.header_names;
    content:!"Accept-";
    content:!"Referer|0d 0a|";
    classtype:external-ip-check;
    sid:2020370; rev:6;
    metadata:created_at 2015_02_05, signature_severity Major, updated_at 2020_09_29;
)

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