ET MALWARE Kriptovor External IP Lookup checkip.dyndns.org

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Kriptovor External IP Lookup checkip.dyndns.org";
    flow:established,to_server;
    urilen:1;
    http.method;
    content:"GET";
    http.header;
    content:"Host|3a 20|checkip.dyndns.org|0d 0a|"; depth:26; fast_pattern;
    http.user_agent;
    content:"Mozilla/5.0 (Windows|3b 20|U|3b 20|Windows NT 5.1|3b 20|en-US|3b 20|rv:x.xx) Gecko/20030504 Mozilla Firebird/0.6"; depth:92;
    http.header_names;
    content:!"Referer|0d 0a|";
    content:!"Connection|0d 0a|";
    reference:url,fireeye.com/blog/threat-research/2015/04/analysis_of_kriptovo.html;
    reference:md5,00e3b69b18bfad7980c1621256ee10fa;
    classtype:external-ip-check;
    sid:2020886; rev:8;
    metadata:attack_target Client_Endpoint, created_at 2015_04_09, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, updated_at 2024_11_26, mitre_tactic_id TA0007, mitre_tactic_name Discovery, mitre_technique_id T1614, mitre_technique_name System_Location_Discovery;
)