ET MALWARE Win32/Kryptik.GSKY CnC Checkin

Query · suricata

flow:established,to_server;
stream_size:server,<,5;
content:"|45 36 27 18|"; startswith; fast_pattern;
content:"|23|"; distance:0;
content:"Api"; distance:0;
Raw source ET MALWARE Win32/Kryptik.GSKY CnC Checkin · 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 tcp $HOME_NET any -> $EXTERNAL_NET 1024: (
    msg:"ET MALWARE Win32/Kryptik.GSKY CnC Checkin";
    flow:established,to_server;
    stream_size:server,<,5;
    content:"|45 36 27 18|"; startswith; fast_pattern;
    content:"|23|"; distance:0;
    content:"Api"; distance:0;
    reference:md5,0d6118f766b0d75a5085bced64793d76;
    classtype:command-and-control;
    sid:2037822; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_07_25, deployment Perimeter, malware_family Win32_Kryptik_GSKY, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_10_17;
)

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