ET MALWARE njRAT/Bladabindi Variant (Lime) CnC Checkin

Query · suricata

flow:established,to_server;
dsize:<250;
content:"|00|ll"; within:6;
content:"TGltZV8"; within:30; fast_pattern;
pcre:"/^[0-9]{2,3}\x00\x6c\x6c(?P<var>[\x20-\x2f\x30-\x39\x3a-\x40\x5b-\x60\x7b-\x7e][\x20-\x7e]+?[\x20-\x2f\x30-\x39\x3a-\x40\x5b-\x60\x7b-\x7e])(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})(?P=var)[^\r\n]+(?P=var)$/s";
Raw source ET MALWARE njRAT/Bladabindi Variant (Lime) CnC Checkin · Suricata
Esc
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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE njRAT/Bladabindi Variant (Lime) CnC Checkin";
    flow:established,to_server;
    dsize:<250;
    content:"|00|ll"; within:6;
    content:"TGltZV8"; within:30; fast_pattern;
    pcre:"/^[0-9]{2,3}\x00\x6c\x6c(?P<var>[\x20-\x2f\x30-\x39\x3a-\x40\x5b-\x60\x7b-\x7e][\x20-\x7e]+?[\x20-\x2f\x30-\x39\x3a-\x40\x5b-\x60\x7b-\x7e])(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})(?P=var)[^\r\n]+(?P=var)$/s";
    reference:md5,ce37b5b473377810bc76e0491533b4e7;
    classtype:command-and-control;
    sid:2025136; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_12_06, deployment Perimeter, malware_family njrat, performance_impact Moderate, confidence Medium, signature_severity Major, updated_at 2020_08_19;
)

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