ET MALWARE Generic njRAT/Bladabindi CnC Activity (ll)

Query · suricata

flow:established,to_server;
dsize:<500;
content:"|00 6c 6c|"; depth:6; fast_pattern;
pcre:"/^[0-9]{2,3}\x00\x6c\x6c(?P<var>[\x20-\x2f\x30-\x39\x3a-\x40\x41-\x5a\x5b-\x60\x7b-\x7e][\x20-\x7e]+?[\x20-\x2f\x30-\x39\x3a-\x40\x41-\x5a\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)$/i";
flowbits:set,ETPRO.njratgeneric;

Rule dependencies

Feeds into

  • Nothing indexed reads ETPRO.njratgeneric.
Raw source ET MALWARE Generic njRAT/Bladabindi CnC Activity (ll) · 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 -> $EXTERNAL_NET !$HTTP_PORTS (
    msg:"ET MALWARE Generic njRAT/Bladabindi CnC Activity (ll)";
    flow:established,to_server;
    dsize:<500;
    content:"|00 6c 6c|"; depth:6; fast_pattern;
    pcre:"/^[0-9]{2,3}\x00\x6c\x6c(?P<var>[\x20-\x2f\x30-\x39\x3a-\x40\x41-\x5a\x5b-\x60\x7b-\x7e][\x20-\x7e]+?[\x20-\x2f\x30-\x39\x3a-\x40\x41-\x5a\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)$/i";
    flowbits:set,ETPRO.njratgeneric;
    reference:md5,d68eaf3b43ba1d26b9067489bbf7ee44;
    classtype:command-and-control;
    sid:2033132; rev:6;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_03_22, deployment Perimeter, malware_family Bladabindi, malware_family njrat, performance_impact Moderate, confidence Medium, signature_severity Major, updated_at 2019_07_26;
)

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