ET MALWARE NewBot Loader CnC Checkin

Query · suricata

flow:established,to_server;
pcre:"/^[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{2}/";
content:"|04 00 00 00|"; offset:24;
content:"|00 00 02 00 00 00 24|"; fast_pattern; distance:2; within:9;
pcre:"/^[a-f0-9]{8}-([a-f0-9]{4}-){3}[a-f0-9]{12}/R";
content:"|18|Microsoft|20|Windows|20|"; within:150;
byte_jump:2,28,little,from_beginning,post_offset 31;
isdataat:!2,relative;
target:src_ip;
Raw source ET MALWARE NewBot Loader 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 any (
    msg:"ET MALWARE NewBot Loader CnC Checkin";
    flow:established,to_server;
    pcre:"/^[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{2}/";
    content:"|04 00 00 00|"; offset:24;
    content:"|00 00 02 00 00 00 24|"; fast_pattern; distance:2; within:9;
    pcre:"/^[a-f0-9]{8}-([a-f0-9]{4}-){3}[a-f0-9]{12}/R";
    content:"|18|Microsoft|20|Windows|20|"; within:150;
    byte_jump:2,28,little,from_beginning,post_offset 31;
    isdataat:!2,relative;
    reference:url,medium.com/walmartglobaltech/newbot-loader-81e2ba11c793;
    reference:md5,c3197c9638728736a0d0247a9cdc14c5;
    classtype:trojan-activity;
    sid:2051665; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, tls_state plaintext, created_at 2024_03_14, deployment Perimeter, malware_family NewBot_Loader, performance_impact Moderate, confidence High, signature_severity Major, tag NewBot_Loader, updated_at 2024_03_14;
    target:src_ip;
)

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