ET MALWARE [ANY.RUN] NjRat (tXRAT v.2.3R) Client Sends Check-in Packet

Query · suricata

flow:established,to_server;
content:"tXInfoClient|7c|"; offset:3; depth:20; fast_pattern;
pcre:"/^\d{2,4}\x00/";
byte_jump:0,0,string,dec;
isdataat:!2,relative;
Raw source ET MALWARE [ANY.RUN] NjRat (tXRAT v.2.3R) Client Sends Check-in Packet · 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 [ANY.RUN] NjRat (tXRAT v.2.3R) Client Sends Check-in Packet";
    flow:established,to_server;
    content:"tXInfoClient|7c|"; offset:3; depth:20; fast_pattern;
    pcre:"/^\d{2,4}\x00/";
    byte_jump:0,0,string,dec;
    isdataat:!2,relative;
    reference:md5,917d3bcc7cbe4668fa22b8bc2f0a4092;
    reference:url,community.emergingthreats.net/t/njrat-variant-txrat-v-2-3r;
    reference:url,checkpoint.com/cyber-hub/threat-prevention/what-is-malware/what-is-njrat-malware/;
    classtype:command-and-control;
    sid:2053792; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2024_06_21, deployment Perimeter, malware_family njrat, confidence High, signature_severity Critical, tag RAT, updated_at 2024_06_21, reviewed_at 2025_04_21;
)

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