Rule History

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;)