ET MALWARE njRAT v65.0 CnC Checkin

Query · suricata

flow:established,to_server;
dsize:<256;
content:"|00 00 00|"; offset:1;
content:"|00 00 00|"; distance:1;
content:"|7c 7c|"; distance:12;
pcre:"/^(?:\d{1,3}\.){3}\d{1,3}\|\|/R";
content:"|7c 7c|Microsoft Windows";
content:"|7c 7c ce de 7c 7c ce de 7c 7c ce de 7c 7c 31 7c 7c|65.0"; fast_pattern; endswith;
Raw source ET MALWARE njRAT v65.0 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-pkt $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE njRAT v65.0 CnC Checkin";
    flow:established,to_server;
    dsize:<256;
    content:"|00 00 00|"; offset:1;
    content:"|00 00 00|"; distance:1;
    content:"|7c 7c|"; distance:12;
    pcre:"/^(?:\d{1,3}\.){3}\d{1,3}\|\|/R";
    content:"|7c 7c|Microsoft Windows";
    content:"|7c 7c ce de 7c 7c ce de 7c 7c ce de 7c 7c 31 7c 7c|65.0"; fast_pattern; endswith;
    reference:md5,008e86fdb755fb073cf629e2a6b8c783;
    classtype:trojan-activity;
    sid:2036933; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_and_Server, created_at 2022_06_08, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_06_08;
)

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