ET MALWARE Remcos 3.x Unencrypted Checkin

Query · suricata

flow:established,to_server;
content:"|24 04 ff 00|"; startswith;
content:"|4b 00 00 00|"; distance:4; within:4;
content:"|7c 1e 1e 1f 7c|"; distance:0; fast_pattern;
Raw source ET MALWARE Remcos 3.x Unencrypted 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 Remcos 3.x Unencrypted Checkin";
    flow:established,to_server;
    content:"|24 04 ff 00|"; startswith;
    content:"|4b 00 00 00|"; distance:4; within:4;
    content:"|7c 1e 1e 1f 7c|"; distance:0; fast_pattern;
    reference:md5,d27f70216d11b769c937a961fc1b1c81;
    classtype:command-and-control;
    sid:2032776; rev:2;
    metadata:attack_target Client_Endpoint, created_at 2021_04_16, deployment Perimeter, malware_family Remcos, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_04_16;
)

Detection rules belong to the projects that publish them and remain under their own licenses. This site indexes and links to them; it claims no rights in them.