ET MALWARE FatalRAT CnC Activity

Query · suricata

flow:established,to_server;
stream_size:server,=,1;
content:"|bf bc 95|"; depth:3;
content:"|8e 8e|"; distance:2; within:2;
content:"|8e 8e 2c 1b 80 8e e6 02|"; distance:2; within:8; fast_pattern;
Raw source ET MALWARE FatalRAT CnC Activity · 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-pkt $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE FatalRAT CnC Activity";
    flow:established,to_server;
    stream_size:server,=,1;
    content:"|bf bc 95|"; depth:3;
    content:"|8e 8e|"; distance:2; within:2;
    content:"|8e 8e 2c 1b 80 8e e6 02|"; distance:2; within:8; fast_pattern;
    reference:md5,99fc53d3d4c2c31fd5b5f0f15dbdeab4;
    reference:url,twitter.com/c3rb3ru5d3d53c/status/1400075253695537155;
    classtype:command-and-control;
    sid:2033093; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_06_04, deployment Perimeter, malware_family FatalRAT, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_06_04;
)

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