ET MALWARE APT/Bitter Related CnC Activity

Query · suricata

flow:established,to_server;
stream_size:server,<,5;
content:"|db f6 94 f6 9f f6 82 f6 f6 f6|"; fast_pattern;
content:"|f6 cc f6|"; distance:3; within:3;
content:"|f6 cc f6|"; distance:3; within:3;
content:"|f6 cc f6|"; distance:3; within:3;
content:"|f6 cc f6|"; distance:3; within:3;
content:"|f6 cc f6|"; distance:3; within:3;
content:"|f6 f6 f6|"; distance:3; within:3; endswith;
Raw source ET MALWARE APT/Bitter Related CnC Activity · 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 APT/Bitter Related CnC Activity";
    flow:established,to_server;
    stream_size:server,<,5;
    content:"|db f6 94 f6 9f f6 82 f6 f6 f6|"; fast_pattern;
    content:"|f6 cc f6|"; distance:3; within:3;
    content:"|f6 cc f6|"; distance:3; within:3;
    content:"|f6 cc f6|"; distance:3; within:3;
    content:"|f6 cc f6|"; distance:3; within:3;
    content:"|f6 cc f6|"; distance:3; within:3;
    content:"|f6 f6 f6|"; distance:3; within:3; endswith;
    reference:url,twitter.com/ShadowChasing1/status/1480853604609126403;
    reference:md5,1cdc2c0f6834b37da085c0deb9d3461a;
    classtype:targeted-activity;
    sid:2034909; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_01_13, deployment Perimeter, confidence High, signature_severity Major, tag RAT, updated_at 2022_01_13;
)

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