ET MALWARE PurpleFox Backdoor/Rootkit Checkin

Query · suricata

flow:established,to_server;
stream_size:server,<,5;
content:"|37 39 78|"; startswith;
content:"|98 98 98|"; distance:1; within:3;
content:"|98 98|"; distance:2; within:2;
content:"|98 98 98 20 fc|"; distance:1; within:5; fast_pattern;
Raw source ET MALWARE PurpleFox Backdoor/Rootkit 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 $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE PurpleFox Backdoor/Rootkit Checkin";
    flow:established,to_server;
    stream_size:server,<,5;
    content:"|37 39 78|"; startswith;
    content:"|98 98 98|"; distance:1; within:3;
    content:"|98 98|"; distance:2; within:2;
    content:"|98 98 98 20 fc|"; distance:1; within:5; fast_pattern;
    reference:md5,465dae978a41d566c7fabc9f5808487c;
    reference:url,blog.minerva-labs.com/malicious-telegram-installer-drops-purple-fox-rootkit;
    classtype:command-and-control;
    sid:2034873; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_01_10, deployment Perimeter, malware_family PurpleFox, performance_impact Low, confidence High, signature_severity Major, updated_at 2022_01_10;
)

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