ET MALWARE Mystic Stealer C2 Client Hello Packet

Query · suricata

flow:established,to_server;
content:"|b5 19 6f 94|"; fast_pattern;
dsize:4;
stream_size:client,=,5;
stream_size:server,=,1;
flowbits:set, mystic_stealer_conn_init;

Rule dependencies

Feeds into

  • 1 rule read mystic_stealer_conn_init · view all
Raw source ET MALWARE Mystic Stealer C2 Client Hello Packet · 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 Mystic Stealer C2 Client Hello Packet";
    flow:established,to_server;
    content:"|b5 19 6f 94|"; fast_pattern;
    dsize:4;
    stream_size:client,=,5;
    stream_size:server,=,1;
    flowbits:set, mystic_stealer_conn_init;
    reference:md5,df80b1e50cfebb0c4dbf5ac51c5d7254;
    reference:url,inquest.net/blog/2023/06/15/mystic-stealer-new-kid-block;
    reference:url,www.zscaler.com/blogs/security-research/mystic-stealer;
    classtype:trojan-activity;
    sid:2046294; rev:3;
    metadata:attack_target Client_Endpoint, created_at 2023_06_16, deployment Perimeter, malware_family Mystic, confidence High, signature_severity Major, tag Stealer, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_01_31;
)

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