ET RETIRED Earth Lusca/SprySOCKS CnC Checkin

Query · suricata

flow:established,to_server;
content:"|bc bc ac ac|"; fast_pattern; offset:4; depth:4;
byte_jump:4,0,relative, post_offset -1;
isdataat:!2,relative;
target:src_ip;
Raw source ET RETIRED Earth Lusca/SprySOCKS CnC 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 RETIRED Earth Lusca/SprySOCKS CnC Checkin";
    flow:established,to_server;
    content:"|bc bc ac ac|"; fast_pattern; offset:4; depth:4;
    byte_jump:4,0,relative, post_offset -1;
    isdataat:!2,relative;
    reference:url,www.trendmicro.com/en_us/research/23/i/earth-lusca-employs-new-linux-backdoor.html;
    classtype:trojan-activity;
    sid:2048118; rev:3;
    metadata:affected_product Linux, attack_target Client_and_Server, created_at 2023_09_19, deployment Perimeter, former_category MALWARE, malware_family SprySOCKS, performance_impact Moderate, confidence Medium, signature_severity Major, updated_at 2025_04_17, reviewed_at 2025_04_17;
    target:src_ip;
)

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