ET MALWARE Possible Linux/Moose Telnet CnC Beacon

Query · suricata

flow:established,to_server;
dsize:40;
content:"|0e 00 00 00|"; offset:4; depth:4; fast_pattern;
content:!"|00|"; within:1;
content:!"|00|"; distance:3; within:1;
content:"|00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00|"; distance:4; within:28;
content:!"|00 00 00 00|"; depth:4;
Raw source ET MALWARE Possible Linux/Moose Telnet CnC Beacon · 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 Possible Linux/Moose Telnet CnC Beacon";
    flow:established,to_server;
    dsize:40;
    content:"|0e 00 00 00|"; offset:4; depth:4; fast_pattern;
    content:!"|00|"; within:1;
    content:!"|00|"; distance:3; within:1;
    content:"|00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00|"; distance:4; within:28;
    content:!"|00 00 00 00|"; depth:4;
    reference:url,welivesecurity.com/wp-content/uploads/2015/05/Dissecting-LinuxMoose.pdf;
    classtype:command-and-control;
    sid:2021149; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2015_05_26, deployment Perimeter, confidence Medium, signature_severity Major, tag c2, updated_at 2019_07_26, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)

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