ET MALWARE FSB Snake CnC Activity Inbound via TCP (AA23-129A) M3

Query · suricata

flow:established,to_client;
content:"|00 00 00 04|"; startswith;
dsize:4;
flowbits:isset,snake-b8;
flowbits:unset,snake-b8;
flowbits:set,snake-b41;
flowbits:noalert;

Rule dependencies

⚠ Higher-order rule. It fires on other rules' alerts, not on raw events, so it cannot fire on its own. Deploy the rules it depends on too.

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Raw source ET MALWARE FSB Snake CnC Activity Inbound via TCP (AA23-129A) M3 · 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 $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE FSB Snake CnC Activity Inbound via TCP (AA23-129A) M3";
    flow:established,to_client;
    content:"|00 00 00 04|"; startswith;
    dsize:4;
    flowbits:isset,snake-b8;
    flowbits:unset,snake-b8;
    flowbits:set,snake-b41;
    flowbits:noalert;
    reference:url,cisa.gov/news-events/cybersecurity-advisories/aa23-129a;
    classtype:command-and-control;
    sid:2045642; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_05_11, deployment Perimeter, malware_family Snake, performance_impact Moderate, confidence Medium, signature_severity Major, tag AA23_129A, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_05_11;
)

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