ET MALWARE FSB Snake CnC Activity Inbound via TCP (AA23-129A) M1

Query · suricata

flow:established,to_client;
content:"|00 00 00 08|"; startswith;
dsize:4;
flowbits:isset,snake-a4;
flowbits:unset,snake-a4;
flowbits:set,snake-b81;
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.

Depends on

Feeds into

Raw source ET MALWARE FSB Snake CnC Activity Inbound via TCP (AA23-129A) M1 · 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) M1";
    flow:established,to_client;
    content:"|00 00 00 08|"; startswith;
    dsize:4;
    flowbits:isset,snake-a4;
    flowbits:unset,snake-a4;
    flowbits:set,snake-b81;
    flowbits:noalert;
    reference:url,cisa.gov/news-events/cybersecurity-advisories/aa23-129a;
    classtype:command-and-control;
    sid:2045640; 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;
)

Detection rules belong to the projects that publish them and remain under their own licenses. This site indexes and links to them; it claims no rights in them.