ET DELETED Hash - Suspected Cobalt Strike Malleable C2 (ja3s) M1

Query · suricata

flow:established,from_server;
ja3s.hash;
content:"649d6810e8392f63dc311eecb6b7098b";
tls.cert_subject;
content:!"servicebus.windows.net";
flowbits:isset,ET.cobaltstrike.ja3;

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

Raw source ET DELETED Hash - Suspected Cobalt Strike Malleable C2 (ja3s) M1 · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
#alert tls $EXTERNAL_NET [!25,!587] -> $HOME_NET any (
#    msg:"ET DELETED Hash - Suspected Cobalt Strike Malleable C2 (ja3s) M1";
#    flow:established,from_server;
#    ja3s.hash;
#    content:"649d6810e8392f63dc311eecb6b7098b";
#    tls.cert_subject;
#    content:!"servicebus.windows.net";
#    flowbits:isset,ET.cobaltstrike.ja3;
#    classtype:command-and-control;
#    sid:2028832; rev:4;
#    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_10_15, deployment Perimeter, malware_family Cobalt_Strike, malware_family Cobalt_Strike, signature_severity Major, updated_at 2023_02_16, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation;
#)

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