ET MALWARE MixShell CnC Activity Response

Query · suricata

flow:established,to_client;
flowbits:isset,ET.MixShell.herokuapp;
content:"Server|3a 20|Heroku"; fast_pattern;
http.response_body;
pcre:"/^(?:[a-z0-9]{15,200})\x01\x00$/";
target:dest_ip;

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 MALWARE MixShell CnC Activity Response · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE MixShell CnC Activity Response";
    flow:established,to_client;
    flowbits:isset,ET.MixShell.herokuapp;
    content:"Server|3a 20|Heroku"; fast_pattern;
    http.response_body;
    pcre:"/^(?:[a-z0-9]{15,200})\x01\x00$/";
    reference:url,research.checkpoint.com/2025/zipline-phishing-campaign;
    classtype:command-and-control;
    sid:2069096; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_04_30, deployment Perimeter, deployment SSLDecrypt, malware_family MixShell, confidence High, signature_severity Critical, tag c2, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_04_30, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;
    target:dest_ip;
)

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