ET MALWARE Interlock Ransomware Fake Updater CnC Command (Terminate)

Query · suricata

flow:established,to_client;
flowbits:isset,ET.Interlock;
http.stat_code;
content:"200";
http.content_len;
content:"4";
http.response_body; bsize:4;
content:"ooff"; fast_pattern;

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 Interlock Ransomware Fake Updater CnC Command (Terminate) · 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 Interlock Ransomware Fake Updater CnC Command (Terminate)";
    flow:established,to_client;
    flowbits:isset,ET.Interlock;
    http.stat_code;
    content:"200";
    http.content_len;
    content:"4";
    http.response_body; bsize:4;
    content:"ooff"; fast_pattern;
    reference:url,blog.sekoia.io/interlock-ransomware-evolving-under-the-radar/;
    classtype:trojan-activity;
    sid:2062407; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2025_05_16, deployment Perimeter, malware_family Interlock, performance_impact Low, confidence High, signature_severity Critical, updated_at 2025_05_19, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;
)

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