ET MALWARE StealC v2 CnC Server Response

Query · suricata

flow:established,to_client;
flowbits:isset,ET.StealC.v2;
http.response_body;
content:"ey"; startswith;
content:"CIsIm9wY29kZSI6In"; distance:0; fast_pattern;
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 StealC v2 CnC Server 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 StealC v2 CnC Server Response";
    flow:established,to_client;
    flowbits:isset,ET.StealC.v2;
    http.response_body;
    content:"ey"; startswith;
    content:"CIsIm9wY29kZSI6In"; distance:0; fast_pattern;
    classtype:command-and-control;
    sid:2061451; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2025_04_11, deployment Perimeter, malware_family Stealc, confidence High, signature_severity Critical, tag c2, updated_at 2025_04_11, 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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