ET PHISHING Observed Tycoon 2FA Analysis Evasion

Query · suricata

flow:established,to_client;
http.response_body;
content:"|2e|includes|28 22|Burp|22 29|";
content:"|7b 20|keyCode|3a 20|123|20 7d 2c|";
content:"|7b 20|ctrl|3a 20|true|2c 20|keyCode|3a 20|85|20 7d|"; fast_pattern;
content:"|7b 20|ctrl|3a 20|true|2c 20|shift|3a 20|true|2c 20|keyCode|3a 20|";
pcre:"/^(?:73|67|74|75|85)/R";
target:dest_ip;
Raw source ET PHISHING Observed Tycoon 2FA Analysis Evasion · 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 PHISHING Observed Tycoon 2FA Analysis Evasion";
    flow:established,to_client;
    http.response_body;
    content:"|2e|includes|28 22|Burp|22 29|";
    content:"|7b 20|keyCode|3a 20|123|20 7d 2c|";
    content:"|7b 20|ctrl|3a 20|true|2c 20|keyCode|3a 20|85|20 7d|"; fast_pattern;
    content:"|7b 20|ctrl|3a 20|true|2c 20|shift|3a 20|true|2c 20|keyCode|3a 20|";
    pcre:"/^(?:73|67|74|75|85)/R";
    reference:url,proofpoint.com/us/blog/email-and-cloud-threats/tycoon-2fa-phishing-kit-mfa-bypass;
    classtype:credential-theft;
    sid:2065673; rev:2;
    metadata:attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2025_11_05, deployment Perimeter, deployment SSLDecrypt, signature_severity Critical, tag Phishing, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_01_29, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1566, mitre_technique_name Phishing;
    target:dest_ip;
)

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