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Invisible Threats: The Rise of Hangul JavaScript in Phishing Attacks
Juniper Threat Labs discovered a new JavaScript obfuscation technique used in a phishing attack targeting American PAC affiliates. The attack uses the Tycoon 2FA phishing kit and involves invisible JavaScript encoded with Hangul characters. This highlights how swiftly security research can inspire real-world cyber attacks.

Hot Take:
Who knew Hangul characters could be the secret agents of the Unicode world? As if phishing wasn’t slippery enough, now it’s also invisible! The only thing more surprising than this phishing attack is that someone actually decided to call it “Tycoon 2FA.” Sounds more like a high-stakes board game than a cyber threat!
Key Points:
- Juniper Threat Labs detected a phishing attack targeting a major American PAC, using a newly observed JavaScript obfuscation technique.
- The attack employed the Tycoon 2FA phishing kit and personalized information to trick victims.
- The obfuscation technique uses Hangul Unicode characters to encode JavaScript invisibly.
- The technique was first shared by Martin Kleppe on X and quickly adopted by threat actors.
- Juniper provided Python code snippets to decode and investigate the malicious scripts.