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Chrome Extension Breach Exposes 500,000 Users to Crypto Key Theft
A malicious update to the widely used Chrome proxy extension SwitchyOmega has been discovered stealing private keys from cryptocurrency wallets, putting over 500,000 users at serious risk, cybersecurity firm SlowMist has reported.
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According to the March 12 security alert, the breach originated from a phishing attack targeting an employee at Cyberhaven, an AI-driven data security company. Attackers sent a deceptive email claiming that Cyberhaven’s browser extension was in violation of Google’s policies and at risk of removal unless immediate action was taken.
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By exploiting this social engineering attack, the hackers compromised Cyberhaven’s OAuth credentials, allowing them to inject malicious code into SwitchyOmega. The infected version (24.10.4) was then uploaded to the Chrome Web Store. As the extension automatically updated, thousands of unsuspecting users unknowingly installed the compromised software—exposing their private keys and mnemonic phrases to potential theft.
While the full extent of the damage remains unclear, SlowMist urges affected users to immediately verify their installed extension IDs against the official version to determine whether they have the tainted release.
This incident highlights a growing cyber threat targeting crypto traders via browser extensions. In September 2024, cybersecurity analysts at Group-IB reported that the Lazarus Group, a North Korean state-backed hacking syndicate, had escalated its focus on browser-based attack vectors, including fake video apps and malicious plugins, to infiltrate the digital asset industry. With cybercriminals increasingly exploiting browser vulnerabilities, SlowMist recommends crypto users conduct regular security audits, enable two-factor authentication, and avoid clicking suspicious links to mitigate risks.
Adding to the surge in cyber threats, Lazarus Group recently launched a supply chain attack deploying six malicious npm packages designed to steal credentials and siphon cryptocurrency data. According to the Socket Research Team, the hackers leveraged BeaverTail malware to infiltrate developer systems and extract sensitive user information.
With browser-based threats on the rise, crypto users must remain vigilant against evolving attack techniques that put digital assets at risk.
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