AI Hackers Steal $1M Crypto with Fake Firefox Extensions in 2025

In 2025, cybercriminals like GreedyBear stole over $1 million in crypto using AI-generated malicious Firefox extensions, exemplifying industrial-scale thefts that have surpassed $2.17 billion this year. AI automates exploits and evades detection, exploiting human errors. Stakeholders must integrate AI defenses and oversight to restore trust in digital assets.
AI Hackers Steal $1M Crypto with Fake Firefox Extensions in 2025
Written by Mike Johnson

In the shadowy underbelly of cryptocurrency, where fortunes can vanish in a digital blink, a new breed of cybercriminal is emerging—one that operates with the precision and scale of a corporate powerhouse. The recent heist by the hacking group known as GreedyBear, which netted over $1 million in stolen crypto, exemplifies this evolution. According to a detailed analysis from Slashdot, the attackers deployed 150 weaponized Firefox extensions, masquerading as legitimate tools for popular cryptocurrency wallets like MetaMask and Phantom. These extensions, crafted with AI-generated code, bypassed marketplace security checks and siphoned funds from unsuspecting users.

What sets this operation apart is its industrial efficiency. GreedyBear didn’t rely on crude phishing or one-off exploits; instead, they automated the theft process using artificial intelligence to generate and deploy malicious code at scale. This approach allowed them to target thousands of users simultaneously, turning what might have been isolated incidents into a systematic plunder. Reports from CryptoNews highlight how the group impersonated trusted brands, luring victims into installing these tainted extensions that quietly drained wallets.

The Rise of AI-Powered Cybercrime

The broader context of 2025’s crypto thefts paints an even grimmer picture. Chainalysis’s mid-year update reveals that over $2.17 billion has already been stolen this year, surpassing the entirety of 2024’s losses, with mega-heists like the $1.5 billion ByBit exploit leading the charge. As detailed in Chainalysis, these incidents often involve sophisticated tactics, including AI agents that automate smart contract vulnerabilities. GreedyBear’s method echoes this trend, using AI to create code that evades detection, much like the “evil automation” described in a report from The Register.

Industry insiders note that AI’s role in generating vulnerable code is a double-edged sword. Veracode’s 2025 GenAI Code Security Report, as covered in WebProNews, warns that 45% of AI-produced code contains flaws like cross-site scripting and injection attacks. Hackers exploit this by rapidly prototyping malicious scripts, accelerating their operations while developers scramble to keep up.

Human Vulnerabilities and Evolving Tactics

Yet, technology alone doesn’t explain the surge; human error remains a critical weak point. Posts on X from security firms like OpenKYT emphasize how criminals are using generative AI and deepfakes to industrialize fraud, infiltrating blockchain ecosystems with custom large language models. This aligns with CrowdStrike’s insights, shared across social platforms, detailing how groups like Famous Chollima employ AI for generating fake resumes and real-time scams to breach companies.

In India, the CoinDCX breach added to the global tally, as reported by The Times of India, underscoring how AI-driven hacks compound traditional vulnerabilities. Crypto.news further explores this in a piece on human errors and AI threats, noting that access control attacks—targeting cloud services and DNS—accounted for over 80% of Q1 2025 losses, totaling nearly $2 billion.

Defensive Strategies and Future Implications

Countermeasures are evolving, but they’re playing catch-up. Smart-contract developers, as interviewed in TradingView News, believe AI can enhance security through automated audits, despite risks of “vibe coding” where rushed AI outputs introduce bugs. Firms like Inference Labs, active on X, promote zk-verified proofs for tamper-proof trading models to combat the $1.5 billion in hacks this year alone.

For exchanges and users, the lesson is clear: robust verification processes and AI-assisted monitoring are essential. The Week’s mid-year update on crypto thefts topping $2.17 billion stresses the need for vigilance, especially as phishing sites now prey on hackers themselves, complicating recovery efforts. As AInvest reported in its analysis of Q1 surges, even seasoned attackers fall victim to spoofed tools, highlighting the chaotic interplay of offense and defense.

The Path Forward for Crypto Security

Ultimately, GreedyBear’s $1 million haul is a harbinger of larger threats. X posts from ChainGPT remind us of historical heists like Ronin ($600 million in 2022), urging AI-powered defenses like CryptoGuard. Veritas Protocol’s warnings on X about access control attacks reinforce that crypto’s growth demands proportional security investments.

As 2025 progresses, with thefts already eclipsing previous records, stakeholders must integrate human oversight with AI tools to fortify systems. The alternative—continued escalation of industrial-scale crimes—could undermine trust in digital assets entirely. Industry leaders are calling for collaborative frameworks, blending regulatory oversight with technological innovation, to outpace these adaptive adversaries.

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