Malicious browser extensions
5 incidents, 2 live. 17 days since the last new one.
3 drains in the last 12 months
3 drains in the last 12 months
2 drains in 2026
3 drains in 2025
Live
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Medium◐Partly contained
16 fake Rabby and OKX Wallet add-ons on Firefox stole recovery phrases and private keys
Socket found 16 Firefox extensions posing as Rabby Wallet (branded 'Raabby WaIIet') and OKX Wallet ('Portal WALLET'). They captured 12- or 24-word recovery phrases and private keys during the wallet import step and sent them to attacker-run Cloudflare Workers. Mozilla removed them by 5 October 2026, but Socket links them to a crypto-theft extension campaign it first saw in August 2026, so new copies may appear. No loss figure has been published; anyone who imported a seed into one of them should treat that wallet as stolen.
Firefox users who installed fake Rabby Wallet or OKX Wallet add-ons·Multiple EVM chains·Since Oct 5, 2026·
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High◐Partly contained
19 Chrome and Edge extensions hid a wallet drainer that hijacked Connect Wallet and Swap buttons
Socket found 19 Chrome and Edge extensions, from crypto price trackers and explorers to general tools like 'Enable Right Click & Copy' (70,000+ Chrome users), that loaded a modular malware framework. It drained EVM, Solana and Tron wallets by hijacking 'Connect Wallet' and 'Swap' buttons, swapped Ledger and Trezor sites for seed-phishing pages and stole exchange sessions; five extensions were bought from their original developers and turned malicious through updates. Socket thinks the campaign may date back to early 2024. Google removed the Chrome listings, but when BleepingComputer reported it on 30 August 2026 the Edge version of one was still available.
Users of 19 Chrome/Edge extensions incl. 'Enable Right Click & Copy', 'Multi-Chain Explorer' and 'LedgerLook: Wallet Checker'·Multiple EVM chains, Solana, Tron·Since Aug 30, 2026·
Past
December 2025 1
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Critical✓Contained
Trojanized Trust Wallet Chrome extension v2.68 steals seed phrases; $8.5M drained from 2,520 wallets
A malicious version 2.68 of the Trust Wallet browser extension was published to the Chrome Web Store on Dec 24, 2025 with a leaked store API key, skipping the normal release review. It harvested seed phrases through a modified analytics library and sent them to metrics-trustwallet[.]com. Early reports put losses near $7M; Trust Wallet's post-mortem says about $8.5M was drained from 2,520 wallet addresses across BTC, ETH and SOL, and traces the leak to the Shai-Hulud 2.0 npm worm. The fixed v2.69 shipped on Dec 25 and Trust Wallet says it will reimburse affected users; mobile app users were not affected.
Trust Wallet Chrome extension v2.68·Solana, Bitcoin, Ethereum·$8.5M stolen·Since Dec 24, 2025·
August 2025 1
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Malicious 'contractshark.solidity-lang' Cursor extension steals an Ethereum core developer's private key
Cointelegraph reported on 13 August 2025 that an Ethereum core developer's hot wallet was drained after he installed 'contractshark.solidity-lang', a fake Solidity extension for the Cursor AI code editor with over 54,000 downloads. The extension read his .env file and sent the private key to the attacker, who waited three days before emptying the wallet. The loss was a few hundred dollars because he kept only test funds there and his main holdings on hardware wallets. Keep keys out of .env files on development machines and use small, separate test wallets.
Cursor AI code editor users·Ethereum·Since Aug 13, 2025·
July 2025 1
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Fake Solidity extension for the Cursor AI code editor leads to about $500K crypto theft from a developer
Kaspersky reported on 10 July 2025 that a blockchain developer lost about $500,000 in crypto after installing a fake Solidity extension in Cursor, an AI code editor built on VS Code that gets extensions from the Open VSX registry. The extension gave no Solidity support; it installed ScreenConnect remote-access software, then the Quasar backdoor and a stealer that took browser, email and wallet data, including seed phrases. The attackers used the seed phrases to drain the developer's wallets. Developers should vet editor extensions and never keep seed phrases or funded keys on a coding machine.
Cursor AI code editor users (Open VSX extensions)·Multiple EVM chains·$500K stolen·Since Jul 10, 2025·
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