"What happens when cybercriminals stop thinking small and start thinking like a Fortune 500 company?" [1]asks a blog post from Koi Security . "You get GreedyBear , the attack group that just redefined industrial-scale crypto theft."

"150 weaponized Firefox extensions [impersonating popular cryptocurrency wallets like MetaMask and TronLink]. Nearly 500 malicious executables. Dozens of phishing websites. One coordinated attack infrastructure. According to user reports, over $1 million stolen."

> They upload 5-7 innocuous-looking extensions like link sanitizers, YouTube downloaders, and other common utilities with no actual functionality... They post dozens of fake positive reviews for these generic extensions to build credibility. After establishing trust, they "hollow out" the extensions — changing names, icons, and injecting malicious code while keeping the positive review history. This approach allows GreedyBear to bypass marketplace security by appearing legitimate during the initial review process, then weaponizing established extensions that already have user trust and positive ratings. The weaponized extensions captures wallet credentials directly from user input fields within the extension's own popup interface, and exfiltrate them to a remote server controlled by the group...

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> Alongside malware and extensions, the threat group has also launched a network of scam websites posing as crypto-related products and services. These aren't typical phishing pages mimicking login portals — instead, they appear as slick, fake product landing pages advertising digital wallets, hardware devices, or wallet repair services... While these sites vary in design, their purpose appears to be the same: to deceive users into entering personal information, wallet credentials, or payment details — possibly resulting in credential theft, credit card fraud, or both. Some of these domains are active and fully functional, while others may be staged for future activation or targeted scams...

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> A striking aspect of the campaign is its infrastructure consolidation: Almost all domains — across extensions, EXE payloads, and phishing sites — resolve to a single IP address: 185.208.156.66 — this server acts as a central hub for command-and-control, credential collection, ransomware coordination, and scam websites, allowing the attackers to streamline operations across multiple channels... Our analysis of the campaign's code shows clear signs of AI-generated artifacts . This makes it faster and easier than ever for attackers to scale operations, diversify payloads, and evade detection.

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> This isn't a passing trend — it's the new normal.

The researchers believe the group "is likely testing or preparing parallel operations in other marketplaces."



[1] https://blog.koi.security/greedy-bear-massive-crypto-wallet-attack-spans-across-multiple-vectors-3e8628831a05