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Microsoft Discovers New Lightweight Backdoor that Steals Cryptocurrency

Microsoft says the worm copies itself through infected USB drives and steals seed phrases, private keys and wallet addresses before sending them through Tor.

  • On Thursday, Microsoft detailed a new self-propagating Crypto Clipper worm that spreads via USB drives to steal cryptocurrency credentials by monitoring device clipboards and routing traffic through Tor.
  • Infection begins when users open malicious LNK files on USB drives. Microsoft noted, "The execution of this clipper is notable because it does not depend on a traditional installer or exposed IP-based C2 infrastructure."
  • Every half a second, the malware checks the clipboard for 12 or 24-word BIP39 seed phrases and targets Bitcoin, Ethereum, Tron, and Monero wallet addresses to redirect funds.
  • The malware captures five screenshots of the victim's screen every ten seconds, exfiltrating data through a SOCKS5 proxy while connections to "Localhost:9050" signal the campaign.
  • Security teams log 54% of successful attacks but alert on only 14%, making behavioral monitoring of EDR and SIEM rules critical to detecting this threat through unusual PowerShell activity.
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BleepingComputer broke the news in New York, United States on Thursday, June 18, 2026.
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