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Widely Used Daemon Tools Disk App Backdoored in Monthlong Supply-Chain Attack

Kaspersky said the attack can still deliver malware to thousands of Windows computers through a compromised software update.

  • Kaspersky identified a supply-chain attack involving trojanized Daemon Tools installers for Windows, which has remained active since April 8 and impacted thousands of systems globally.
  • Hackers linked to a Chinese-language speaking group compromised official software installers to deliver malicious payloads; this follows similar 'supply chain' attacks targeting Notepad++ and CPU-Z.
  • The malware deploys an information stealer, while a more complex backdoor dubbed QUIC RAT targets government, scientific, and manufacturing organizations in Russia, Belarus, and Thailand.
  • Disc Soft, the developer of Daemon Tools, is investigating the report, while Kaspersky urges users to scan their machines for abnormal activity occurring on or after April 8.
  • Supply-Chain attacks continue to threaten organizations through compromised software updates, with Kaspersky warning that the campaign remains "still active" and poses ongoing risk.
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Daemon Tools, a popular application for mounting disk images, was at the center of an attack on the supply chain that distributed malicious updates for about a month from its developer's own servers, compromising thousands of computers and allowing the installation of back doors on selected targets. *** Kaspersky indicated that versions 12.5.0.2421 to 12.5.0.2434 of Daemon Tools were distributed with malware from official channels. The campaign …

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Heise broke the news in Germany on Tuesday, May 5, 2026.
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