Malware writers are developing increasingly sophisticated bugs that attack a computer's direct memory access from a hiding place deep within peripheral components, including graphics and network cards, in an effort to avoid detection. German researcher Patrick Stewin says he has developed a way to root out one such virus once thought undetectable, dubbed DAGGER, which targeted 32-bit and 64-bit Windows and Linux systems. "DMA-based attacks launched from peripherals are capable of compromising the host without exploiting vulnerabilities present in the operating system running on the host," says Stewin. "Therefore they present a highly critical threat to system security and integrity."

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