Security researchers from Cybellum have discovered another technique cyber criminals can use to take over your computer. The zero-day attack called DoubleAgent exploits Microsoft's Application Verifier tool, which developers use to detect and fix bugs in their apps. Developers have to load a DLL into their applications to check them, and Cybellum's researchers found that hackers can use the tool to inject their own DLLs instead of the one Microsoft provides. In fact, the team proved that the technique can be used to hijack anti-virus applications and turn them into malware. The corrupted app can then be used to take control of computers running any version of Windows from XP to the latest release of Windows 10.