...since user mode applications all run in their own memory space, the... - dofaq.co
rootkit

...since user mode applications all run in their own memory space, the...

wikipedia - 09 Nov 2020
...since user mode applications all run in their own memory space, the rootkit needs to perform this patching in the memory space of every running application. In addition, the rootkit needs to monitor the system for any new applications that execute and patch those programs' memory space before they fully execute.

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