Integrity Protection Driver stops attackers from installing some kinds of root kits (root kits are used to hide an attackers presence on a compromised system).
However Integrity Protection Driver doesn't load until 20 minutes after boot, if an attacker changes the system time he/she is able to bypass Integrity Protection Driver and install the root kit anyway.
Also information has been released about how to circumvent the protection of \Device\PhysicalMemory, by using the kernel function NtCreateSymbolicLinkObject to create an alternate name for \Device\PhysicalMemory, it is still possible to access it.
Solution: There isn't any easy workaround, also a malicious person can cause a lot of trouble even if he can't install his rootkit, he may even be able to uninstall Integrity Protection Driver.
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Subject: Integrity Protection Driver time bypass
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