Hi Renluop,
Rapport blocked attempts to alter browser functions. Altering browser functions is a technique that allows taking over the browser and getting access to your sensitive information. This technique is used by malware but also by some legitimate software. Rapport blocks suspicious attempts to alter browser functions regardless of their origin. NtProtectVirtualMemory is just another one of the many browser functions that may be altered in order to take over the browser.
This does not necessarily mean that you have malware on your PC. By blocking these attempts Rapport protects you whether the attempt was made by malware or by legitimate software. There is nothing you need to do with regard to these events as Rapport protects you from any potential threat by blocking the execution of these alterations.
If the activity report presents hundreds of these events, please report a problem from the Rapport console and let us know about this, so we can check if this is malicious software or legitimate software that may need to be approved by Rapport.
Best Regards,
Trusteer Technical Support team