Search Evasion Techniques
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RDTSC Anti-Debugging
The Read-Time-Stamp-Counter (RDTSC) instruction can be used by malware to determine how quicky the processor executes the program's instructions. It returns the count of the number of ticks since the last system reboot as a 64-bit value placed into EDX:EAX.
It will execute RDTSC twice and then calculate the difference between low order values and check it with …
RDTSCP Sandbox Evasion
Newer processors support a new instruction called RDTSCP which does the exact same thing as RDTSC, except that it does so serializing (meaning it waits for all instructions to execute before reading the counter. and that the possible reordering of the execution of the instructions is won that does not happen).
This instruction can be used to calculate the …