Created the Monday 18 March 2019. Updated 3 years, 10 months ago.
This function is undocumented within
OpenProcess. It can be used to get the PID of CRSS.exe, which is a
SYSTEM process. By default, a process has the
SeDebugPrivilege privilege in their access token disabled.
However, when the process is loaded by a debugger such as OllyDbg or WinDbg, the
SeDebugPrivilege privilege is enabled. If a process is able to open CRSS.exe process, it means that the process
SeDebugPrivilege enabled in the access token, and thus, suggesting that the process is being debugged.
If we call
OpenProcess and pass the ID returned by
CsrGetProcessId, no error will occur if the
SeDebugPrivilege has been set with
The resources provided below are associated links that will give you even more detailed information and research on current evasion technique. It is important to note that, while these resources may be helpful, it is important to exercise caution when following external links. As always, be careful when clicking on links from unknown sources, as they may lead to malicious content.