csrss.exe is a application which is most likely legit. So, if csrss.exe is on your PC, it is most likely ok, and will NOT be a cause for concern. Even if your system is clean, it is still recommended to use a good antivirus with a good detection rate, in order to defend your PC against threats.
Usually, this program is found in C:\Windows\System32\csrss.exe.
The MD5 fingerprint for this executable is 3e7ccd0f507877c50078205667ce8133.
This application is NOT registered as a Windows service. This is good.
csrss.exe seems to have something to do with Windows SFC (System File Checker) or Windows File Protection.
This is a 64-bit executable. It runs using the full capacity of modern computer processors.
csrss.exe appears to have visible windows. This means it doesn't operate in some kind of stealth mode. Its operation is clearly displayed to you.
csrss.exe is digitally signed. Today most virus-free programs are digitally signed.
The digital signature attached to csrss.exe is valid. This is most likely a clean, ok program.
Digital certificate name: Microsoft Windows Publisher
Certificate's issuer name: Microsoft Windows Production PCA 2011
This program does NOT have a removal routine stored in registry.