lsass.exe is a application which is probably legit. So, if lsass.exe is on your PC, it is probably ok, and will NOT be a cause for concern. Even if your PC is clean, it is still recommended to use a well-known antivirus with a good detection rate, in order to yourself your PC against potential security problems.
This application is normally stored on disk in C:\Windows\System32\lsass.exe.
The MD5 checksum for this file is ca69e856332e2d85294665f6b7e97254.
This program is a Windows service. This means it operates on your system in background, usually without showing anything to you. Most Windows services are legit programs, which provide useful functions to other applications or to Windows in general.
lsass.exe appears to use the functions of Windows SFC (System File Checker) or Windows File Protection.
64-bit code has been detected. This exe can exploit the full power of a current computer cpu.
lsass.exe has a digital signature. Nowadays most serious software applications are digitally signed.
The digital signature attached to lsass.exe is valid. This is very good.
Digitally signed by: Microsoft Windows
Certificate's issuer name: Microsoft Windows Verification PCA
This application does NOT have an uninstall routine stored in registry.