lsass.exe is a application which is probably NOT a virus or malware. So, if lsass.exe is on your system, it is probably ok, and will NOT cause problems. Even if your PC is virus-free, it is still recommended to purchase a well-known antivirus with a good detection rate, in order to yourself your PC against viruses and malware.
This application is usually stored in C:\Windows\System32\lsass.exe.
The MD5 fingerprint for this file is eabfcda6e996f8a32dc1b302f7683bb2.
This program is registered as a Windows service. This means it runs on your PC in background, usually without showing any user interface to you. Most Windows services are legit programs, which perform 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.
This is a 64-bit executable. It runs using the full capacity of nowadays' computer processors.
lsass.exe has a digital signature. Today the large majority of clean software applications are digitally signed.
The digital signature extracted from lsass.exe checks out perfectly. This is excellent.
Digital certificate name: Microsoft Windows Publisher
Certificate's issuer name: Microsoft Windows Production PCA 2011
This application does NOT have a removal routine set up in registry.