From the first two Google search results for "lsass":
lsass - lsass.exe - Process Information
Process File: lsass or lsass.exe
Process Name: Local Security Authority Service
Description: The Windows Local Security Authority Server Process Handles
Windows Security Mechanisms. It verifies the validity of user logons to your
PC/Server .Technically it generates the process that is responsible for
authenticating users for the Winlogon service.
Company: Microsoft Corp.
System Process: Yes
Security Risk ( Virus/Trojan/Worm/Adware/Spyware ): No
Common Errors: N/A
Memory Usage by the Lsass.exe Process on Windows 2000 Server-Based Domain
Controllers
View products that this article applies to.
This article was previously published under Q308356
SUMMARY
This article describes some Lsass.exe process basics, best practices for the
configuration of the Lsass.exe process, and expectations of memory usage.
This article should be used as a guide in the analysis of Lsass.exe
performance and memory use on Windows 2000 Server family-based domain
controllers. The information in this article may be useful if you have
questions about how to tune and configure servers and domain controllers to
optimize this engine.
The Lsass.exe process is responsible for management of local security
authority domain authentication and Active Directory management. This
process handles authentication for both the client and the server, and it
also governs the Active Directory engine. The Lsass.exe process is
responsible for the following components:
a.. Local Security Authority
b.. Net Logon service
c.. Security Accounts Manager service
d.. LSA Server service
e.. Secure Sockets Layer (SSL)
f.. Kerberos v5 authentication protocol
g.. NTLM authentication protocol
Now, there is a trojan named "rcp lsass.exe". Make sure that it isn't that.
It normally wouldn't ask for permission to access the internet. It's a
frequent target of syware and malware. Do an up to date AV scan on your
machine and spyware scans with AdAware and Spybot Search&Destroy.
It normally wouldn't ask for permission to access the internet. It's a
frequent target of syware and malware. Do an up to date AV scan on your
machine and spyware scans with AdAware and Spybot Search&Destroy.
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