which system administrator are you talking about?
I also noticed the lsass.exe process taking a ton of cpu-time on my orion server sometimes...
There are also some trojans that can cause this to happen... also if it's a DC:
support.microsoft.com/.../842382
Here is a list of malwares that uses lsass.exe http://www.file.net/process/lsass.exe.html So, malware is also a possibility.
i doubt its a virus/trojan and its not a DC.
Virus scanner is installed and nothing but Solarwinds products have ever been installed on the server, internet security is on high and nobody surfs on that computer.
Have you upgraded to APM 3.5 RC? It should be in your portal now.