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LSASS to consume CPU Time on Domain Controllers due to Conficker

The problem has to do with LSASS consuming a lot of CPU time on your Domain Controllers (DC’s). The cause of this high CPU turns out to be Conficker infected computers throwing bad passwords against the DC’s. The rate of bad passwords can be as high as 10,000 per minute from multiple clients.As you can imagine, this high CPU usage affects other workflows which are AD dependent – including Exchange/SharePoint/Authentication etc. If you temporarily pull the network cable from the DC and wait a few minutes, LSASS drops back down to ~1% or whatever value is normal in your setup.

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