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1000's of Audit Failure Logon Attempts to Admin Account

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http://serverfault.com – I was just going through the logs of one of my servers and I noticed there are a ton of failed logon attempts for username Administrator, owner and Admin. I assume that these are bots since there is almost one every second, but my question is what do you normally do about this? I am new to server security, but from what I have been reading most people don't seem too concerned with this type of thing. When you try to remote desktop into a windows system, don't you only have a few tries before being locked out for a bit? I have 63 minutes worth or failed logon attempts every ~1.3 seconds fro (HowTos)

grtyyu's picture
Submitted by grtyyu on 08/13/2012 – Made popular on 08/13/2012

Stories similar to 1000's of Audit Failure Logon Attempts to Admin Account

I've been noticing recurring failed logon attempts onto our SQL server. It happens every minute with the same login. An example from the log file viewer

10/18/2011 13:54:50,Logon,Unknown,Login failed for user 'LOLZOR\lolsqlserver'.

I am getting about 200k of these an hour:

An account failed to log on.

Subject: Security ID: SYSTEM Account Name: TGSERVER$ Account Domain: WORKGROUP Logon ID: 0x3e7

Logon Type: 4

Account For Which Logon Failed: Security ID: NULL SID Account Name: administrator Account Domain: TGSERVER

Failure Information:

I have a Windows 2008R2 server that is reporting failed login attempts from a number of workstations on our network.

I got the following INFO in my event log every 10 sec, any idea what does it mean? and why getting this info?

Windows 2003, managed by 1 user (me) and I only have the account.

Event Log Message:

"Remote session from client name a exceeded the maximum allowed failed logon attempts. The session was forcibly terminated."

I am having a lot of people relentlessly trying to get into my dedicated server via rdp.

I have one ip that was hitting it for 3 hours straight about 5 times a second.

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I want to add these ips to my firewall to prevent further attempts.

Thanks!

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I seem to be getting a lot of these entries in the Security event viewer. Around 8-12 every hour. I am wondering if a) I should be worried about it?