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Hacker or Automated Process?

I was working on my network all this week using remote desktop from several machines as I went back and forth making various updates. I went home and logged into my terminal server from remote desktop and to my horror someone logged in under my credentials and booted me off. I logged back in and booted him off. I shut down my terminal server.

I was using my main active directory administrator password. My firewall has a different password. So i think that is in tact.

I changed my password. It turns out my virus scanner was expired on the terminal server. I updated it and it found 33 viruses and I ran a trojen horse scanner. It appears the server is now clean.

Three ays went by and I am at home again and BOOM it happened again! Iwas booted off by another login using same credentials.

Could this be a hacker or is it an open rdp session that I may have left on at work and it just retries and logs back in?

I changed my admin password before I ran the virus scan. Could it have already broadcasted my new password to whomever may be tracking.

I don't know what to do at this point. Any help would be greatly appreciated. I'm worried other servers could be compromised.
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MEATBALLHERO
Asked:
MEATBALLHERO
2 Solutions
 
Dirk KotteSECommented:
first, disable external access to the server.

next, you should rebuild your server!
it is not possible to find and clean all viruses, trojan horses or intruder installed programs if the hacker knows what he do.

you should prevent using the the "domain\administrator" account for external logins, because this account is never locked out ... so the hacker has unrestricted attempts to gain the password.

you should use a ssl-/webgateway to preauthenticate the user before he reach the rdp-server / RDP over VPN is a option also.

sorry, but i see no simple solution.
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cwstad2Commented:
you can try this

http://gallery.technet.microsoft.com/scriptcenter/PowerShell-script-to-Find-d2ba4252

also if you have an account password lockout policy and you have changed your password, it should lock you out if there are any old RDP sessions logging you on with old password. If you're unsure copy the old profile, create a new one and disable the one you suspect of being compromised.
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