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how to tell if someone has hacked into your system

Posted on 2010-01-11
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Last Modified: 2013-12-06
i have a computer with several pings to daily from all over the world.
how can i tell if they have got into the system?

thanks
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Question by:webdott
7 Comments
 

Author Comment

by:webdott
ID: 26285244
this is one of the pings:
Event Type: Information
Event Source: WinVNC4
Event Category: None
Event ID: 1
Date:  1/4/2010
Time:  5:10:52 PM
User:  N/A
Computer: MAIN
Description:
The description for Event ID ( 1 ) in Source ( WinVNC4 ) cannot be found. The local computer may not have the necessary registry information or message DLL files to display messages from a remote computer. You may be able to use the /AUXSOURCE= flag to retrieve this description; see Help and Support for details. The following information is part of the event: Connections, accepted: 200.175.180.64::xxxx.
it says the connection was accepted?
does this mean they got it?

 
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LVL 17

Expert Comment

by:chuku
ID: 26290571
This error mean nothing
there are many scans out there but it doesn't mean they got in
do you have a firewall or any other security deices and logs?
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LVL 21

Accepted Solution

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snusgubben earned 1000 total points
ID: 26290914
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LVL 6

Assisted Solution

by:hmtwins
hmtwins earned 1000 total points
ID: 26297003
Check  Snusgubben suggestion.

A couple of things to find out is you are hacked.

1. check you outgoing connections (netstat -ab) this will show you your connections and what application is running on that connection. If you see any application you don't know investigate it.

2. You can run process explorer to see if any strange application is starting up that you don't know.

3. Update you computer and you application. every application can be used to infect you computer with a keylogger, backdoor etc.

4. Make sure you have a up to dat virus scanner installed

5. If you dont trust is a all. Do the safes thing, make a backup of you files and reinstall you computer (last option)
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LVL 21

Expert Comment

by:snusgubben
ID: 26297847
Just another thought.

Is you computer behind a firewall in a LAN?

Are we talking about a Windows domain?

Leaving VNC open towards the Internet is risky business. There is a VNC v.4.1.1 cracker tool that allowed users to bypass the VNC authentication. So be sure to check your VNC version.
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Author Comment

by:webdott
ID: 26310465
yes it is VNC v4.1.1 free edition.
It is behind a sonicwall firewall. no anti-virus or other on this server
operating system: windows server 2003 r2
i have uninstalled the VNC. the errors have haved stopped in eventvwr
 
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Author Closing Comment

by:webdott
ID: 31675591
thanks
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