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How do I clean up after someone's broken into my computer?

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Summary: The news is grim if someone's broken into your computer, but there are steps to take to prevent it from happening again.

My computers' security has been compromised. How can I rid my computer of a remote intruder. I've had this computer for about 5 or 6 years. ... I found out about the nefarious activities only after the person left my company. Although I can't think of anything of value, this person is extremely clever and smart. If getting rid of my computer and replacing it with a new one is the only way to unequivocally extract this 'spectator' I'll do it in a heartbeat. However - what safeguards must be in place from day 1 with a new computer to prevent the same thing from happening again, plus prevent any and all intrusions imparting absolute confidence in the security of my personal computer?

A tricky problem, to be sure. Someone breaks in, you know they're smart, but you don't what they did. Can you clean up and how do you keep it from happening again?

The news really isn't good.

There's a school of thought that says if your computer has been compromised, you have really only one option: reformat. That's a drastic step, but if your intruder is as adept as you indicate, it may be the best approach. If they're really good, they could leave hooks that you could never find.

In your shoes, I'd do the following:

  • disconnect from the net

  • reformat/rebuild the machine

  • rename the administrator account and give it a strong password

  • get thee behind a firewall, and avoid opening any incoming ports you don't absolutely have to.

  • make sure to get ALL the latest security patches.

  • USE the administrator account as little as possible. Create user level accounts for actual day-to-day usage. Again, strong passwords all around.

  • Turn off all unnecessary services; Remote Desktop being the most obvious.

  • Consider an outgoing firewall (something like ZoneAlarm) to trap and/or monitor outgoing traffic.

  • Lastly: remember physical security. Another old adage is that if it's not physically secure, it's not secure. If someone can walk up to it, insert a floppy and reboot, then all the other security is for naught.

Readers: do you have additional tips for security? Add your comments below.

Related:

Article C2199 - October 7, 2004

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Recent Comments
18 Comments

best advice is to download: zone alarm, adaware, and spybot search and destroy, and nortan anti virus. Disconnect from the internet take of any programs or folders that u dont need anymore of look a lil sus. Install all those programs and set them up, change your ip address. Download all the latest updates then back ofline and scan your computer clean. Also try and back up those valuable files.If u do want a new computer get 1 then load all that stuff onto it so that they cant access it again. If they continually do it and you cant fix it theres allways the good old baseball bat visit them aproach :P

Posted by: phil at November 10, 2005 9:19 PM

Is it easy for someone to brake in my email account and change the password? I'm trying to get in my yahoo account when I know that I have the password and id. It does not work....I think someone has changed my password but, how. Would they have to be a computer genious to change it?

Posted by: sara at February 13, 2006 2:42 PM

Hi.
Could a computer still have spyware after I scanned it? Could it destroy a computer?

Y.Chen

Posted by: Y.Chen at August 24, 2006 12:18 PM

Hi
I have a friend who I trusted to help me with my computer, he usually comes and helps when ever I have a problem, recently I find out that he know how to get into someone elses computer and see their bussines camara, now he can see whats going on from his home, I my self have a web cam and I wonder if he could have acces to my computer and know everything I do or write in my comp from his home. He was here last week and did something in the computer.
I dont want to acuse him of something if Im not sure.
I really apreciate if someone can help me

Posted by: Christy at September 5, 2006 7:05 PM

Someone I know has broken into my email and sent trashy emails using my name. Also they are sending emails trying to distroy my business saying items have been recalled. How do I catch them after the fact. Is there a way to get the IP number from the computer they used so I can prove they were the sabatogers.

Posted by: janet at October 10, 2006 8:07 PM

A person I trusted a lot has a lot of computer knowledge. He works in a data center. He has opened an email address at my work to make it look like it was done on my computer, under my other user IDs, which were mine. HE wrote himself emails and turned me in to HR for a "hostile work environment". I am really worried because he had both of my laptops for a few days each and now he is mad at me and seeking revenge. Is it possible for him to have gained remote access into my laptops to send futher emails that appear to be me? I also found my firewalls were off and I have an unsecure wireless network I used for a while. I am really scared. I am now being investigated at work and I know his knowledge and anger will get me fired. How do I prove my innocence with someone who had total electronic access and ability to set me up?

Posted by: AMW at February 11, 2008 6:52 AM

Hi, I have a small company. I fired someone the other day, and they used our compnay password to take down a few job ads that we had up on our job board. Do you know the law pertaining to this kind of behavior? I know it's criminal behvior, but is it worth trying to put the person in jail?

Posted by: Rosemary at May 22, 2008 5:21 PM

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"Is is worth it?" - that's not a question I can answer.
That's something you want to ask an attorney.

Leo


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Posted by: Leo at May 25, 2008 9:36 AM

I have also had my aol,gmail email accounts hacked by someone that was very close to me. If she had access to my laptop in my home could she have gotten the passwords that way. I did have a couple of my accounts the the passwords remembered on my old laptop. She has been sending nasty emails from one of my email accounts also how do i find out where these emails were sent from? It was an aol account that she had access to of mine. I have the emails in the sent box im trying to find out where they were sent from the ip information?
Any help would be appreciated.

Posted by: Louise at February 12, 2009 8:41 PM

I too had my computer access compromised as a remote user on the company's PC in my home. Someone hijacked my e-mail address, both personal and my work Lotus Notes accounts, andn were sending damaging e-mails to others with my address. I have always used either Verizon or Comcast high-speed, but I was pushed to try "remote access," which I believe was constantly trying to be setup on the PC, which would not work. I could not stay connected at all, until I put a router between my cable modem and the PC, but then I was "slammed" every 15 minutes until I took the router off. Because of all this, my work reputation has been ruined, my skill reputation has been ruined, and I am finding it extremely difficult to rebuild my reputation. I have been "black-balled" out of the business that I was in, and now can only find part-time work doing menial tasks in the same field; however, my bosses have perceived me to be unintelligent. I will graduate with a bachelor's degree in a technology field, and actually have an associate degree in a technology field. HELP! HOW DO I REINVENT MYSELF AND REGAIN MY WORK REPUTATION SO THAT I CAN FIND A DECENT JOB? Will I need to completely start over? I have been sent into almost finanacial ruin because of these lies and underhanded tactics at my former employer. The techs at work were constantly "reformatting" the PC, which was work's, but I couldn't even do my job -- it was like there were constantly two people (at least) connected on with me at all times. My cable company administrator told me that he was watching my connection and help me one time when the PC "crashed." We found some kind of ancient NT error -- it took down everything. After I didn't have to connect to that employer anymore, IMMEDIATELY my problems disappeared.

Posted by: Maria at March 27, 2009 5:25 PM

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