Backdoor.bot Infection

[Perno]

Hi,

I have a computer at work that was had a memory process (system\svchost.exe) infected with this backdoor.bot according to the MWBAM log. Removed it with RWBAM but it keeps coming back a day or so later.

I've run a full scan of the system with my antivirus (Avira) and ran MWBAM and now everything is coming back as clean...but I've done this the past few days and the backdoor.bot comes back each time. I know I need to post log files and install Defogger, DDS, and the GMER Rootkit scanner, but should I do it now or wait until it gets infected again? Don't want to waste anyone's time. Thank you for any help!

[screen317]

Hi and welcome to Malwarebytes.

I'm afraid I have bad news.

A backdoor severely compromises system integrity.

A compromised system may allow illicit network connections, disabling of security software, modifying critical system files and collection and transmiission of personal identifiable information without your consent.

I recommend that you disconnect this PC from the Internet immediately, and only reconnect to download any tools that are required. If you do any banking or other financial transactions on the PC or it if it contains any other sensitive information, please get to a known clean computer and change all passwords where applicable, and it would be wise to contact those same financial institutions to apprise them of your situation.

Though the Trojan has been identified and can be killed, because of it's backdoor functionality, your PC is very likely compromised and there is no way to be sure your computer can ever again be trusted. Many experts in the security community believe that once infected with this type of Trojan, the best course of action would be a reformat and reinstall of the OS. If it were on my PC I would not hesitate for a moment to do so. Please read these for more information:

How Do I Handle Possible Identify Theft, Internet Fraud and CC Fraud?

When Should I Format, How Should I Reinstall

Should you decide not to follow that advice, we will of course do our best to clean the computer of any infections that we can see but, as I already stated, we can in no way guarantee it to be trustworthy.

Should you have any questions, please feel free to ask.

Let me know what you decide.

[Perno]

Actually, I asked around the IT people I know and one told me to get the TSSKiller from Kaspersky, and that took care of getting rid of the rootkit that was installed. Is that a common fix?

[screen317]

Hi,

Like I said, the trojan can be removed, but the payload that it carried may not be gone. If your computer had become part of a botnet, you never would have known, and your computer would be continuously sending out spam without your knowledge.

However it is your decision how to proceed and I offered my recommendations.

As I said, "Should you decide not to follow that advice, we will of course do our best to clean the computer of any infections that we can see but, as I already stated, we can in no way guarantee it to be trustworthy.

Should you have any questions, please feel free to ask"

Up to you.

[screen317]

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