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ACER laptop infected with backdoor gbot 69 (Cycbot.B)


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#1 godoftoast

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Posted 20 September 2011 - 02:28 AM

Hi there,

I am struggling to remove I virus I have recently gotten on my laptop.

Here are the symptoms of the virus:

>whenever I start the laptop, go to My Computer and pick a harddrive or whenever I run a document or plug in a USB device my computer makes a loud "static" sound (you know the type that radios make when searching for channels etc). Even if I mute my speakers, the sound still occurs (and the mute symbol goes off the sound volume setter).
>I cannot use Firefox because something to do with proxies (Im assuming the virus has somehow taken over my connections settins and is attempting to contact its host) hence I turned off my laptops internet.
>Delayed startup and laptop slow down

Here is what I have installed on my laptop:

>Malware Bytes free version (havent updated it in like 6-10 months) :(
>Spybot Search and Destroy free version (really lacking in the updates too) :(
>Microsoft Security Essentials - it is updated

Here is what I have done so far:

Ran MSE and got it to ID and clear the viruses --> requires reboot --> but upon reboot the virus is still there and MSE detects it again and the laptop makes the noisy static sounds.
Ran Malware Bytes and deleted the virus --> requires reboot --> virus detected again upon reboot and the laptop makes the noisy static sounds.
Ran Spybot Search and Destroy --> same situation with detection and reboots and virus revival.

I dont know how to get rid of it and I dont want to risk connecting my laptop to the internet.

What should I do? What scans should I first run and what logs should I post here?
Afterwards if you guys could assist me in the virus removal process I'd be most grateful

Thanks for your time and effort people. I too moderate on some forums and know how annoying newbie posters can get so I apologise if my thread is in the wrong place or the wrong format.

Cheers,

godoftoast

EDIT: I will post my malware bytes log and the output of a drwebcurit I ran from my USB. Not sure how helpful they will be but here they are

Edited by godoftoast, 20 September 2011 - 02:40 AM.


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#2 godoftoast

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Posted 20 September 2011 - 02:43 AM

First run:
Malwarebytes' Anti-Malware 1.46
www.malwarebytes.org

Database version: 4052

Windows 6.1.7601 Service Pack 1
Internet Explorer 8.0.7601.17514

20/09/2011 2:22:32 PM
mbam-log-2011-09-20 (14-22-32).txt

Scan type: Quick scan
Objects scanned: 128362
Time elapsed: 8 minute(s), 11 second(s)

Memory Processes Infected: 1
Memory Modules Infected: 0
Registry Keys Infected: 0
Registry Values Infected: 0
Registry Data Items Infected: 0
Folders Infected: 0
Files Infected: 1

Memory Processes Infected:
C:\Users\Ridhwan\AppData\Local\Temp\csrss.exe (Trojan.Agent) -> Unloaded process successfully.

Memory Modules Infected:
(No malicious items detected)

Registry Keys Infected:
(No malicious items detected)

Registry Values Infected:
(No malicious items detected)

Registry Data Items Infected:
(No malicious items detected)

Folders Infected:
(No malicious items detected)

Files Infected:
C:\Users\Ridhwan\AppData\Local\Temp\csrss.exe (Trojan.Agent) -> Quarantined and deleted successfully.

Second run:
Malwarebytes' Anti-Malware 1.46
www.malwarebytes.org

Database version: 4052

Windows 6.1.7601 Service Pack 1
Internet Explorer 8.0.7601.17514

20/09/2011 2:37:15 PM
mbam-log-2011-09-20 (14-37-15).txt

Scan type: Quick scan
Objects scanned: 128395
Time elapsed: 7 minute(s), 47 second(s)

Memory Processes Infected: 1
Memory Modules Infected: 0
Registry Keys Infected: 0
Registry Values Infected: 0
Registry Data Items Infected: 0
Folders Infected: 0
Files Infected: 1

Memory Processes Infected:
C:\Users\Ridhwan\AppData\Local\Temp\csrss.exe (Trojan.Agent) -> Unloaded process successfully.

Memory Modules Infected:
(No malicious items detected)

Registry Keys Infected:
(No malicious items detected)

Registry Values Infected:
(No malicious items detected)

Registry Data Items Infected:
(No malicious items detected)

Folders Infected:
(No malicious items detected)

Files Infected:
C:\Users\Ridhwan\AppData\Local\Temp\csrss.exe (Trojan.Agent) -> Quarantined and deleted successfully.

Third Run:
Malwarebytes' Anti-Malware 1.46
www.malwarebytes.org

Database version: 4052

Windows 6.1.7601 Service Pack 1
Internet Explorer 8.0.7601.17514

20/09/2011 3:28:52 PM
mbam-log-2011-09-20 (15-28-52).txt

Scan type: Flash scan
Objects scanned: 90973
Time elapsed: 51 second(s)

Memory Processes Infected: 1
Memory Modules Infected: 0
Registry Keys Infected: 0
Registry Values Infected: 0
Registry Data Items Infected: 0
Folders Infected: 0
Files Infected: 1

Memory Processes Infected:
C:\Users\Ridhwan\AppData\Local\Temp\csrss.exe (Trojan.Agent) -> Unloaded process successfully.

Memory Modules Infected:
(No malicious items detected)

Registry Keys Infected:
(No malicious items detected)

Registry Values Infected:
(No malicious items detected)

Registry Data Items Infected:
(No malicious items detected)

Folders Infected:
(No malicious items detected)

Files Infected:
C:\Users\Ridhwan\AppData\Local\Temp\csrss.exe (Trojan.Agent) -> Quarantined and deleted successfully.

DrWebCureIt run output from usb:
conhost.exe;c:\users\ridhwan\appdata\roaming\microsoft;BackDoor.Gbot.69;Deleted.;

However upon restart MSE Malwarebytes and Spydot all detected a virus located in the C:/Users/Ridhwan/Appdata file

#3 boopme

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Posted 20 September 2011 - 11:47 AM

Hello, first I must tell you this.
One or more of the identified infections is a backdoor trojan.

This allows hackers to remotely control your computer, steal critical system information and download and execute files.

I would counsel you to disconnect this PC from the Internet immediately. If you do any banking or other financial transactions on the PC or if it should contain 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. 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

We can still clean this machine but I can't guarantee that it will be 100% secure afterwards. Let me know what you decide to do.


The naxt cleaning step,if you choose this route.

Rerun MBAM (MalwareBytes) like this:

Open MBAM in normal/regular mode and click Update tab, select Check for Updates,when done
click Scanner tab,select Quick scan and scan (normal mode).
After scan click Remove Selected, Post new scan log and Reboot into normal mode.
How do I get help? Who is helping me?For the time will come when men will not put up with sound doctrine. Instead, to suit their own desires, they will gather around them a great number of teachers to say what their itching ears want to hear....Become a BleepingComputer fan: Facebook

#4 godoftoast

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Posted 21 September 2011 - 02:47 AM

Hi again.

Thanks for your advice. I decided to go the nuke it approach. I have rescued the files I need, shut off the internet and then using the f9 button, launched a full factory reset (as my recovery disks bit the dust and I didnt get a CD with the laptop). Currently I have restored to factory settings. I have connected it to my firewalled router and downloaded windows updates and some core drivers. I have disconected it from the internet and its been shut off.

What battery of programs should I use to check to make sure the backdoor trojan has been destroyed? I plan to download them on a clean computer and then use a USB to check for initial signs of virus. What free software should I install?

Any ideas on how to make sure this virus is gone?

Cheers,

#5 boopme

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Posted 21 September 2011 - 09:17 AM

Good. Update and rerun MBAM.

Before we start fixing anything you should print out these instructions or copy them to a NotePad file so they will be accessible. Some steps will require you to disconnect from the Internet or use Safe Mode and you will not have access to this page.

Please download Dr.Web CureIt and save it to your desktop. DO NOT perform a scan yet.
alternate download link
Note: The file will be randomly named (i.e. 5mkuvc4z.exe).

Reboot your computer in "Safe Mode" using the F8 method. To do this, restart your computer and after hearing your computer beep once during startup (but before the Windows icon appears) press the F8 key repeatedly. A menu will appear with several options. Use the arrow keys to navigate and select the option to run Windows in "Safe Mode".

Scan with Dr.Web CureIt as follows:
  • Double-click on the randomly named file to open the program and click Start. (There is no need to update if you just downloaded the most current version
  • Read the anti-virus check by DrWeb scanner prompt and click Ok where asked to Start scan now? Allow the setup.exe to load if asked by any of your security programs.
  • The Express scan will automatically begin.
    (This is a short scan of files currently running in memory, boot sectors, and targeted folders).
  • If prompted to dowload the Full version Free Trial, ignore and click the X to close the window.
  • If an infected object is found, you will be prompted to move anything that cannot be cured. Click Yes to All. (This will move any detected files to the C:\Documents and Settings\userprofile\DoctorWeb\Quarantine folder if they can't be cured)
  • After the Express Scan is finished, put a check next to Complete scan to scan all local disks and removable media.
  • In the top menu, click Settings > Change settings, and uncheck "Heuristic analysis" under the "Scanning" tab, then click Apply, Ok.
  • Back at the main window, click the green arrow "Start Scanning" button on the right under the Dr.Web logo.
  • Please be patient as this scan could take a long time to complete.
  • When the scan has finished, a message will be displayed at the bottom indicating if any viruses were found.
  • Click Select All, then choose Cure > Move incurable.
  • In the top menu, click file and choose save report list.
  • Save the DrWeb.csv report to your desktop.
  • Exit Dr.Web Cureit when done.
  • Important! Reboot your computer because it could be possible that files in use will be moved/deleted during reboot.
  • After reboot, post the contents of the log from Dr.Web in your next reply. (You can use Notepad to open the DrWeb.cvs report)

How do I get help? Who is helping me?For the time will come when men will not put up with sound doctrine. Instead, to suit their own desires, they will gather around them a great number of teachers to say what their itching ears want to hear....Become a BleepingComputer fan: Facebook




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