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trojan.agent.bypass.gen


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#1 mal80

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Posted 21 January 2010 - 02:28 PM

Hello

This evening Spyware Doctor alerted me to this threat: trojan.agent.bypass.gen

The programme quarantined the trojan, but upon restarting the computer it appeared again. I have repeated this action and again the trojan had returned.

It has an associated registry key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run#RTHDBPL

I am using Firefox, which has been acting slightly odd since the threat first appeared. Every so often a new tab will open with an unknown website. Also, some websites seem to be struggling to open, or they will forward me to a blank google page or something like that.

Having googled the name I'm aware others have had problems with similarly named Trojans. I feel a bit out of my depth with this one so I'm really hoping someone can help me get rid of it, and tell me if it could do any serious damage.

Thanks
Mal

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#2 boopme

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Posted 21 January 2010 - 04:26 PM

Hello and welcome. Let's see how we are after running these.

Next run MBAM (MalwareBytes):

NOTE: Before saving MBAM please rename it to zztoy.exe....now save it to your desktop.

Please download Malwarebytes Anti-Malware and save it to your desktop.

alternate download link

MBAM may "make changes to your registry" as part of its disinfection routine. If using other security programs that detect registry changes (ie Spybot's Teatimer), they may interfere or alert you. Temporarily disable such programs or permit them to allow the changes.
  • Make sure you are connected to the Internet.
  • Double-click on mbam-setup.exe to install the application.
  • When the installation begins, follow the prompts and do not make any changes to default settings.
  • When installation has finished, make sure you leave both of these checked:
    • Update Malwarebytes' Anti-Malware
    • Launch Malwarebytes' Anti-Malware
  • Then click Finish.
MBAM will automatically start and you will be asked to update the program before performing a scan.
  • If an update is found, the program will automatically update itself. Press the OK button to close that box and continue.
  • If you encounter any problems while downloading the definition updates, manually download them from here and just double-click on mbam-rules.exe to install.
On the Scanner tab:
  • Make sure the "Perform Quick Scan" option is selected.
  • Then click on the Scan button.
  • If asked to select the drives to scan, leave all the drives selected and click on the Start Scan button.
  • The scan will begin and "Scan in progress" will show at the top. It may take some time to complete so please be patient.
  • When the scan is finished, a message box will say "The scan completed successfully. Click 'Show Results' to display all objects found".
  • Click OK to close the message box and continue with the removal process.
Back at the main Scanner screen:
  • Click on the Show Results button to see a list of any malware that was found.
  • Make sure that everything is checked, and click Remove Selected.
  • When removal is completed, a log report will open in Notepad.
  • The log is automatically saved and can be viewed by clicking the Logs tab in MBAM.
  • Copy and paste the contents of that report in your next reply. Be sure to post the complete log to include the top portion which shows MBAM's database version and your operating system.
  • Exit MBAM when done.
Note: If MBAM encounters a file that is difficult to remove, you will be asked to reboot your computer so MBAM can proceed with the disinfection process. If asked to restart the computer, please do so immediately. Failure to reboot normally (not into safe mode) will prevent MBAM from removing all the malware.


Next run ATF and SAS: If you cannot access Safe Mode,run in normal ,but let me know.

Note: On Vista, "Windows Temp" is disabled. To empty "Windows Temp" ATF-Cleaner must be "Run as an Administrator".

From your regular user account..
Download Attribune's ATF Cleaner and then SUPERAntiSpyware , Free Home Version. Save both to desktop ..
DO NOT run yet.
Open SUPER from icon and install and Update it
Under Scanner Options make sure the following are checked (leave all others unchecked):
Close browsers before scanning.
Scan for tracking cookies.
Terminate memory threats before quarantining
.
Click the "Close" button to leave the control center screen and exit the program. DO NOT run yet.

Now reboot into Safe Mode: How to enter safe mode(XP)
Using the F8 Method
Restart your computer.
When the machine first starts again it will generally list some equipment that is installed in your machine, amount of memory, hard drives installed etc. At this point you should gently tap the F8 key repeatedly until you are presented with a Windows XP Advanced Options menu.
Select the option for Safe Mode using the arrow keys.
Then press enter on your keyboard to boot into Safe Mode
.

Double-click ATF-Cleaner.exe to run the program.
Under Main "Select Files to Delete" choose: Select All.
Click the Empty Selected button.

If you use Firefox or Opera browser click that browser at the top and choose: Select All
Click the Empty Selected button.
If you would like to keep your saved passwords, please click No at the prompt.
Click Exit on the Main menu to close the program
.

NOW Scan with SUPER
Open from the desktop icon or the program Files list
On the left, make sure you check C:\Fixed Drive.
Perform a Complete scan. After scan,Verify they are all checked.
Click OK on the summary screen to quarantine all found items.
If asked if you want to reboot, click "Yes" and reboot normally.

To retrieve the removal information after reboot, launch SUPERAntispyware again.
Click Preferences, then click the Statistics/Logs tab.
Under Scanner Logs, double-click SUPERAntiSpyware Scan Log.
If there are several logs, click the current dated log and press View log.
A text file will open in your default text editor.
Please copy and paste the Scan Log results in your next reply.
Click Close to exit the program.


Please ask any needed questions,post logs and Let us know how the PC is running now.
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

#3 mal80

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Posted 22 January 2010 - 07:22 AM

Thank you very much for your assistance.

I have attempted to do as you suggested.

The anti-malware programme I ran first actually found quite a few things, which it then deleted. But when I attempted to follow your next instruction I found I could not open the computer in Safe Mode. As you suggested, I ran ATF then SUPER in normal mode anyway. Unfortunately SUPER crashed before it could complete the scan. It had found one trojan and appeared to be near the end of its scan when it stopped responding and stopped scanning. I was forced to close the programme via Task Manager, so losing the trojan it had discovered. I have just started a new scan so will let you know the results of that, if it works.

On the plus side, on last reboot, Spyware Doctor did not find the trojan I originally mentioned. However, a rogue tab is still opening when I first load Firefox, and there is clearly still (at least) one trojan lurking in there somewhere. So your continued assistance would be very much appreciated.

I will let you know how this progresses.

#4 boopme

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Posted 22 January 2010 - 10:50 AM

Sounds like progress...
SUPERAntiSypware has a built in "Repairs" feature to fix policy restrictions and certain Windows settings which are sometimes targeted by malware infection. To use this feature, launch SUPERAntiSypware.
  • Click the Repairs tab.
  • Click on (highlight) "Repair broken SafeBoot key" and then click the Repair button.
  • You may be asked to reboot your computer for the changes to take effect.
Try running again in Safe mode.

If that one still exists run DrWeb

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 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

#5 mal80

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Posted 22 January 2010 - 11:44 AM

Tried doing that but still could not run in Safe Mode. Should I run a scan with Dr Web anyway, or there something else to try?

#6 boopme

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Posted 22 January 2010 - 11:49 AM

Well ... Yes let's see if it removes something stopping Safe Mode. as this is a real problem.
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

#7 mal80

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Posted 22 January 2010 - 12:24 PM

Sorry about this but the situations is somewhat worse now. I noticed that SUPER included a programme called, I think, SafeBoot, so I tried using that to see if it would work. In hindsight I see the problem - it is trying to start the computer in safe mode each time, but the computer won't do it. The result is that Windows now won't start in any mode. I am now using another computer and really hoping there's a way round this. Sorry for the added complication.

#8 boopme

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Posted 22 January 2010 - 05:10 PM

It's why I said this is a prblem. Most times when safe mode fails a reformat and install will be the solution.
Let's try a recue disk.

Avira AntiVir Rescue System
To use a rescue disk, The boot order must be set to start from the CD-ROM drive. If the CD is not first in the boot sequence, the computer will attempt to start normally by booting from the hard drive. The boot order is a setting found in the computerís BIOS which runs when it is first powered on. This setting controls the order that the BIOS uses to look for a boot device from which to load the operating system. Different computers have different ways to enter the BIOS. If you're not sure how to do this, refer to Changing Your Computers Boot Order.
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

#9 mal80

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Posted 22 January 2010 - 06:20 PM

Well it's taken me hours to figure out how but I've finally got back in. I went into Recovery Console and created a new boot.ini so I'm booting via that. It works fine, although Safe Mode still doesn't work. I'm now scanning with Dr Web. It's already found something so we'll see if that makes a difference.

Thanks again for your help.

#10 mal80

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Posted 23 January 2010 - 07:03 AM

I ran a complete DrWeb scan last night and what I got was this:

iaStor.sys;C:\WINDOWS\system32\drivers;BackDoor.Tdss.1866;Cured.;

Only that one (various other things were turned up by Malwarebytes previously, and deleted).

That, along with the fact that Firefox is no longer directing me to random sites and Spyware Doctor isn't picking anything else up, seems to me a positive sign. But I haven't tried Safe Mode yet this morning to see if that's working again.

What should my next check be?

Edited by mal80, 23 January 2010 - 07:05 AM.


#11 mal80

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Posted 23 January 2010 - 09:08 AM

Ok, the computer now runs fine in Safe Mode. So I ran SUPER in Safe Mode, uncovering another couple of rogue files. Here is the log. What do you think?


SUPERAntiSpyware Scan Log
http://www.superantispyware.com

Generated 01/23/2010 at 01:41 PM

Application Version : 4.33.1000

Core Rules Database Version : 4446
Trace Rules Database Version: 0

Scan type : Complete Scan
Total Scan Time : 01:13:58

Memory items scanned : 222
Memory threats detected : 0
Registry items scanned : 5860
Registry threats detected : 0
File items scanned : 26362
File threats detected : 6

Trojan.Agent/Gen-Nullo[Short]
C:\AVENGER\SDRA64.EXE
C:\SYSTEM VOLUME INFORMATION\_RESTORE{DEA03780-4082-4DBA-9DE3-03F7BF11AF93}\RP316\A0076702.EXE

Adware.Tracking Cookie
C:\WINDOWS\system32\config\systemprofile\Cookies\system@doubleclick[2].txt
C:\WINDOWS\system32\config\systemprofile\Cookies\system@atdmt[2].txt
C:\WINDOWS\system32\config\systemprofile\Cookies\system@viacom.adbureau[2].txt
C:\WINDOWS\system32\config\systemprofile\Cookies\system@www.findit-quick[1].txt

#12 boopme

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Posted 24 January 2010 - 05:24 PM

As that root kit is extremely dangerous Now that your PC is stabilized I want you to post an HJT log and see if threr is anything left. We needed to get it stable as it will be several days before they reply. They are very backlogged,but they will answer it.

You will need to run HJT/DDS.
Please follow this guide. go and do steps 6 thru 8 ,, Preparation Guide For Use Before Using Hijackthis. Then go here HijackThis Logs and Virus/Trojan/Spyware/Malware Removal ,click New Topic,give it a relevant Title and post that complete log.

Let me know if it went OK.
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

#13 Orange Blossom

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Posted 28 January 2010 - 09:03 PM

Hello,

Now that you have posted a log here: http://www.bleepingcomputer.com/forums/t/291258/trojan-gen-nulloshort-agentbypassgen-etc/ you should NOT make further changes to your computer (install/uninstall programs, use special fix tools, delete files, edit the registry, etc) unless advised by a HJT Team member, nor should you ask for help elsewhere. Doing so can result in system changes which may not show in the log you already posted. Further, any modifications you make on your own may cause confusion for the helper assisting you and could complicate the malware removal process which would extend the time it takes to clean your computer.

From this point on the HJT Team should be the only members that you take advice from, until they have verified your log as clean.

Please be patient. It may take a while to get a response because the HJT Team members are EXTREMELY busy working logs posted before yours. They are volunteers who will help you out as soon as possible. Once you have made your post and are waiting, please DO NOT make another reply until it has been responded to by a member of the HJT Team. Generally the staff checks the forum for postings that have 0 replies as this makes it easier for them to identify those who have not been helped. If you post another response there will be 1 reply. A team member, looking for a new log to work may assume another HJT Team member is already assisting you and not open the thread to respond.

Please be patient. It may take several days, up to two weeks perhaps less, to get a response but your log will be reviewed and answered as soon as possible. I advise checking your topic once a day for responses as the e-mail notification system is unreliable.

To avoid confusion, I am closing this topic. Good luck with your log.

Orange Blossom :thumbsup:
Help us help you. If HelpBot replies, you MUST follow step 1 in its reply so we know you need help.

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