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Consumer Products => Avast Free Antivirus / Premium Security (legacy Pro Antivirus, Internet Security, Premier) => Topic started by: lazarus78231 on April 19, 2012, 04:16:50 PM

Title: win32:downloader-NZI
Post by: lazarus78231 on April 19, 2012, 04:16:50 PM
I picked up a trojan that only shows up in a boot time scan, doesnt show up in a normal full system scan , and avast cant delete, repair or move to chest, i get an error saying that the "Operation is not supported for this type of archive"  the TRJ is named win32:downloader-nzi   
Title: Re: win32:downloader-NZI
Post by: essexboy on April 19, 2012, 04:36:21 PM
Hi lets have a shufti

 Download OTL (http://oldtimer.geekstogo.com/OTL.exe)  to your Desktop
netsvcs
%SYSTEMDRIVE%\*.exe
/md5start
consrv.dll
explorer.exe
winlogon.exe
Userinit.exe
svchost.exe
/md5stop
C:\Windows\assembly\tmp\U\*.* /s
%Temp%\smtmp\1\*.*
%Temp%\smtmp\2\*.*
%Temp%\smtmp\3\*.*
%Temp%\smtmp\4\*.*
>C:\commands.txt echo list vol /raw /hide /c
/wait
>C:\DiskReport.txt diskpart /s C:\commands.txt /raw /hide /c
/wait
type c:\diskreport.txt /c
/wait
erase c:\commands.txt /hide /c
/wait
erase c:\diskreport.txt /hide /c
CREATERESTOREPOINT
THEN

Download aswMBR.exe (http://public.avast.com/~gmerek/aswMBR.exe) ( 1.8mb ) to your desktop.
 Double click the aswMBR.exe to run it  Click the "Scan" button to start scan 

(http://i1224.photobucket.com/albums/ee362/Essexboy3/aswMBR%20shots/aswMBRScan.gif)

On completion of the scan click save log, save it to your desktop and post in your next reply

(http://i1224.photobucket.com/albums/ee362/Essexboy3/aswMBR%20shots/aswMBRsavelog.gif)
Title: Re: win32:downloader-NZI
Post by: demontosome26 on April 24, 2012, 06:38:19 AM
I recently got infected with this same trojan, so here are the logs in order:

Title: Re: win32:downloader-NZI
Post by: essexboy on April 24, 2012, 08:36:21 PM
You have run Combofix at some stage and the AV is alerting on a service that failed to complete the cleaning

Warning This fix is only relevant for this system and no other, using on another computer may cause problems

Be advised that when the fix commences it will shut down all running processes and you may lose the desktop and icons, they will return on reboot

If you have Malwarebytes 1.6 or better installed please disable it for the duration of this run
To disable MBAM
Open the scanner and select the protection tab
Remove the tick from "Start with Windows"
Reboot and then run OTL
(http://i1224.photobucket.com/albums/ee362/Essexboy3/mbamstop.jpg)

Run OTL
Title: Re: win32:downloader-NZI
Post by: demontosome26 on April 25, 2012, 05:11:25 AM
Here we go:
Title: Re: win32:downloader-NZI
Post by: essexboy on April 25, 2012, 08:25:25 PM
How is the computer behaving now ?  I see that you have both CA and Avast.  I would recommend uninstalling one of them 
Title: Re: win32:downloader-NZI
Post by: demontosome26 on April 26, 2012, 02:06:03 AM
Thus far I haven't seen any problems other than the Windows Installer popping up during the start up process.  I've also noticed that I'm not able to go into Stand By or Hibernate after running that last fix.  I'm also only using Avast, so I'm guessing that some components of CA may still be on this laptop, which is something I don't want. 
Title: Re: win32:downloader-NZI
Post by: essexboy on April 26, 2012, 07:37:39 PM
Run the CA uninstall tool from here http://cainternetsecurity.net/KB/KD.aspx?KDId=644

When windows installer pops up what programme does it reference ?
Title: Re: win32:downloader-NZI
Post by: demontosome26 on April 26, 2012, 11:45:37 PM
I launched that link, but when I click on the CA Uninstaller it takes me to Remote Assistance and I don't know if I should go that route.  Would you recommend it?

The pop up I get happens during the start up of Windows and it's basically just a small window that reads "Windows Installer.......Preparing To Install.."
Title: Re: win32:downloader-NZI
Post by: essexboy on April 27, 2012, 07:24:09 PM
Download the windows uninstaller utility to clear the initial popup http://majorgeeks.com/download.php?det=4459

For CA if you could run a fresh OTL log I will remove it manually for you

Title: Re: win32:downloader-NZI
Post by: demontosome26 on April 27, 2012, 08:47:29 PM
I downloaded the Windows Uninstaller Utility and afterwards it seemed to have brought back the issues with the trojan virus.  I did have some errors while running the Uninstaller and they are as follows:

Error 1500, Another installation is in progress. You must complete that installations before continuing this one.

(I ended processes dealing with CA through the Task Manager "Processes Tab" [Anything with the letters Umx and also Msiexec)

User 'SYSTEM' has previously initiated an install for product 'CA Personal Firewall.' That user will need to run that install again before they can use that product. Your current install will now continue.

Error 1704, An installation for CA Personal Firewall is currently suspended. You must undo the changes made by that installation to continue. Do you want to undo those changes?

(I responded with Yes)

After doing this the virus pop-ups once again started up and my firewall again became de-activated.  I decided to run MicrosoftFixIt again to correct the issue with the firewall, but I later also ran system restore to yesterday's date and it seems everything is back to normal.  I ran a Quick Scan through OTL and the info is down below.  I really appreciate all the help.
Title: Re: win32:downloader-NZI
Post by: essexboy on April 27, 2012, 09:27:58 PM
Run MSICU again and delete anything associated with CA.  As you can see it is still running a lot of files.  You may need the MSFixit again for the firewall   

Warning This fix is only relevant for this system and no other, using on another computer may cause problems

Be advised that when the fix commences it will shut down all running processes and you may lose the desktop and icons, they will return on reboot

If you have Malwarebytes 1.6 or better installed please disable it for the duration of this run
To disable MBAM
Open the scanner and select the protection tab
Remove the tick from "Start with Windows"
Reboot and then run OTL
(http://i1224.photobucket.com/albums/ee362/Essexboy3/mbamstop.jpg)

Run OTL
Title: Re: win32:downloader-NZI
Post by: demontosome26 on April 27, 2012, 09:43:57 PM
How would I go about deleting everything associated with CA using MSICU?  I ask because of the errors it gave me last time I ran it and also because it doesn't give me a list of what I can delete.  The firewall issue has been corrected, so that's fine now.  Can I run the OTL custom fix that you posted above first?
Title: Re: win32:downloader-NZI
Post by: essexboy on April 27, 2012, 09:56:37 PM
Yes - create a restore point first and then run the OTL fix

Could you run this MSFixit as it is the latest version of the cleanup utility  ( I have never had need to try this version)
http://support.microsoft.com/kb/2438651/
Title: Re: win32:downloader-NZI
Post by: demontosome26 on April 27, 2012, 10:40:28 PM
I already ran the fix and I have attached the log as you asked.  Let me know if you'd still like me to run MSFixIt.
Title: Re: win32:downloader-NZI
Post by: essexboy on April 27, 2012, 11:04:25 PM
CA seems to be history, only run the fixit if you still get windows installer popping up

How is the computer behaving now ? 
Title: Re: win32:downloader-NZI
Post by: demontosome26 on April 27, 2012, 11:27:27 PM
Everything seems to be running perfectly now and that also includes no Windows Installer pop-up.  THANK YOU VERY MUCH! 

I usually run a Boot Time Scan on a daily basis, so can I start doing that again?  I also wanted to mention that I will continue recommending Avast! to everyone I know.  Thanks again!
Title: Re: win32:downloader-NZI
Post by: essexboy on April 27, 2012, 11:31:19 PM
To be honest I can see no real need for a bootscan on a daily basis, I do one once or twice a year just for the fun of it 

Subject to no further problems   :)

I will remove my tools now and give some recommendations, but, I would like you to run for 24 hours or so and come back if you have any problems 

Now the best part of the day ----- Your log now appears clean  :thumbsup:

A good workman always cleans up after himself so..The following will implement some cleanup procedures as well as reset  System Restore points:

Run OTLRun OTL and hit the cleanup button.  It will remove all the programmes we have used plus itself. 

We will now confirm that your hidden files are set to that, as some of the tools I use will change thatNow that you are clean, to help protect your computer in the future I recommend that you get the following free programmes:

(http://img233.imageshack.us/img233/7729/mbamicontw5.gif) Malwarebytes (http://www.malwarebytes.org/mbam-download.php).

Update and run weekly to keep your system clean

Download and install FileHippo update checker (http://www.filehippo.com/updatechecker/) and run it monthly it will show you which programmes on your system need updating and give a download link

It is critical to have both a firewall and anti virus to protect your system and to keep them updated. To keep your operating system up to date visit To learn more about how to protect yourself while on the internet read our little guide  How did I get infected in the first place ? (http://www.geekstogo.com/forum/topic/225044-preventing-malware-and-safe-computing/)Keep safe  :wave:
Title: Re: win32:downloader-NZI
Post by: bob3160 on April 27, 2012, 11:31:36 PM
Quote
I usually run a Boot Time Scan on a daily basis

May I ask why since that makes no sense. ???
Title: Re: win32:downloader-NZI
Post by: demontosome26 on April 27, 2012, 11:54:10 PM
I ran that last fix and I also checked the "Hidden Files and Folders Section" and they're already set to be hidden.  The reason I do a Boot-Time Scan over a regular scan is because I've had the understanding that it's more of a deep rooted scan, so I would assume that's better to use.  I also don't mind waiting a bit longer for it to run it's process.  Would you not recommend doing this?

I will also come back within 24 hours if I notice any kinds of issues.  Again I want to say thank you!  All of you take time out of your day to help people out on here, so it should be recognized. 
Title: Re: win32:downloader-NZI
Post by: iroc9555 on April 28, 2012, 12:31:39 AM
Quote from: demontosome26 on April 27, 2012, 11:54:10 PM
...The reason I do a Boot-Time Scan over a regular scan is because I've had the understanding that it's more of a deep rooted scan, so I would assume that's better to use.  I also don't mind waiting a bit longer for it to run it's process.  Would you not recommend doing this?

Boot-Time scan is a specialized tool to remove infections before they have time to run making it easier to remove them. Also it should be ran when Avast! itself ask you to do so ( When Avast! detects suspicious programs that can not be completely remove after a regular scan ) or when it is suspected that your comp has a virus that the regular scans can not detect.

Remember that Avast! is continuously scanning any file you, the system, or by itself run in your comp making a daily scan unnecessary. Myself I run a quick scan weekly and a full scan every month or so.
Title: Re: win32:downloader-NZI
Post by: bob3160 on April 28, 2012, 01:00:11 AM
Once the boot time scan has finished running, you've scanned as many files as are possible.

As already stated, any files added, changed or accessed, are automatically scanned by avast!.
Why would you repeat scanning something that has already been confirmed as clean ???
Once the boot time scan has confirmed your system as clean, additional scans are really not needed. IMHO.
Title: Re: win32:downloader-NZI
Post by: demontosome26 on May 04, 2012, 12:47:44 AM
I finally got around to doing a new scan and it still picked up an infection in the form of umxattachment.exe (win32 downloader nzi trojan).  However the laptop seems to be running quite smoothly, so what would you recommend from here, Essex? 
Title: Re: win32:downloader-NZI
Post by: demontosome26 on May 06, 2012, 02:04:19 AM
Any update yet?
Title: Re: win32:downloader-NZI
Post by: bob3160 on May 06, 2012, 02:17:19 AM
Quote from: demontosome26 on May 06, 2012, 02:04:19 AM
Any update yet?
He's probably sleeping.  ;D
Title: Re: win32:downloader-NZI
Post by: essexboy on May 06, 2012, 02:01:17 PM
Sorry missed the reply

What is the location of umxattachment.exe and is Avast not deleting it ?
Title: Re: win32:downloader-NZI
Post by: demontosome26 on May 07, 2012, 09:43:37 AM
We all get busy, so no worries.  I wasn't able to copy and paste the exact location of the virus, so I just did a print screen of the location instead.  You can find it in the attachment.
Title: Re: win32:downloader-NZI
Post by: essexboy on May 07, 2012, 05:10:27 PM
OK that is within the Computerr Associates firewall installation package

Now I can delete the entire MSI package but it means that you will not be able to uninstall CA firewall

Do you wish me to do that ?
Title: Re: win32:downloader-NZI
Post by: bob3160 on May 07, 2012, 05:19:05 PM
Quote from: essexboy on May 07, 2012, 05:10:27 PM
OK that is within the Computerr Associates firewall installation package

Now I can delete the entire MSI package but it means that you will not be able to uninstall CA firewall

Do you wish me to do that ?
@essexboy,
Can he uninstall CA first, then have you do the fix and he can then do a fresh install if CA ???
That way CA can still be uninstalled at a later time ???
Title: Re: win32:downloader-NZI
Post by: essexboy on May 07, 2012, 05:25:21 PM
I believe this is the last bit of CA left on the system - we had tried to remove it earlier
Title: Re: win32:downloader-NZI
Post by: bob3160 on May 07, 2012, 05:28:43 PM
Quote from: essexboy on May 07, 2012, 05:25:21 PM
I believe this is the last bit of CA left on the system - we had tried to remove it earlier
Ok since it was to be removed than that should take care of it. :)
Title: Re: win32:downloader-NZI
Post by: demontosome26 on May 07, 2012, 06:57:33 PM
I'll do whatever you feel is best to do from this point.  I also wanted to mention that the last time I tried to use that uninstall link you sent me from CA it sent me straight into remote assistance and I didn't know if I should trust them.
Title: Re: win32:downloader-NZI
Post by: essexboy on May 07, 2012, 07:47:39 PM
OK I will use OTL to delete the installer

Warning This fix is only relevant for this system and no other, using on another computer may cause problems

Be advised that when the fix commences it will shut down all running processes and you may lose the desktop and icons, they will return on reboot

If you have Malwarebytes 1.6 or better installed please disable it for the duration of this run
To disable MBAM
Open the scanner and select the protection tab
Remove the tick from "Start with Windows"
Reboot and then run OTL
(http://i1224.photobucket.com/albums/ee362/Essexboy3/mbamstop.jpg)

Run OTL
Title: Re: win32:downloader-NZI
Post by: demontosome26 on May 08, 2012, 01:48:35 AM
Log posted.
Title: Re: win32:downloader-NZI
Post by: essexboy on May 08, 2012, 07:25:41 PM
How is the computer behaving now ?
Title: Re: win32:downloader-NZI
Post by: demontosome26 on May 09, 2012, 09:52:36 AM
The laptop is still running smoothly, but the scan is still picking up a threat.  I posted an attachment that lists the threat and it's whereabouts.
Title: Re: win32:downloader-NZI
Post by: Pondus on May 09, 2012, 09:55:48 AM
it is located in a restore point..

so should be gone if you delete your restore poinst
Title: Re: win32:downloader-NZI
Post by: essexboy on May 09, 2012, 09:21:13 PM
As Pondus said - reset the restore points and it will be history  ;D
Title: Re: win32:downloader-NZI
Post by: demontosome26 on May 11, 2012, 04:30:20 AM
I deleted the restore points and the infection is still there.  Attachment posted.
Title: Re: win32:downloader-NZI
Post by: essexboy on May 11, 2012, 08:22:31 PM
That one is in the OTL quarantine file

Which should have been deleted when you run the OTL cleanup button, did you do that ? 
Title: Re: win32:downloader-NZI
Post by: demontosome26 on May 14, 2012, 03:30:16 AM
Yes, but after running another scan it once again found an infection, so I decided to completely disable System Restore so it would eliminate all restore points.  From there I ran another scan and it didn't find any infections.  I'll let you know how everything is running within the next couple of days.