HELP! New virus which attacks Avast and can't be detected!!

[Avastfan1]

Dear Forum,

I have found a virus-infected file on a USB stick. Neither Avast nor MBAM can detect it. It destroyed my friend's computer and he was running Avast and MBAM resident protection.

I became suspicious when I inserted the USB stick into my computer (whilst holding down the left shift key). The reason is that I saw an autorun file AND the culprit 'wyskq6lt.exe'.

How can I send the file to Avast? It is not detected so I can't send it from the chest.

- A full boot-time scan with Avast of my system: 0 files or folders infected
- A quick MBAM scan: No malicious software found.
- A quick SAS scan: No malicious software found.

How can I be sure that this piece of malware is not on my computer? What would you do?

Please help me! I am really freaking out!!!

Avastfan1

[essexboy]

Hi lets have a quick look

GMER Rootkit Scanner - Download - Homepage

• Download GMER
• Extract the contents of the zipped file to desktop.
• Double click GMER.exe.

• If it gives you a warning about rootkit activity and asks if you want to run a full scan...click on NO, then use the following settings for a more complete scan..
  
• In the right panel, you will see several boxes that have been checked. Ensure the following are UNCHECKED ...
  • IAT/EAT
  • Drives/Partition other than Systemdrive (typically C:\)
  • Show All (don't miss this one)
  
  Click the image to enlarge it
  

• Then click the Scan button & wait for it to finish.
• Once done click on the [Save..] button, and in the File name area, type in "ark.txt" 
  
• Save the log where you can easily find it, such as your desktop.

**Caution**Rootkit scans often produce false positives. Do NOT take any action on any "<--- ROOKIT" entries
Please copy and paste the report into your Post.

THEN

Download OTL  to your Desktop

• Double click on the icon to run it. Make sure all other windows are closed and to let it run uninterrupted.
• Under the Custom Scan box paste this in

netsvcs
%SYSTEMDRIVE%\*.exe
/md5start
eventlog.dll
scecli.dll
netlogon.dll
cngaudit.dll
sceclt.dll
ntelogon.dll
logevent.dll
iaStor.sys
nvstor.sys
atapi.sys
IdeChnDr.sys
viasraid.sys
AGP440.sys
vaxscsi.sys
nvatabus.sys
viamraid.sys
nvata.sys
nvgts.sys
iastorv.sys
ViPrt.sys
eNetHook.dll
ahcix86.sys
KR10N.sys
nvstor32.sys
ahcix86s.sys
nvrd32.sys
symmpi.sys
adp3132.sys
mv61xx.sys
nvraid.sys
/md5stop
%systemroot%\*. /mp /s
CREATERESTOREPOINT
%systemroot%\system32\*.dll /lockedfiles
%systemroot%\Tasks\*.job /lockedfiles
%systemroot%\system32\drivers\*.sys /lockedfiles
%systemroot%\System32\config\*.sav
%systemroot%\system32\drivers\*.sys /90

• Click the Quick Scan button. Do not change any settings unless otherwise told to do so. The scan wont take long.
  
  • When the scan completes, it will open two notepad windows. OTL.Txt and Extras.Txt. These are saved in the same location as OTL.
    
  • Post both logs

[Avastfan1]

Thanks Essexboy!

I am running them as we speak.

Will post back very soon.

[Avastfan1]

Hi Essexboy,

I have the three logs you requested (Extras.txt, OTL.txt and ark.txt). The forum won't let me post them. Apparently they exceed the 10000 word count limit.

Could I possibly email them to you? If you were so kind to allow that, please PM me your email address and I will send them across for your perusal.

Thanks again for all your help. It really is very much appreciated.

Avastfan1

[mkis]

Hi Essexboy

It does appear at this stage to be a new variant - searches so far only turn up detections this month.

But also appears bundled with herrs.exe  http://www.threatexpert.com/files/herss.exe.html

and the cvasds0, ~1, ~2 dlls   http://www.threatexpert.com/files/cvasds0.dll.html

[akama1]

hey did'nt u try using malwarebytes file assasin tool? u run that program inside mbam and then select a file to delete forever with no traces left behind try that its easier

[Avastfan1]

Avast finally detected it a Win32: Malware-gen. I have sent it from the chest to Avast with the option.

A full boot-time scan showed no infection on my system. MBAM quick scan didn't show an infection either.

When I inserted the USB stick, I held left shift down. Hence I hope this prevented the autorun thing.

I have completed the scans you requested and await your further instructions on how to post them here Essexboy.

Thanks

Avastfan1

[Pondus]

Hi Essexboy,

I have the three logs you requested (Extras.txt, OTL.txt and ark.txt). The forum won't let me post them. Apparently they exceed the 10000 word count limit.

Could I possibly email them to you? If you were so kind to allow that, please PM me your email address and I will send them across for your perusal.

Thanks again for all your help. It really is very much appreciated.

Avastfan1

see down left corner: Additional Options > Attach ......

[Avastfan1]

Hej Pondus!

Tack för det! Jag har skickat dem till Essexboy på pm. Men tusen tack för rådet och hjälpen!

Ha det bra

Avastfan1

@Essexboy: I have pmed you the logs you requested. I await your further instructions my lord :-) Thanks for your help!!!

[Pondus]

Okidoki .....

[essexboy]

I have checked the logs and I can see nothing untoward, no rootkits and no apparent malware files from the last 14 days.  No modifications to system files

However, to put your mind at rest

Download ComboFix from one of these locations:


Link 1
Link 2


* IMPORTANT !!! Save ComboFix.exe to your Desktop

• Disable your AntiVirus and AntiSpyware applications, usually via a right click on the System Tray icon. They may otherwise interfere with our tools
• Double click on ComboFix.exe & follow the prompts.
• As part of it's process, ComboFix will check to see if the Microsoft Windows Recovery Console is installed. With malware infections being as they are today, it's strongly recommended to have this pre-installed on your machine before doing any malware removal.  It will allow you to boot up into a special recovery/repair mode that will allow us to more easily help you should your computer have a problem after an attempted removal of malware.
• Follow the prompts to allow ComboFix to download and install the Microsoft Windows Recovery Console, and when prompted, agree to the End-User License Agreement to install the Microsoft Windows Recovery Console.

**Please note: If the Microsoft Windows Recovery Console is already installed, ComboFix will continue it's malware removal procedures.

Once the Microsoft Windows Recovery Console is installed using ComboFix, you should see the following message:




Click on Yes, to continue scanning for malware.

When finished, it shall produce a log for you.  Please include the C:\ComboFix.txt in your next reply.

[Avastfan1]

Hi Essexboy,

After reading your post I was elated. I downloaded ComboFix, followed your instructions and disabled Avast, MBAM and PCTools Firewall. Let Combofix run.

- It downloaded the Microsoft Recovery Console
- Successfully installed it
- The blue box showed the completed stages and it reached 50
- Then it rebooted my computer
- The two-second delay with the black screen occurred as ComboFix said it would
- I didn't press anything and let it continue to the logon screen
- I logged on to my normal administrator account
- The ComboFix blue box came up and it said 'Preparing log file' and under it 'Don't run any programs until ComboFix is finished
- I think at the end it said deleting some set.tmp files from the IE directory as well as
      - system32\.....\lmhosts
      - system32\pwdmon.dll
- I let the computer boot as normal
- All programs loaded successfully (including Avast, MBAM and PCTools Firewall)
- Only difference was a Windows message appearing saying that Automatic Updates is turned off
- I already had Automatic Updates turned off, however the little message bubble never used to appear
- PCTools Firewall came up with a few warnings, however I allowed every single one of them and clicked apply
- ComboFix then just stayed on that screen with the above message
- I waited half an hour but it still stayed like that
- I closed the box and rebooted
- Now the black screen and 'which system do you want to boot with' appears each time
- I looked in C:\ but there is not ComboFix.txt
- However, I just found a file ComboFix in C:\ComboFix\ which I have PMed to you.

Please help me! Now I am really worried that I did something wrong! Has ComboFix somehow now messed up my computer?

It appears to boot ok, however I do not know what ComboFix has done.

I do know that it is a powerful program though. Please help me!

Yours sincerely,

A very worried Avastfan1

[essexboy]

To fix the boot issue is easy - CF installed the recovery console which is now recognised as a boot system

Right click my computer and select properties
On the Advanced tab select Startup and Recovery Settings...
Remove the tick from Time to display list of Operating systems
OK out and reboot
Fixt 

[Avastfan1]

Hi Essexboy,

I will hold off on the boot issue at the moment. Unfortunately Combofix did the same thing.

I have PMed a summary and the new log.

Please advise what I should do now.

Kind regards,

(an increasingly worried) Avastfan1

[essexboy]

Combofix worked and all looks good - Run flash drive disinfector and let me know what problems you now have