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Virus deleting antivirus software at end of download


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4 replies to this topic

#1 Sar1

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Posted 21 May 2010 - 11:00 AM

I have malware on my system that I need to get rid of. I have attempted to bring the system up in safe mode with and without networking. I run Spybot S&D, Ad-Aware, and Malwarebytes one after the other and they all 3 find problems and fix them. After this, if I started with networking, I've tried to download Avira's AntiVirus free personal version and others, but each time the download is complete, the file vanishes from my download folder. The longer I go between running the 3 programs mentioned above, the more they find on the system. This happens even if I don't open my browser (Mozilla FireFox) to go to any websites. I have HijackThis installed.

Edit: Moved topic from XP to the more appropriate forum. ~ Animal

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#2 boopme

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Posted 21 May 2010 - 02:59 PM

Hello, Please post the last MBAm scan log.
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.



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 Sar1

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Posted 21 May 2010 - 11:47 PM

Here is the most recent MBAM log.

Malwarebytes' Anti-Malware 1.46
www.malwarebytes.org

Database version: 4122

Windows 5.1.2600 Service Pack 3
Internet Explorer 7.0.5730.13

5/21/2010 6:13:44 AM
mbam-log-2010-05-21 (06-13-44).txt

Scan type: Full scan (C:\|D:\|E:\|)
Objects scanned: 224908
Time elapsed: 38 minute(s), 9 second(s)

Memory Processes Infected: 0
Memory Modules Infected: 1
Registry Keys Infected: 0
Registry Values Infected: 0
Registry Data Items Infected: 0
Folders Infected: 0
Files Infected: 8

Memory Processes Infected:
(No malicious items detected)

Memory Modules Infected:
C:\WINDOWS\system32\opaqcx.dll (Trojan.Agent) -> Delete on reboot.

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:\Documents and Settings\All Users\Application Data\oUROau8O.exe (Backdoor.Sinowal) -> Quarantined and deleted successfully.
C:\System Volume Information\_restore{2A423C4A-D1EA-48AB-94C1-555A96126BC5}\RP12\A0003141.exe (Backdoor.Sinowal) -> Quarantined and deleted successfully.
C:\System Volume Information\_restore{2A423C4A-D1EA-48AB-94C1-555A96126BC5}\RP14\A0003995.exe (Backdoor.Sinowal) -> Quarantined and deleted successfully.
C:\System Volume Information\_restore{2A423C4A-D1EA-48AB-94C1-555A96126BC5}\RP14\A0004118.exe (Backdoor.Sinowal) -> Quarantined and deleted successfully.
C:\System Volume Information\_restore{2A423C4A-D1EA-48AB-94C1-555A96126BC5}\RP15\A0004123.exe (Backdoor.Sinowal) -> Quarantined and deleted successfully.
C:\System Volume Information\_restore{2A423C4A-D1EA-48AB-94C1-555A96126BC5}\RP15\A0004145.exe (Backdoor.Sinowal) -> Quarantined and deleted successfully.
C:\System Volume Information\_restore{2A423C4A-D1EA-48AB-94C1-555A96126BC5}\RP16\A0004150.exe (Backdoor.Sinowal) -> Quarantined and deleted successfully.
C:\WINDOWS\system32\opaqcx.dll (Trojan.Agent) -> Delete on reboot.

I tried to download ATF and SuperAntiSpyware to the desktop but that will not work. The icon for Super is on the desktop, but when I click on it, I get a popup error message that says "C:\Documents and Settings\Mike\Desktop\SUPERAntiSpyware.exe is not a valid Win32 application.". I right clicked the icon and looked at the properties and it is 0 bytes. This is the same thing that happens when I try to download any Antivirus software.

When I try to download ATF, it shows up on my Firefox downloads but the icon never appears on the desktop. If I right click on it on the downloads screen, OPEN and Open Containing Folder are not valid options to select.

This was all done in normal mode. I can get to safe mode if that is necessary.

While I wait on instructions for what to do next, I am going to try to download ATF and Super to a USB stick on another computer and see if I can get them installed with that.

Thank you

#4 Sar1

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Posted 22 May 2010 - 09:02 AM

Update

Downloaded ATF and SUPER to a USB stick from another computer. I tried to install SUPER from the USB to my computer but the install failed saying System Administrator has set policies to prevent this installation. Went back to the other computer and installed and updated SUPER on the USB. I ran Super on my computer from the USB and this is the log from that run.

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

Generated 05/22/2010 at 05:26 AM

Application Version : 4.37.1000

Core Rules Database Version : 4969
Trace Rules Database Version: 2781

Scan type : Complete Scan
Total Scan Time : 02:40:43

Memory items scanned : 252
Memory threats detected : 0
Registry items scanned : 5379
Registry threats detected : 6
File items scanned : 96278
File threats detected : 4

Trojan.Agent/Gen-Virut
[novavapp] C:\DOCUMENTS AND SETTINGS\MIKE\APPLICATION DATA\MICROSOFT\INTERNET EXPLORER\NOVAVAPPQ.EXE
C:\DOCUMENTS AND SETTINGS\MIKE\APPLICATION DATA\MICROSOFT\INTERNET EXPLORER\NOVAVAPPQ.EXE
[novavappr] C:\DOCUMENTS AND SETTINGS\MIKE\APPLICATION DATA\MICROSOFT\INTERNET EXPLORER\NOVAVAPPS.EXE
C:\DOCUMENTS AND SETTINGS\MIKE\APPLICATION DATA\MICROSOFT\INTERNET EXPLORER\NOVAVAPPS.EXE
[novavapp] C:\DOCUMENTS AND SETTINGS\MIKE\APPLICATION DATA\MICROSOFT\INTERNET EXPLORER\NOVAVAPPQ.EXE
[novavappr] C:\DOCUMENTS AND SETTINGS\MIKE\APPLICATION DATA\MICROSOFT\INTERNET EXPLORER\NOVAVAPPS.EXE

Rootkit.Agent/Gen-TDS[Pragma]
HKU\.DEFAULT\Software\Pragma
HKU\S-1-5-18\Software\Pragma

Trojan.Agent/Gen
C:\DOCUMENTS AND SETTINGS\MIKE\APPLICATION DATA\MICROSOFT\INTERNET EXPLORER\NOVAVAPPQ .EXE

Adware.Tracking Cookie
C:\WINDOWS\system32\config\systemprofile\Cookies\system@ad.wsod[2].txt


After running SUPER from the USB, I was able to install SUPER onto my computer and update it. It normally takes a day or two after cleaning, to start seeing symptoms from the malware, which get progressively worse the longer it goes. I will wait for further instructions if any and post any problems if they occur.

#5 boopme

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Posted 22 May 2010 - 03:16 PM

Hello .. we have some bad news and hate to make this post.

It normally takes a day or two after cleaning, to start seeing symptoms from the malware, which get progressively worse the longer it goes. I will wait for further instructions if any and post any problems if they occur.


As the bolded part states we have an incurable infection called Virut.

Your system is infected with a nasty variant of Virut, a polymorphic file infector with IRCBot functionality which infects .exe, .scr files, downloads more malicious files to your system, and opens a back door that compromises your computer.

With this particular infection, the safest solution and only sure way to remove it effectively is to reformat and reinstall the OS.

According to this Norman White Paper Assessment of W32/Virut, some variants can infect the HOSTS file and block access to security related web sites. Other variants of virut can even penetrate and infect .exe files within compressed files (.zip, .cab, rar). The Virux and Win32/Virut.17408 variants are an even more complex file infectors which can embed an iframe into the body of web-related files and infect script files (.php, .asp, .htm, .html, .xml). When Virut creates infected files, it also creates non-functional files that are corrupted beyond repair and in some instances can disable Windows File Protection. In many cases the infected files cannot be disinfected properly by your anti-virus. When disinfection is attempted, the files become corrupted and the system may become irreparable. The longer virut remains on a computer, the more critical system files will become infected and corrupt so the degree of infection can vary.

The virus disables Windows File Protection by injecting code into the "winlogon.exe" process that patches system code in memory.

CA Virus detail of W32/Virut

The virus has a number of bugs in its code, and as a result it may misinfect a proportion of executable files....some W32/Virut.h infections are corrupted beyond repair.

McAfee Risk Assessment and Overview of W32/Virut

There are bugs in the viral code. When the virus produces infected files, it also creates non-functional files that also contain the virus...Due to the damaged caused to files by virut it's possible to find repaired but corrupted files. They became corrupted by the incorrect writing of the viral code during the process of infection. undetected, corrupted files (possibly still containing part of the viral code) can also be found. this is caused by incorrectly written and non-function viral code present in these files.

AVG Overview of W32/VirutVirut is commonly spread via a flash drive (usb, pen, thumb, jump) infection using RUNDLL32.EXE and other malicious files. It is often contracted and spread by visiting remote, crack and keygen sites. These type of sites are infested with a smörgåsbord of malware and a major source of system infection.

...warez and crack web pages are being used by cybercriminals as download sites for malware related to VIRUT and VIRUX. Searches for serial numbers, cracks, and even antivirus products like Trend Micro yield malcodes that come in the form of executables or self-extracting files...quick links in these sites also lead to malicious files. Ads and banners are also infection vectors...

Keygen and Crack Sites Distribute VIRUX and FakeAV

However, the CA Security Advisor Research Blog have found MySpace user pages carrying the malicious Virut URL. Either way you can end up with a computer system so badly damaged that recovery is not possible and it cannot be repaired. When that happens there is nothing you can do besides reformatting and reinstalling the OS.

If your computer was used for online banking, has credit card information or other sensitive data on it, you should disconnect from the Internet until your system is cleaned. All passwords should be changed immediately to include those used for banking, email, eBay, paypal and online forums. You should consider them to be compromised. You should change each password using a clean computer and not the infected one. If not, an attacker may get the new passwords and transaction information. If using a router, you need to reset it with a strong logon/password so the malware cannot gain control before connect again. Banking and credit card institutions should be notified of the possible security breach. Because your computer was compromised please read:Since virut is not effectively disinfectable, your best option is to perform a full reformat as there is no guarantee this infection can be completely removed. In most instances it may have caused so much damage to your system files that it cannot be completely cleaned or repaired. In many cases the infected files cannot be deleted and anti-malware scanners cannot disinfect them properly. Many experts in the security community believe that once infected with this type of malware, the best course of action is to reformat and reinstall the OS. Reinstalling Windows without first wiping the entire hard drive with a repartition and/or format will not remove the infection. The reinstall will only overwrite the Windows files. Any malware on the system will still be there afterwards. Please read:
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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