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Removal instructions for XP Defender


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#1 Metallica

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Posted 22 December 2012 - 08:09 AM

Please note that this rogue uses several names:
Sofar we have found:
  • XP Defender
  • Vista Defender
  • Win7 Defender
  • Win Server Defender

What is XP Defender?

The Malwarebytes research team has determined that XP Defender is a fake anti-malware application. These so-called "rogues" use intentional false positives to convince users that their systems have been compromised. Then they try to sell you their software, claiming it will remove these threats. In extreme cases the false threats are actually the very trojans that advertise or even directly install the rogue. You are strongly advised to follow our removal instructions below.

How do I know if I am infected with XP Defender?

This is how the main screen of the rogue application looks:

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You will find these icons in your taskbar and on your desktop:

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And see these warnings:

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How did XP Defender get on my computer?

Rogue programs use different methods for spreading themselves. This particular one was offered as a flash player on a site with explicit content.

How do I remove XP Defender?

Our program Malwarebytes Anti-Malware can detect and remove this rogue application, but because this rogue blocks the normal use of programs we will use Chameleon to remove it.

  • If Malwarebytes Anti-Malware is not installed on the infected computer.
    In order for this to work, you could need a second PC which is not infected and a USB flash drive or blank CD and CD burner or some other means to transfer files from one computer to the other.
  • Download Chameleon from the Malwarebytes site.
  • Unzip the contents of the zip-file to a folder in a convenient location on the infected computer.
  • If you were unable to do this directly on the infected PC, then copy the folder from the clean computer to the infected one.
  • Make certain that your infected PC is connected to the internet and then open the folder you created or copied, on your infected computer and double-click on firefox.com.
  • Follow the onscreen instructions to press a key to continue and Chameleon will proceed to download and install Malwarebytes Anti-Malware for you.
  • Once it has done this, it will attempt to update Malwarebytes Anti-Malware, click OK when it says that the database was updated successfully
  • Next, Malwarebytes Anti-Malware will automatically open and perform a Quick scan
  • Upon completion of the scan, if anything has been detected, click on Show Results
  • Have Malwarebytes Anti-Malware remove any threats that are detected and click Yes if prompted to reboot your computer to allow the removal process to complete
  • After your computer restarts, open Malwarebytes Anti-Malware and perform one last Quick scan to verify that there are no remaining threats

  • If Malwarebytes Anti-Malware is already installed on the infected computer.
    In order for this to work, you must already have Malwarebytes Anti-Malware version 1.60 or later already installed on your infected PC.
  • Open the program folder for Malwarebytes Anti-Malware (normally C:\Program Files\Malwarebytes' Anti-Malware or C:\Program Files (x86)\Malwarebytes' Anti-Malware)
  • Once there, open the Chameleon folder
  • Next, double-click on firefox.com. This should result in a black DOS/command prompt window opening up.
  • Press any key to continue as it says in the window
  • Malwarebytes Chameleon will proceed to update Malwarebytes Anti-Malware, so ensure that you are connected to the internet if possible
  • Once the update completes and it says your database is updated, click on OK
  • Malwarebytes Chameleon will then terminate any threats running in memory, which may take a while, so please be patient
  • Upon completion, Malwarebytes Anti-Malware will open automatically and perform a Quick scan
  • Once the scan is complete, click on Show Results and remove any threats that are found by clicking Remove Selected
  • If prompted to restart your computer to complete the removal process, click Yes
  • After your computer restarts, open Malwarebytes Anti-Malware and perform one last Quick scan to verify that there are no remaining threats

Below is what you can expect to see in the Command prompt after succesfully using Chameleon.
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Is there anything else I need to do to get rid of XP Defender?

  • The shortcut called XP Defender on the desktop can be deleted if it belonged to the rogue.

How would the full version of Malwarebytes Anti-Malware help protect me?

We hope our application has helped you eradicate this malicious software. If your current security solution let this infection through, you might please consider purchasing the FULL version of Malwarebytes Anti-Malware for additional protection.

As you can see below the full version of Malwarebytes Anti-Malware would have protected you against the XP Defender rogue. It would have warned you before the rogue could install itself, giving you a chance to stop it before it became too late.


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Technical details for experts

Signs in a HijackThis log:
C:\Documents and Settings\All Users\Application Data\pcdfdata\E5121B7B2D8DB4ACD640BB95B0B606E8.exe

O4 - HKCU\..\Run: [pcdfsvc] C:\Documents and Settings\All Users\Application Data\pcdfdata\E5121B7B2D8DB4ACD640BB95B0B606E8.exe /min

Note: the filename is random

Alterations made by the installer:

File System
===============
Adds the folder C:\Documents and Settings\All Users\Application Data\pcdfdata
Adds the file vl.bin"="13:02 22/12/12 1164320 bytes
Adds the file uninst.ico"="13:02 22/12/12 5430 bytes
Adds the file support.ico"="13:02 22/12/12 5430 bytes
Adds the file E5121B7B2D8DB4ACD640BB95B0B606E8.exe"="07:53 19/12/12 86704 bytes
Adds the file defs.bin"="13:02 22/12/12 961460 bytes
Adds the file config.bin"="13:05 22/12/12 112 bytes
Adds the file app.ico"="13:02 22/12/12 5430 bytes
In the existing folder C:\Documents and Settings\All Users\Desktop
Adds the file XP Defender.lnk"="13:02 22/12/12 2040 bytes
Adds the folder C:\Documents and Settings\All Users\Start Menu\Programs\XP Defender
Adds the file XP Defender.lnk"="13:02 22/12/12 2052 bytes
Adds the file XP Defender Help and Support.lnk"="13:02 22/12/12 2078 bytes
Adds the file Remove XP Defender.lnk"="13:02 22/12/12 2094 bytes

Registry
===============
[HKEY_CLASSES_ROOT\.exe]
"(Default)"="'4g'"
"Content Type"="'application/x-mt���
�4'"
[HKEY_CLASSES_ROOT\.exe\DefaultIcon]
"(Default)"="'%1'"
[HKEY_CLASSES_ROOT\.exe\shell\runas\command]
"IsolatedCommand"="'"%1" %*'"
"(Default)"="'"%1" %*'"
[HKEY_CLASSES_ROOT\.exe\shell\open\command]
"IsolatedCommand"="'"%1" %*'"
"(Default)"="'"C:\Documents and Settings\All Users\Application Data\pcdfdata\E5121B7B2D8DB4ACD640BB95B0B606E8.exe" /ex "%1" %*'"
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\pcdfdata]
"DisplayIcon"="'C:\Documents and Settings\All Users\Application Data\pcdfdata\E5121B7B2D8DB4ACD640BB95B0B606E8.exe,0'"
"UninstallString"="'C:\Documents and Settings\All Users\Application Data\pcdfdata\E5121B7B2D8DB4ACD640BB95B0B606E8.exe /tout'"
"InstallLocation"="'C:\Documents and Settings\All Users\Application Data\pcdfdata'"
"DisplayName"="'XP Defender'"
[HKEY_CURRENT_USER\Software\Classes\.exe]
"Content Type"="'application/x-m'"
"(Default)"="'4g'"
[HKEY_CURRENT_USER\Software\Classes\.exe\shell\runas\command]
"IsolatedCommand"="'"%1" %*'"
"(Default)"="'"%1" %*'"
[HKEY_CURRENT_USER\Software\Classes\.exe\shell\open\command]
"IsolatedCommand"="'"%1" %*'"
"(Default)"="'"C:\Documents and Settings\All Users\Application Data\pcdfdata\E5121B7B2D8DB4ACD640BB95B0B606E8.exe" /ex "%1" %*'"
[HKEY_CURRENT_USER\Software\Classes\.exe\DefaultIcon]
"(Default)"="'%1'"
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run]
"pcdfsvc"="'C:\Documents and Settings\All Users\Application Data\pcdfdata\E5121B7B2D8DB4ACD640BB95B0B606E8.exe /min'"


Malwarebytes Anti-Malware log:
Malwarebytes Anti-Malware 1.65.1.1000
www.malwarebytes.org

Database version: v2012.12.22.02

Windows XP Service Pack 3 x86 NTFS
Internet Explorer 8.0.6001.18702
:: MBAM-D3E8C91ACC [administrator]

12/22/2012 1:11:11 PM
mbam-log-2012-12-22 (13-11-11).txt

Scan type: Quick scan
Scan options enabled: Memory | Startup | Registry | File System | Heuristics/Extra | Heuristics/Shuriken | PUP | PUM
Scan options disabled: P2P
Objects scanned: 180801
Time elapsed: 51 second(s)

Memory Processes Detected: 0
(No malicious items detected)

Memory Modules Detected: 0
(No malicious items detected)

Registry Keys Detected: 1
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\pcdfdata (Trojan.LameShield) -> Quarantined and deleted successfully.

Registry Values Detected: 3
HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run|pcdfsvc (Trojan.LameShield) -> Data: C:\Documents and Settings\All Users\Application Data\pcdfdata\E5121B7B2D8DB4ACD640BB95B0B606E8.exe /min
-> Quarantined and deleted successfully.
HKCR\.exe| (Rogue.PCDefenderPlus) -> Data: 4g -> Delete on reboot.
HKCR\.exe\shell\open\command| (Rogue.PCDefenderPlus) -> Data: "C:\Documents and Settings\All Users\Application Data\pcdfdata\E5121B7B2D8DB4ACD640BB95B0B606E8.exe" /ex "%1" %*
-> Quarantined and deleted successfully.

Registry Data Items Detected: 2
HKCR\.exe| (Hijacked.exeFile) -> Bad: (4g) Good: (exefile) -> Quarantined and repaired successfully.
HKCR\.exe| (PUM.HijackExefiles) -> Bad: (4g) Good: (exefile) -> Quarantined and repaired successfully.

Folders Detected: 1
C:\Documents and Settings\All Users\Application Data\pcdfdata (Rogue.PCDefenderPlus) -> Quarantined and deleted successfully.

Files Detected: 7
C:\Documents and Settings\All Users\Application Data\pcdfdata\E5121B7B2D8DB4ACD640BB95B0B606E8.exe (Trojan.LameShield) -> Quarantined and deleted successfully.
C:\Documents and Settings\All Users\Application Data\pcdfdata\defs.bin (Rogue.PCDefenderPlus) -> Quarantined and deleted successfully.
C:\Documents and Settings\All Users\Application Data\pcdfdata\app.ico (Rogue.PCDefenderPlus) -> Quarantined and deleted successfully.
C:\Documents and Settings\All Users\Application Data\pcdfdata\config.bin (Rogue.PCDefenderPlus) -> Quarantined and deleted successfully.
C:\Documents and Settings\All Users\Application Data\pcdfdata\support.ico (Rogue.PCDefenderPlus) -> Quarantined and deleted successfully.
C:\Documents and Settings\All Users\Application Data\pcdfdata\uninst.ico (Rogue.PCDefenderPlus) -> Quarantined and deleted successfully.
C:\Documents and Settings\All Users\Application Data\pcdfdata\vl.bin (Rogue.PCDefenderPlus) -> Quarantined and deleted successfully.

(end)


As mentioned before the full version of Malwarebytes Anti-Malware could have protected your computer against this threat.
We use different ways of protecting your computer(s):
  • Dynamically Blocks Malware Sites & Servers
  • Malware Execution Prevention
Save yourself the hassle and get protected.
Pieter Arntz
Malwarebytes Blogger

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