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Content is republished with permission from Malwarebytes.

What is Backdoor.Agent?

The Malwarebytes research team has determined that Backdoor.Agent is a generic detection for a Trojan horse that opens a back-door on the compromised computer and connects to Chat (IRC) channels in an attempt to spread to other users.

How do I know if I am infected with "Nice picture" Backdoor.Agent?

The icon of the downloaded file looks like that of a jpg, but the files does have the extension ".exe":



When run the program will open a browser window connecting to myspace.com and facebook.
It will also send out messages through chat channels that the computer is connected to.
For an example seen on Facebook look further below.

How did "Nice picture" Backdoor.Agent get on my computer?

Backdoors use different methods for spreading themselves. This particular one spreads on chat channels sending out this type of message:



How do I remove "Nice picture" Backdoor.Agent?

Our program Malwarebytes' Anti-Malware can detect and remove this backdoor.

• Please download Malwarebytes' Anti-Malware to your desktop.
• Double-click mbam-setup.exe and follow the prompts to install the program.
• At the end, be sure a check-mark is placed next to the following:
  
  
  • Update Malwarebytes' Anti-Malware
  • Launch Malwarebytes' Anti-Malware
• Then click Finish.
• If an update is found, it will download and install the latest version.
• Once the program has loaded, select Perform quick scan, then click Scan.
• When the scan is complete, click OK, then Show Results to view the results.
• Be sure that everything is checked, and click Remove Selected. Reboot your computer if prompted.
• When completed, a log will open in Notepad. The backdoor should now be gone.

Is there anything else I need to do to get rid of "Nice picture" Backdoor.Agent?

• No, Malwarebytes' Anti-Malware removes "Nice picture" Backdoor.Agent completely.

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 "Nice picture" Backdoor.Agent. It would have warned you before the rogue could install itself, giving you a chance to stop it before it became too late.

And, as detection was added to the definitions only hours after the first signs, Malwarebytes'Anti-Malware detected the backdoor using heuristic detection methods before that time.

Technical details for experts

Signs in a HijackThis log:

c:\windows\nvsvc32.exe

O4 - HKLM\..\Run: [NVIDIA driver monitor] c:\windows\nvsvc32.exe
O4 - HKCU\..\Run: [NVIDIA driver monitor] c:\windows\nvsvc32.exe

Alterations made by the installer:

  File System
  ===============
    In the existing folder C:\WINDOWS
      Adds the file nvsvc32.exe"="10:37 06/02/11 139264 bytes


  Registry
  ===============
    [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
      "NVIDIA driver monitor"="'c:\windows\nvsvc32.exe'"
    [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Terminal Server\Install\Software\Microsoft\Windows\CurrentVersion\Run]
      "NVIDIA driver monitor"="'c:\windows\nvsvc32.exe'"
    [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\NAP\Netsh]
      "ControlFlags"="1"
      "Active"="1"
      "LogSessionName"="stdout."
    [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List]
      "C:\Documents and Settings\{username}\Desktop\facebook-pic0004416951102-jpg.exe"= "'c:\windows\nvsvc32.exe:*:Enabled:NVIDIA driver monitor'"
    [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run]
      "NVIDIA driver monitor"="'c:\windows\nvsvc32.exe'"

Malwarebytes' Anti-Malware log:

Malwarebytes' Anti-Malware 1.50.1.1100
www.malwarebytes.org

Database version: 5689

Windows 5.1.2600 Service Pack 3
Internet Explorer 6.0.2900.5512

2/6/2011 3:41:57 PM
mbam-log-2011-02-06 (15-41-57).txt

Scan type: Quick scan
Objects scanned: 123703
Time elapsed: 2 minute(s), 3 second(s)

Memory Processes Infected: 1
Memory Modules Infected: 0
Registry Keys Infected: 0
Registry Values Infected: 3
Folders Infected: 0
Files Infected: 2

Memory Processes Infected:
c:\WINDOWS\nvsvc32.exe (Backdoor.Agent) -> 464 -> Unloaded process successfully.

Memory Modules Infected:
(No malicious items detected)

Registry Keys Infected:
(No malicious items detected)

Registry Values Infected:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\NVIDIA driver monitor (Backdoor.Agent) -> Value: NVIDIA driver monitor -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\NVIDIA driver monitor (Backdoor.Agent) -> Value: NVIDIA driver monitor -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Terminal Server\Install\Software\Microsoft\Windows\CurrentVersion\Run\NVIDIA driver monitor (Backdoor.Agent) -> Value: NVIDIA driver monitor -> Quarantined and deleted successfully.

Folders Infected:
(No malicious items detected)

Files Infected:
c:\WINDOWS\nvsvc32.exe (Backdoor.Agent) -> Delete on reboot.
c:\documents and settings\{username}\Desktop\facebook-pic0004416951102-jpg.exe (Backdoor.Agent) -> Quarantined and deleted successfully.

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.