This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It disables Task Manager, Registry Editor, and Folder Options.
It deletes itself after execution.
Arrival Details
This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Installation
This backdoor drops the following copies of itself into the affected system:
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
Autostart Technique
This backdoor adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Device Security Driver = "devicesec.exe"
Other System Modifications
This backdoor modifies the following file(s):
- %System%\drivers\etc\hosts
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
It deletes the following files:
- %Program Files%\Windows Media Player\npdrmv2.zip
- %Program Files%\Windows Media Player\npds.zip
- %Windows%\Fonts\GLOBAL~1.COM
- %Windows%\Fonts\GLOBAL~2.COM
- %Windows%\Fonts\GLOBAL~3.COM
- %Windows%\Fonts\GLOBAL~4.COM
- %Windows%\Microsoft.NET\Framework\v2.0.50727\CONFIG\MACHIN~1.COM
- %Windows%\Microsoft.NET\Framework\v2.0.50727\CONFIG\WEBCON~1.COM
- %Windows%\Microsoft.NET\Framework\v4.0.30319\Config\MACHIN~1.COM
- %Windows%\Microsoft.NET\Framework\v4.0.30319\Config\WEBCON~1.COM
- %Windows%\Microsoft.NET\Framework\v4.0.30319\WPF\Fonts\GLOBAL~1.COM
- %Windows%\Microsoft.NET\Framework\v4.0.30319\WPF\Fonts\GLOBAL~2.COM
- %Windows%\Microsoft.NET\Framework\v4.0.30319\WPF\Fonts\GLOBAL~3.COM
- %Windows%\Microsoft.NET\Framework\v4.0.30319\WPF\Fonts\GLOBAL~4.COM
- %System%\chcp.com
- %System%\command.com
- %System%\diskcomp.com
- %System%\diskcopy.com
- %System%\edit.com
- %System%\format.com
- %System%\graftabl.com
- %System%\graphics.com
- %System%\kb16.com
- %System%\loadfix.com
- %System%\mode.com
- %System%\more.com
- %System%\tree.com
- %System%\win.com
It adds the following registry keys:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Windows\CurrentVersion\Policies\
System
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows NT\SystemRestore
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows NT\SystemRestore
DisableConfig = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer
NoClose = "1"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\SystemRestore
DisableSR = "1"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\wscsvc
Start = "4"
(Note: The default value data of the said registry entry is 2.)
It creates the following registry entry(ies) to disable Task Manager, Registry Tools and Folder Options:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
Disabletaskmgr = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
Disableregistrytools = "1"
Other Details
This backdoor deletes itself after execution.
This report is generated via an automated analysis system.
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Step 2
Restart in Safe Mode
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To restart in Safe Mode:
• For Windows 2000 users
- Restart your computer.
- Press F8 when you see the Starting Windows bar at the bottom of the screen.
- Choose the Safe Mode option from the Windows Advanced Options menu then press Enter.
• For Windows XP users
- Restart your computer.
- Press F8 after the Power-On Self Test (POST) routine is done. If the Windows Advanced Options menu does not appear, try restarting then pressing F8 several times when the POST screen appears.
- Choose the Safe Mode option from the Windows Advanced Options menu then press Enter.
• For Windows Server 2003 users
- Restart your computer.
- Press F8 after Windows starts up. If the Windows Advanced Options menu does not appear, try restarting again and pressing F8 several times afterward.
- On the Windows Advanced Option menu, use the arrow keys to select Safe Mode then press Enter.
• For Windows Vista and Windows 7 users
- Restart your computer.
- Press F8 after the Power-On Self Test (POST) routine is done. If the Advanced Boot Options menu does not appear, try restarting and then pressing F8 several times after the POST screen is displayed.
- On the Advanced Boot Options menu, use the arrow keys to select the Safe Mode option, and then press Enter.
Step 3
Enable Registry Editor, Task Manager, and Folder options
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By doing this step, you also enable other applications/programs disabled by this malware/grayware/spyware.
To enable Registry Editor, Task Manager, and Folder options:
- Open Notepad. To do this:
- For Windows 2000, XP, and Server 2003 users:
Click Start>Run, type Notepad in the text box provided, then press Enter. - For Windows Vista and 7 users:
Click start. Type Notepad , then press Enter.
- Copy and paste the following script:
- Save this file as C:\RESTORE.VBS.
- Click Start>Run again, type C:\RESTORE.VBS in the text box provided, then press Enter.
- Click Yes at the prompt of the message box to execute the .VBS file.
Step 4
Delete this registry key
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Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies
- In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies
To delete the registry key this malware/grayware created:
- Open Registry Editor. Click Start>Run, type REGEDIT, then press Enter.
- In the left panel, double-click the following:
HKEY_CURRENT_USER>SOFTWARE>Microsoft>Windows>CurrentVersion>Policies - Still in the left panel, locate and delete the key:
System - In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Policies>Microsoft>Windows NT - Still in the left panel, locate and delete the key:
SystemRestore - In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows>CurrentVersion>policies - Still in the left panel, locate and delete the key:
Explorer - Close Registry Editor.
Step 5
Delete this registry value
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Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- Device Security Driver = "devicesec.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT\SystemRestore
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer
To delete the registry value this malware/grayware created:
- Open Registry Editor. Click Start>Run, type REGEDIT, then press Enter.
- In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows>CurrentVersion>Run - In the right panel, locate and delete the entry:
Device Security Driver = "devicesec.exe" - In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Policies>Microsoft>Windows NT>SystemRestore - In the right panel, locate and delete the entry:
DisableConfig = "1" - In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows>CurrentVersion>policies>Explorer - In the right panel, locate and delete the entry:
NoClose = "1" - Close Registry Editor.
Step 6
Restore these modified registry values
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Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SystemRestore
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\wscsvc
- From: Start = "4"
To: Start = ""2""
To restore registry values this malware/grayware modified:
- Open Registry Editor. To do this:
- On Windows 2000, XP, and Server 2003:
Click Start>Run, type REGEDIT in the text box provided, and then press Enter. - On Windows Vista and 7:
Click the Start button, type REGEDIT in the Search input field then press Enter.
- In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>SystemRestore - In the right panel, locate the registry value:
DisableSR = "1" - In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SYSTEM>ControlSet001>Services>wscsvc - In the right panel, locate the registry value:
Start = "4" - Right-click on the value name and choose Modify. Change the value data of this entry to:
Start = "2" - Close Registry Editor.
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_IRCBOT.BFW. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.
Step 8
Restore deleted/modified files and/or registry entries from backup
*Note: Only Microsoft-related files/keys/values will be restored. If this malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.
- %System%\drivers\etc\hosts
Step 9
Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.
- %Program Files%\Windows Media Player\npdrmv2.zip
- %Program Files%\Windows Media Player\npds.zip
- %Windows%\Fonts\GLOBAL~1.COM
- %Windows%\Fonts\GLOBAL~2.COM
- %Windows%\Fonts\GLOBAL~3.COM
- %Windows%\Fonts\GLOBAL~4.COM
- %Windows%\Microsoft.NET\Framework\v2.0.50727\CONFIG\MACHIN~1.COM
- %Windows%\Microsoft.NET\Framework\v2.0.50727\CONFIG\WEBCON~1.COM
- %Windows%\Microsoft.NET\Framework\v4.0.30319\Config\MACHIN~1.COM
- %Windows%\Microsoft.NET\Framework\v4.0.30319\Config\WEBCON~1.COM
- %Windows%\Microsoft.NET\Framework\v4.0.30319\WPF\Fonts\GLOBAL~1.COM
- %Windows%\Microsoft.NET\Framework\v4.0.30319\WPF\Fonts\GLOBAL~2.COM
- %Windows%\Microsoft.NET\Framework\v4.0.30319\WPF\Fonts\GLOBAL~3.COM
- %Windows%\Microsoft.NET\Framework\v4.0.30319\WPF\Fonts\GLOBAL~4.COM
- %System%\chcp.com
- %System%\command.com
- %System%\diskcomp.com
- %System%\diskcopy.com
- %System%\edit.com
- %System%\format.com
- %System%\graftabl.com
- %System%\graphics.com
- %System%\kb16.com
- %System%\loadfix.com
- %System%\mode.com
- %System%\more.com
- %System%\tree.com
- %System%\win.com
