This spyware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It modifies the Internet Explorer Zone Settings.
It deletes the initially executed copy of itself.
Arrival Details
This spyware 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 spyware drops the following copies of itself into the affected system:
- C:\Program Files\Common Files\Beta\{random name 1}.exe.exe - for Windows XP and below
- C:\ProgramData\Beta\{random name 1}.exe.exe - for Vista and above
- C:\Users\All Users\Beta\{random name 1}.exe.exe - for Vista and above
It drops the following files:
- C:\Program Files\Common Files\Beta\desktop.ini -for Windows XP and below, deletes it afterwards
- C:\ProgramData\Beta\desktop.ini - for Vista and above, deletes it afterwards
It creates the following folders:
- C:\Program Files\Common Files\Beta\ - for Windows XP and below
- C:\ProgramData\Beta\ - for Vista and above
- C:\Users\All Users\Beta\ - for Vista and above
Autostart Technique
This spyware adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
Beta = "C:\Program Files\Common Files\Beta\{random name 1}.exe" - for Windows XP and below
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Beta = "C:\Program Files\Common Files\Beta\{random name 1}.exe" - for Windows XP and below
HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
Beta = "C:\ProgramData\Beta\{random name 1}.exe" - for Vista and above
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Beta = "C:\ProgramData\Beta\{random name 1}.exe" - for Vista and above
Other System Modifications
This spyware adds the following registry entries:
HKEY_CURRENT_USER\Software\Win7zip
Uuid = "{hex string}"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
{random name 1}.exe
DisableExceptionChainValidation = ""
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
rstrui.exe
Debugger = "{random name 2}.exe"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%Windows%\explorer.exe = "%Windows%\explorer.exe:*:Enabled"
Web Browser Home Page and Search Page Modification
This spyware modifies the Internet Explorer Zone Settings.
Other Details
This spyware connects to the following possibly malicious URL:
It deletes the initially executed copy of itself
Step 1
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
Step 2
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Step 3
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, Windows 7, and Windows Server 2008 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.
• For Windows 8, Windows 8.1, and Windows Server 2012 users
- Access the Charms bar by moving your mouse pointer to the upper right corner of the screen.
- Move your mouse pointer down and click Settings>Change your PC Settings.
- In the left panel, click General.
- In the right panel, scroll down to the bottom to find the Advanced startup section, then click the Restart now button and wait for the system to restart.
- In the Advanced Startup menu, click Troubleshoot>Advanced Options>Startup Settings>Restart and wait for the system to restart.
- In the Startup Settings menu, press 4 to enable safe mode.
Step 4
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
- Beta = "C:\Program Files\Common Files\Beta\{random}.exe" - for Windows XP and below
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- Beta = "C:\Program Files\Common Files\Beta\{random}.exe" - for Windows XP and below
- In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
- Beta = "C:\ProgramData\Beta\xsljqlofp.exe" - for Vista and above
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- Beta = "C:\ProgramData\Beta\xsljqlofp.exe" - for Vista and above
- In HKEY_CURRENT_USER\Software\Win7zip
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\{random name 1}.exe
- DisableExceptionChainValidation = ""
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\rstrui.exe
- Debugger = "{random name 2}.exe"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
- %Windows%\explorer.exe = "%Windows%\explorer.exe:*:Enabled"
To delete the registry value this malware created:
- Open Registry Editor. To do this:
» For Windows 2000, Windows XP, and Windows Server 2003 users, click Start>Run, type regedit in the text box provided, and then press Enter.
» For Windows Vista, Windows 7, and Windows Server 2008 users, click the Start button, type regedit in the Search input field then press Enter.
» For Windows 8, Windows 8.1, and Windows Server 2012 users, right-click on the lower left corner of the screen, click Run, type regedit in the text box provided, and then press Enter. - In the left panel of the Registry Editor window, double-click the following:
HKEY_LOCAL_MACHINE>Software>Microsoft>Windows>CurrentVersion>Run - In the right panel, locate and delete the entry:
Beta = "C:\Program Files\Common Files\Beta\{random}.exe" - for Windows XP and below - In the left panel of the Registry Editor window, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>Windows>CurrentVersion>Run - In the right panel, locate and delete the entry:
Beta = "C:\Program Files\Common Files\Beta\{random}.exe" - for Windows XP and below - Again In the right panel, locate and delete the entry:
Beta = "C:\ProgramData\Beta\xsljqlofp.exe" - for Vista and above - Again In the right panel, locate and delete the entry:
Beta = "C:\ProgramData\Beta\xsljqlofp.exe" - for Vista and above - In the left panel of the Registry Editor window, double-click the following:
HKEY_CURRENT_USER>Software>Win7zip - In the right panel, locate and delete the entry:
Uuid = "{hex string}" - In the left panel of the Registry Editor window, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Image File Execution Options>{random name 1}.exe - In the right panel, locate and delete the entry:
DisableExceptionChainValidation = "" - In the left panel of the Registry Editor window, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Image File Execution Options>rstrui.exe - In the right panel, locate and delete the entry:
Debugger = "{random name 2}.exe" - In the left panel of the Registry Editor window, double-click the following:
HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>SharedAccess>Parameters>FirewallPolicy>StandardProfile>AuthorizedApplications>List - In the right panel, locate and delete the entry:
%Windows%\explorer.exe = "%Windows%\explorer.exe:*:Enabled" - Close Registry Editor.
Step 5
Search and delete this file
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There may be some files that are hidden. Please make sure you check the
Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
- C:\Program Files\Common Files\Beta\desktop.ini -for Windows XP and below, deletes it afterwards
- C:\ProgramData\Beta\desktop.ini - for Vista and above, deletes it afterwards
To manually delete a malware/grayware file from an affected system:
• For Windows 2000, Windows XP, and Windows Server 2003:
- Right-click Start then click Search....
- In the File name* input box, type the following:
- C:\Program Files\Common Files\Beta\desktop.ini -for Windows XP and below, deletes it afterwards
- C:\ProgramData\Beta\desktop.ini - for Vista and above, deletes it afterwards
- In the Look In drop-down list, select My Computer then press Enter.
- Once located, select the file then press SHIFT+DELETE to delete it.
*Note: The file name input box title varies depending on the Windows version (e.g. Search for files or folders named or All or part of the file name.).
• For Windows Vista, Windows 7, Windows Server 2008, Windows 8, Windows 8.1, and Windows Server 2012:
- Open a Windows Explorer window.
- For Windows Vista, 7, and Server 2008 users, click Start>Computer.
- For Windows 8, 8.1, and Server 2012 users, right-click on the lower left corner of the screen, then click File Explorer.
- In the Search Computer/This PC input box, type:
- C:\Program Files\Common Files\Beta\desktop.ini -for Windows XP and below, deletes it afterwards
- C:\ProgramData\Beta\desktop.ini - for Vista and above, deletes it afterwards
- Once located, select the file then press SHIFT+DELETE to delete it.
*Note: Read the following Microsoft page if these steps do not work on Windows 7.
Step 6
Search and delete these folders
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Please make sure you check the
Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
- C:\Program Files\Common Files\Beta\ - for Windows XP and below
- C:\ProgramData\Beta\ - for Vista and above
- C:\Users\All Users\Beta\ - for Vista and above
To delete malware/grayware/spyware folders:
For Windows 2000, Windows XP, and Windows Server 2003:
- Right-click Start then click Search... or Find..., depending on the version of Windows you are running.
- In the File name* input box, type:
- C:\Program Files\Common Files\Beta\ - for Windows XP and below
- C:\ProgramData\Beta\ - for Vista and above
- C:\Users\All Users\Beta\ - for Vista and above
- In the Look In drop-down list, select My Computer, then press Enter.
- Once located, select the folder then press SHIFT+DELETE to permanently delete the folder.
- Repeat steps 2 to 4 for the remaining folders:
- C:\Program Files\Common Files\Beta\ - for Windows XP and below
- C:\ProgramData\Beta\ - for Vista and above
- C:\Users\All Users\Beta\ - for Vista and above
*Note: The file name input box title varies depending on the Windows version (e.g. Search for files or folders named or All or part of the file name.).
For Windows Vista, Windows 7, Windows Server 2008, Windows 8, Windows 8.1, and Windows Server 2012:
- Open a Windows Explorer window.
- For Windows Vista, 7, and Server 2008 users, click Start>Computer.
- For Windows 8, 8.1, and Server 2012 users, right-click on the lower left corner of the screen, then click File Explorer.
- In the Search Computer/This PC input box, type:
- C:\Program Files\Common Files\Beta\ - for Windows XP and below
- C:\ProgramData\Beta\ - for Vista and above
- C:\Users\All Users\Beta\ - for Vista and above
- Once located, select the file then press SHIFT+DELETE to permanently delete the folder.
- Repeat steps 2-3 for the remaining folders:
- C:\Program Files\Common Files\Beta\ - for Windows XP and below
- C:\ProgramData\Beta\ - for Vista and above
- C:\Users\All Users\Beta\ - for Vista and above
*Note: Read the following Microsoft page if these steps do not work on Windows 7.
Step 7
Reset Internet security settings
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To reset Internet security settings:
- Close all Internet browser windows.
- Open Control Panel. To do this:
• On Windows 2000
Click Start>Settings>Control Panel
• On Windows XP, Server 2003, Vista, and 7
Click Start>Control Panel - Double-click Internet Options.
- In the Internet Properties window, click the Security tab.
- For each Web content zone, click on the Default Level button to set each zone to the default setting.
- Click OK.
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_NEUREVT.YYXW. 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.
