Arrival Details
This worm arrives via removable drives.
Installation
This worm drops the following copies of itself into the affected system:
- %System%\Thumbs.vbs
- %Windows%\Thumbs.vbs
(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.. %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
Autostart Technique
This worm adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
AVCTRL32 = wscript.exe %System%\Thumbs.vbs
Other System Modifications
This worm adds the following registry entries as part of its installation routine:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer
NoFolderOptions = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
DisableRegistryTools = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoRun = "1"
It modifies the following registry entries:
HKEY_CLASSES_ROOT\vbsfile\DefaultIcon
(default) = "%SystemRoot%\System32\shell32.dll,-154"
(Note: The default value data of the said registry entry is %SystemRoot%\System32\WScript.exe,2.)
HKEY_CLASSES_ROOT\VBSFile
(default) = "Data Base File"
(Note: The default value data of the said registry entry is VBScript Script File.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows Scripting Host\Script Extensions\.VBS
(default) = "Data Base File"
(Note: The default value data of the said registry entry is VBScript Script File.)
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowSuperHidden = "0"
(Note: The default value data of the said registry entry is 1.)
Propagation
This worm drops the following copies of itself in all physical and removable drives:
It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
The said .INF file contains the following strings:
[AUTORUN]
&Open=wscript.exe Thumbs.vbs
shell\open=Open
shell\open\Command=wscript.exe Thumbs.vbs
shell\Explore=&Explorer
shell\Explore\Command=Explorer.exe
shell\VBS.ALLYA.B\Command=wscript.exe Thumbs.vbs
shell\VBS.ALLYA.B\Default=1
[ABOUT]
VBSName=VBS.ALLYA
VBSVersion=ENCRYPTED.B-2009
VBSAUTHOR=Iwing/Indovirus
VBSNOTE=Viva Indovirus - Coba Decoded dan Pelajari ya.. :p
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
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.
Step 3
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
- AVCTRL32 = "wscript.exe %System%\Thumbs.vbs"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System
- DisableRegistryTools = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\Cur0rentVersion\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:
AVCTRL32 = "wscript.exe %System%\Thumbs.vbs" - 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:
NoFolderOptions = "1" - In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>Windows>CurrentVersion>Policies>System - In the right panel, locate and delete the entry:
DisableRegistryTools = "1" - In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>Windows>Cur0rentVersion>Policies>Explorer - In the right panel, locate and delete the entry:
NoRun = "1" - Close Registry Editor.
Step 4
Restore this modified registry value
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[ back ]
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\Explorer\Advanced
- From: ShowSuperHidden = "0"
To: ShowSuperHidden = "1"
- In HKEY_CLASSES_ROOT\vbsfile\DefaultIcon
- From: (default) = "%SystemRoot%\System32\shell32.dll,-154"
To: (default) = "%SystemRoot%\System32\WScript.exe,2"
- In HKEY_CLASSES_ROOT\VBSFile
- From: (default) = "Data Base File"
To: (default) = "VBScript Script File"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Scripting Host\Script Extensions\.VBS
- From: (default) = "Data Base File"
To: (default) = "VBScript Script File"
To restore the registry value this malware/grayware modified:
- Open Registry Editor. Click Start>Run, type REGEDIT in the text box provided, and then press Enter.
- In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>Windows>CurrentVersion>Explorer>Advanced - In the right panel, locate the registry value:
ShowSuperHidden = "0" - Right-click on the value name and choose Modify. Change the value data of this entry to:
ShowSuperHidden = "1" - In the left panel, double-click the following:
HKEY_CLASSES_ROOT>vbsfile>DefaultIcon - In the right panel, locate the registry value:
(default) = "%SystemRoot%\System32\shell32.dll,-154" - Right-click on the value name and choose Modify. Change the value data of this entry to:
(default) = "%SystemRoot%\System32\WScript.exe,2" - In the left panel, double-click the following:
HKEY_CLASSES_ROOT>VBSFile - In the right panel, locate the registry value:
(default) = "Data Base File" - Right-click on the value name and choose Modify. Change the value data of this entry to:
(default) = "VBScript Script File" - In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows Scripting Host>Script Extensions>.VBS - In the right panel, locate the registry value:
(default) = "Data Base File" - Right-click on the value name and choose Modify. Change the value data of this entry to:
(default) = "VBScript Script File" - Close Registry Editor.
Step 5
Search and delete AUTORUN.INF files created by VBS_OTORUN.ALLY that contain these strings
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[AUTORUN]
&Open=wscript.exe Thumbs.vbs
shell\open=Open
shell\open\Command=wscript.exe Thumbs.vbs
shell\Explore=&Explorer
shell\Explore\Command=Explorer.exe
shell\VBS.ALLYA.B\Command=wscript.exe Thumbs.vbs
shell\VBS.ALLYA.B\Default=1
[ABOUT]
VBSName=VBS.ALLYA
VBSVersion=ENCRYPTED.B-2009
VBSAUTHOR=Iwing/Indovirus
VBSNOTE=Viva Indovirus - Coba Decoded dan Pelajari ya.. :pTo identify and delete AUTORUN.INF files created:
- Right-click the Start button then choose Search... or Find..., depending on the version of Windows you are running.
- In the Named input box, type:
AUTORUN.INF - In the Look in: drop-down list, select a drive, then press Enter.
- Select the file, then open using Notepad.
- Check if the following lines are present in the file:
[AUTORUN]
&Open=wscript.exe Thumbs.vbs
shell\open=Open
shell\open\Command=wscript.exe Thumbs.vbs
shell\Explore=&Explorer
shell\Explore\Command=Explorer.exe
shell\VBS.ALLYA.B\Command=wscript.exe Thumbs.vbs
shell\VBS.ALLYA.B\Default=1
[ABOUT]
VBSName=VBS.ALLYA
VBSVersion=ENCRYPTED.B-2009
VBSAUTHOR=Iwing/Indovirus
VBSNOTE=Viva Indovirus - Coba Decoded dan Pelajari ya.. :p - If the lines are present, delete the file.
- Repeat steps 3 to 6 for the remaining AUTORUN.INF files in other remaining removable drives.
- Close Search Results.
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as VBS_OTORUN.ALLY. 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.
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