WORM_VB.DIL
Trojan:Win32/Otran (Microsoft); W32/Rabb.worm (McAfee); Suspicious.MH690 (Symantec); Worm.Win32.VB.ge (Kaspersky); Trojan.Win32.Packer.RLPackV1.15-V1.17a (ep) (Sunbelt); Worm/VB.BAD (AVG)
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Worm
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This worm 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.
TECHNICAL DETAILS
Arrival Details
This worm arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Autostart Technique
This worm adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{4bf41072-b2b1-21c1-b5c1-0305f4155515}
StubPath = "%System%\JK~.exe"
Other System Modifications
This worm adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{4bf41072-b2b1-21c1-b5c1-0305f4155515}
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{1C0F29D4-5E6C-44ED-AABD-7E77A9A8C9C1}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{1C0F29D4-5E6C-44ED-AABD-7E77A9A8C9C1}\2.0
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{1C0F29D4-5E6C-44ED-AABD-7E77A9A8C9C1}\2.0\
FLAGS
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{1C0F29D4-5E6C-44ED-AABD-7E77A9A8C9C1}\2.0\
0
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{1C0F29D4-5E6C-44ED-AABD-7E77A9A8C9C1}\2.0\
0\win32
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{1C0F29D4-5E6C-44ED-AABD-7E77A9A8C9C1}\2.0\
HELPDIR
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{123E26D9-0733-437C-B579-A3B1F32A5DDE}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{123E26D9-0733-437C-B579-A3B1F32A5DDE}\ProxyStubClsid
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{123E26D9-0733-437C-B579-A3B1F32A5DDE}\ProxyStubClsid32
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{123E26D9-0733-437C-B579-A3B1F32A5DDE}\TypeLib
HKEY_CLASSES_ROOT\CLSID\{6D11DB99-60E8-4D12-9F2A-199B625C2584}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{6D11DB99-60E8-4D12-9F2A-199B625C2584}\InprocServer32
HKEY_CLASSES_ROOT\AsHide.sHide
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{123E26D9-0733-437C-B579-A3B1F32A5DDE}\TypeLib
Version = "2.0"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{6D11DB99-60E8-4D12-9F2A-199B625C2584}
ProgID = "AsHide.sHide"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{6D11DB99-60E8-4D12-9F2A-199B625C2584}\InprocServer32
ThreadingModel = "Apartment"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{6D11DB99-60E8-4D12-9F2A-199B625C2584}
TypeLib = "{1C0F29D4-5E6C-44ED-AABD-7E77A9A8C9C1}"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{6D11DB99-60E8-4D12-9F2A-199B625C2584}
VERSION = "2.0"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AsHide.sHide
Clsid = "{6D11DB99-60E8-4D12-9F2A-199B625C2584}"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{123E26D9-0733-437C-B579-A3B1F32A5DDE}
ProxyStubClsid = "{00020424-0000-0000-C000-000000000046}"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{123E26D9-0733-437C-B579-A3B1F32A5DDE}
ProxyStubClsid32 = "{00020424-0000-0000-C000-000000000046}"
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 = "0"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
DisableRegistryTools = "1"
It deletes the following registry keys:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Active Setup\Installed Components\{4bf41072-b2b1-21c1-b5c1-0305f4155515}
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\SafeBoot\Minimal\
{4D36E967-E325-11CE-BFC1-08002BE10318}
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\SafeBoot\Network\
{4D36E967-E325-11CE-BFC1-08002BE10318}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AsHide.sHide\Clsid
Dropping Routine
This worm drops the following files:
- %Windows%\ILTZ.bat
- %Windows%\IOTZ.bat
- %Windows%\DLL.bat
- %Windows%\GHO.bat
- d:\Rabbit.exe
- e:\Rabbit.exe
- f:\Rabbit.exe
- %System Root%\Rabbit.exe
- h:\Rabbit.exe
- g:\Rabbit.exe
- d:\AutoRun.inf
- e:\AutoRun.inf
- f:\AutoRun.inf
- %System Root%\AutoRun.inf
- h:\AutoRun.inf
- g:\AutoRun.inf
- %Windows%\loveRabbit.bat
- %System%\sha~.bat
(Note: %Windows% is the Windows folder, which is usually C:\Windows.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %System% is the Windows system folder, which is usually C:\Windows\System32.)
Other Details
This worm connects to the following possibly malicious URL:
This report is generated via an automated analysis system.
SOLUTION
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
Step 3
Enable Registry Editor, Task Manager, and Folder options
Step 4
Delete this registry key
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\Active Setup\Installed Components
- {4bf41072-b2b1-21c1-b5c1-0305f4155515}
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies
- System
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib
- {1C0F29D4-5E6C-44ED-AABD-7E77A9A8C9C1}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{1C0F29D4-5E6C-44ED-AABD-7E77A9A8C9C1}
- 2.0
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{1C0F29D4-5E6C-44ED-AABD-7E77A9A8C9C1}\2.0
- FLAGS
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{1C0F29D4-5E6C-44ED-AABD-7E77A9A8C9C1}\2.0
- 0
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{1C0F29D4-5E6C-44ED-AABD-7E77A9A8C9C1}\2.0\0
- win32
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{1C0F29D4-5E6C-44ED-AABD-7E77A9A8C9C1}\2.0
- HELPDIR
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
- {123E26D9-0733-437C-B579-A3B1F32A5DDE}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{123E26D9-0733-437C-B579-A3B1F32A5DDE}
- ProxyStubClsid
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{123E26D9-0733-437C-B579-A3B1F32A5DDE}
- ProxyStubClsid32
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{123E26D9-0733-437C-B579-A3B1F32A5DDE}
- TypeLib
- In HKEY_CLASSES_ROOT\CLSID
- {6D11DB99-60E8-4D12-9F2A-199B625C2584}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{6D11DB99-60E8-4D12-9F2A-199B625C2584}
- InprocServer32
- In HKEY_CLASSES_ROOT
- AsHide.sHide
Step 5
Delete this registry value
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\Active Setup\Installed Components\{4bf41072-b2b1-21c1-b5c1-0305f4155515}
- StubPath = "%System%\JK~.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{123E26D9-0733-437C-B579-A3B1F32A5DDE}\TypeLib
- Version = "2.0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{6D11DB99-60E8-4D12-9F2A-199B625C2584}
- ProgID = "AsHide.sHide"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{6D11DB99-60E8-4D12-9F2A-199B625C2584}\InprocServer32
- ThreadingModel = "Apartment"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{6D11DB99-60E8-4D12-9F2A-199B625C2584}
- TypeLib = "{1C0F29D4-5E6C-44ED-AABD-7E77A9A8C9C1}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{6D11DB99-60E8-4D12-9F2A-199B625C2584}
- VERSION = "2.0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AsHide.sHide
- Clsid = "{6D11DB99-60E8-4D12-9F2A-199B625C2584}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{123E26D9-0733-437C-B579-A3B1F32A5DDE}
- ProxyStubClsid = "{00020424-0000-0000-C000-000000000046}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{123E26D9-0733-437C-B579-A3B1F32A5DDE}
- ProxyStubClsid32 = "{00020424-0000-0000-C000-000000000046}"
Step 6
Search and delete these components
- %Windows%\ILTZ.bat
- %Windows%\IOTZ.bat
- %Windows%\DLL.bat
- %Windows%\GHO.bat
- d:\Rabbit.exe
- e:\Rabbit.exe
- f:\Rabbit.exe
- %System Root%\Rabbit.exe
- h:\Rabbit.exe
- g:\Rabbit.exe
- d:\AutoRun.inf
- e:\AutoRun.inf
- f:\AutoRun.inf
- %System Root%\AutoRun.inf
- h:\AutoRun.inf
- g:\AutoRun.inf
- %Windows%\loveRabbit.bat
- %System%\sha~.bat
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_VB.DIL. 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 these deleted registry keys/values from backup
*Note: Only Microsoft-related keys/values will be restored. If the malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.
- In HKEY_CURRENT_USER\SOFTWARE\Microsoft\Active Setup\Installed Components
- {4bf41072-b2b1-21c1-b5c1-0305f4155515}
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SafeBoot\Minimal
- {4D36E967-E325-11CE-BFC1-08002BE10318}
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SafeBoot\Network
- {4D36E967-E325-11CE-BFC1-08002BE10318}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AsHide.sHide
- Clsid
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