WORM_VBNA.BH
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Worm
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
This worm connects to a server and waits for commands coming from a remote user. Once connected, it may perform various routines.
This worm arrives by connecting affected removable drives to a system. It may be unknowingly downloaded by a user while visiting malicious websites.
It drops copies of itself in all 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.
TECHNICAL DETAILS
94,208 bytes
EXE
Yes
10 May 2011
Arrival Details
This worm arrives by connecting affected removable drives to a system.
It may be unknowingly downloaded by a user while visiting malicious websites.
Installation
This worm drops the following copies of itself into the affected system:
- %System%\drivers\{malware name}.exe
(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.)
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\policies\
Explorer\Run
Microsoft Driver Setup = "%system%\drivers\{malware name}.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Microsoft Driver Setup = "%system%\drivers\{malware name}.exe"
Propagation
This worm creates the following folders in all removable drives:
- RECYCLER
It drops copies of itself in all 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.
NOTES:
This worm connects to a server and waits for commands coming from a remote user. Once connected, it may perform various routines such as:
- Propagate via USB
- Port scanning
- Scan/kill threads
- Download a file
- Update itself
- Create a process
SOLUTION
8.900
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
Terminate the malware/grayware/spyware process:
Step 3
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\Windows\CurrentVersion\policies\Explorer\Run
- Microsoft Driver Setup = %system%\drivers\{malware name}.exe
- Microsoft Driver Setup = %system%\drivers\{malware name}.exe
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- Microsoft Driver Setup = %system%\drivers\{malware name}.exe
- Microsoft Driver Setup = %system%\drivers\{malware name}.exe
Step 4
Search and delete this file
Step 5
Search and delete these folders
Step 6
Scan your computer with your Trend Micro product to delete files detected as WORM_VBNA.BH. 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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