WORM_VBNA.SMG
Windows 2000, XP, Server 2003
Threat Type: Worm
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
Propagates via removable drives
This worm arrives by connecting affected removable drives to a system. It arrives via removable drives.
It modifies registry entries to hide files with System and Read-only attributes.
It drops copies of itself in all removable drives.
TECHNICAL DETAILS
98,304 bytes
PE
Yes
20 Jul 2010
Arrival Details
This worm arrives by connecting affected removable drives to a system.
It arrives via removable drives.
Installation
This worm drops the following copies of itself into the affected system:
- %User Profile%\{Random File Name}.exe
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
Autostart Technique
This worm adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{Malware File Name Without Extension} = %User Profile%\{Random File Name}.exe
Other System Modifications
This worm modifies the following registry entries to hide files with System and Read-only attributes:
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 copies of itself in all removable drives.
The said .INF file contains the following strings:
[AutoRuN]
aCtioN=Open folder to view files
shELlExecuTE={Malware File Name}.exe
iCON=%SYStEMROOT%\sySTeM32\ShELl32.DLL,4
USEauToplay=1
Other Details
Based on analysis of the codes, it has the following capabilities:
- It also drops shortcut files with the following file names in removable drives that points to its dropped copy:
- Documents.lnk
- Music.lnk
- New Folder.lnk
- Passwords.lnk
- Pictures.lnk
- Video.lnk
SOLUTION
8.900
07.322.09
20 Jul 2010
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
Terminate a process file/s detected as WORM_VBNA.SMG
*Note: If the detected file/s is/are not displayed in theWindows Task Manager, continue doing the next steps.
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- {Malware File Name Without Extension} = %User Profile%\{Random File Name}.exe
- {Malware File Name Without Extension} = %User Profile%\{Random File Name}.exe
Step 4
Restore this modified 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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- From: ShowSuperHidden = 0
To: 1
- From: ShowSuperHidden = 0
Step 5
Search and delete these files
Music.lnk
New Folder.lnk
Passwords.lnk
Pictures.lnk
Video.lnk
Step 6
Search and delete AUTORUN.INF files created by WORM_VBNA.SMG that contain these strings
aCtioN=Open folder to view files
shELlExecuTE={Malware File Name}.exe
iCON=%SYStEMROOT%\sySTeM32\ShELl32.DLL,4
USEauToplay=1
Step 7
Scan your computer with your Trend Micro product to delete files detected as WORM_VBNA.SMG. 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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