Worm.VBS.DUNIHI.CBQ
Windows
Threat Type: Worm
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
This Worm executes commands from a remote malicious user, effectively compromising the affected system.
It gathers certain information on the affected computer.
However, as of this writing, the said sites are inaccessible.
TECHNICAL DETAILS
Installation
This Worm drops the following copies of itself into the affected system:
- %User Temp%\{Malware Name}.vbs
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
It adds the following processes:
- "%System%\wscript.exe" //B "%User Temp%\{Malware Name}.vbs"
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
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 Name} = "wscript.exe //B "%User Temp%\{Malware Name}.vbs"
HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
{Malware Name} = "wscript.exe //B "%User Temp%\{Malware Name}.vbs"
Other System Modifications
This Worm adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\{Malware Name}.vbs
" " = {True/False} - {Date that the malware run}
Propagation
This Worm drops the following copy(ies) of itself in all removable drives:
- {Infected Drive}:\{Malware Filename}.vbs
It creates shortcut files (.LNK) disguised as folders or files located on the affected drives pointing to the malware copy.
Backdoor Routine
This Worm executes the following commands from a remote malicious user:
- "excecute" - Execute specified file
- "update" - Update malware code and restart the malware
- "uninstall" - Uninstall the malware
- "send" - Download and run a file from the C&C server
- "site-send" - Download and run a file
- "recv" - Send a file to the C&C server
- "enum-driver " - Send list of drives
- "enum-faf" - Enumerate folders and files contained in a folder
- "enum-process" - List running processes
- "cmd-shell" - Execute a command using Command Prompt
- "delete" - Delete a file or folder
- "exit-process" - Terminate a process
- "sleep" - Running script sleeps
It connects to the following URL(s) to send and receive commands from a remote malicious user:
- {BLOCKED}psup.{BLOCKED}.net:3076
Information Theft
This Worm gathers the following information on the affected computer:
- Computer Name
- Username
- OS Name
- OS Manufacturer
- OS BuildType
- OS Version
- OS Locale
- Windows Directory
- Total Memory
- OS Serial Number
- Every Antivirus Installed in System
- USB spreading report
Other Details
This Worm adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\{Malware Name}.vbs
However, as of this writing, the said sites are inaccessible.
SOLUTION
Step 1
Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.
Step 2
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 3
Restart in Safe Mode
Step 4
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 Name} = data: wscript.exe //B %User Temp%\{Malware Name}.vbs
- {Malware Name} = data: wscript.exe //B %User Temp%\{Malware Name}.vbs
- In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
- {Malware Name} = data: wscript.exe //B %User Temp%\{Malware Name}.vbs
- {Malware Name} = data: wscript.exe //B %User Temp%\{Malware Name}.vbs
Step 5
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\{Malware Name}.vbs
Step 6
Search and delete this file
- %User Temp%\{Malware Name}.vbs
- %User Startup%\{Malware Name}.vbs
- {Infected Drive}:\{Malware Filename}.vbs
- {Infected Drive}:\{Malware Filename}.lnk
Step 7
- Open a command prompt.
- For Windows 7 users, click Start, enter CMD in the Find input field, and press Enter.
- In the CMD console, enter the following:
ATTRIB [+R | -R] [+A | -A ] [+S | -S] [+H | -H] [+I | -I] [drive:][path][filename] [/S [/D] [/L]]
Where:
+ Activates an attribute
- Disables an attribute
R Read-only file attribute
A Archive file attribute
S System file attribute
H Hidden file attribute
I Indexed file attribute without content
[drive:][path][filename]
Specifies one or more files in the current folder and all its subfolders
/S Processes the corresponding files in the current folder and all its subfolders
/D Process folders
/L Act on the attributes of the symbolic link instrad of the target of the symbolic link
Example:
To make all files and folders (including subfolders visible in drive D:
ATTRIB –H D:\* /S /D
- Repeat the step above for folders and files from other drives or directories.
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as Worm.VBS.DUNIHI.CBQ. 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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