WORM_VBNA.SMD9

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.

File Size: 196,608 bytes

File Type: EXE

Memory Resident: Yes

Initial Samples Received Date: 16 May 2012

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_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
tiaal = "%User Profile%\tiaal.exe /T"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
tiaal = "%User Profile%\tiaal.exe /P"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
tiaal = "%User Profile%\tiaal.exe /N"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
tiaal = "%User Profile%\tiaal.exe /X"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
tiaal = "%User Profile%\tiaal.exe /B"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
tiaal = "%User Profile%\tiaal.exe /o"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
tiaal = "%User Profile%\tiaal.exe /y"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
tiaal = "%User Profile%\tiaal.exe /w"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
tiaal = "%User Profile%\tiaal.exe /D"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
tiaal = "%User Profile%\tiaal.exe /m"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
tiaal = "%User Profile%\tiaal.exe /S"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
tiaal = "%User Profile%\tiaal.exe /t"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
tiaal = "%User Profile%\tiaal.exe /c"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
tiaal = "%User Profile%\tiaal.exe /E"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
tiaal = "%User Profile%\tiaal.exe /K"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
tiaal = "%User Profile%\tiaal.exe /Y"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
tiaal = "%User Profile%\tiaal.exe /p"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
tiaal = "%User Profile%\tiaal.exe /e"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
rouqoey = "%User Profile%\rouqoey.exe /K"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
rouqoey = "%User Profile%\rouqoey.exe /R"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
rouqoey = "%User Profile%\rouqoey.exe /o"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
rouqoey = "%User Profile%\rouqoey.exe /f"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
rouqoey = "%User Profile%\rouqoey.exe /y"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
rouqoey = "%User Profile%\rouqoey.exe /E"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
rouqoey = "%User Profile%\rouqoey.exe /B"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
rouqoey = "%User Profile%\rouqoey.exe /r"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
rouqoey = "%User Profile%\rouqoey.exe /a"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
rouqoey = "%User Profile%\rouqoey.exe /s"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
rouqoey = "%User Profile%\rouqoey.exe /k"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
rouqoey = "%User Profile%\rouqoey.exe /W"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
rouqoey = "%User Profile%\rouqoey.exe /w"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
rouqoey = "%User Profile%\rouqoey.exe /G"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
rouqoey = "%User Profile%\rouqoey.exe /j"

It registers as a system service to ensure its automatic execution at every system startup by adding the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\.netbt

Other System Modifications

This worm deletes the following files:

%User Profile%\2cv.exe
%User Profile%\tiaal.exe
%User Profile%\zcv.exe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

It adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\Run

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowSuperHidden = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\WindowsUpdate\
AU
NoAutoUpdate = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
65429 = "%User Temp%\msdubmnax.pif"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\.netbt
Type = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\.netbt
Start = "3"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\.netbt
ImagePath = "\?"

Dropping Routine

This worm drops the following files:

%User Temp%\msdubmnax.pif
U
L
2387fd88\L\suianxvn
2387fd88\@
2387fd88\cfg.ini
%User Profile%\html.html

(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, XP, and Server 2003.. %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

Other Details

This worm connects to the following possibly malicious URL:

http://kingkong.{BLOCKED}c.ru:30880/b.php

This report is generated via an automated analysis system.

Minimum Scan Engine: 9.200

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

[ Learn More ]

Step 3

Delete this registry key

[ Learn More ]

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\SYSTEM\CurrentControlSet\services
- .netbt

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer
- Run

Step 4

Delete this registry value

[ Learn More ]

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
- tiaal = "%User Profile%\tiaal.exe /T"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- tiaal = "%User Profile%\tiaal.exe /P"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- tiaal = "%User Profile%\tiaal.exe /N"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- tiaal = "%User Profile%\tiaal.exe /X"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- tiaal = "%User Profile%\tiaal.exe /B"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- tiaal = "%User Profile%\tiaal.exe /o"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- tiaal = "%User Profile%\tiaal.exe /y"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- tiaal = "%User Profile%\tiaal.exe /w"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- tiaal = "%User Profile%\tiaal.exe /D"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- tiaal = "%User Profile%\tiaal.exe /m"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- tiaal = "%User Profile%\tiaal.exe /S"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- tiaal = "%User Profile%\tiaal.exe /t"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- tiaal = "%User Profile%\tiaal.exe /c"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- tiaal = "%User Profile%\tiaal.exe /E"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- tiaal = "%User Profile%\tiaal.exe /K"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- tiaal = "%User Profile%\tiaal.exe /Y"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- tiaal = "%User Profile%\tiaal.exe /p"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- tiaal = "%User Profile%\tiaal.exe /e"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- rouqoey = "%User Profile%\rouqoey.exe /K"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- rouqoey = "%User Profile%\rouqoey.exe /R"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- rouqoey = "%User Profile%\rouqoey.exe /o"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- rouqoey = "%User Profile%\rouqoey.exe /f"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- rouqoey = "%User Profile%\rouqoey.exe /y"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- rouqoey = "%User Profile%\rouqoey.exe /E"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- rouqoey = "%User Profile%\rouqoey.exe /B"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- rouqoey = "%User Profile%\rouqoey.exe /r"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- rouqoey = "%User Profile%\rouqoey.exe /a"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- rouqoey = "%User Profile%\rouqoey.exe /s"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- rouqoey = "%User Profile%\rouqoey.exe /k"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- rouqoey = "%User Profile%\rouqoey.exe /W"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- rouqoey = "%User Profile%\rouqoey.exe /w"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- rouqoey = "%User Profile%\rouqoey.exe /G"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- rouqoey = "%User Profile%\rouqoey.exe /j"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- ShowSuperHidden = "0"

In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU
- NoAutoUpdate = "1"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run
- 65429 = "%User Temp%\msdubmnax.pif"

In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\.netbt
- Type = "1"

In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\.netbt
- Start = "3"

In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\.netbt
- ImagePath = "\?"

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_CURRENT_USER>Software>Microsoft>Windows>CurrentVersion>Run
In the right panel, locate and delete the entry:
tiaal = "%User Profile%\tiaal.exe /T"
Again In the right panel, locate and delete the entry:
tiaal = "%User Profile%\tiaal.exe /P"
Again In the right panel, locate and delete the entry:
tiaal = "%User Profile%\tiaal.exe /N"
Again In the right panel, locate and delete the entry:
tiaal = "%User Profile%\tiaal.exe /X"
Again In the right panel, locate and delete the entry:
tiaal = "%User Profile%\tiaal.exe /B"
Again In the right panel, locate and delete the entry:
tiaal = "%User Profile%\tiaal.exe /o"
Again In the right panel, locate and delete the entry:
tiaal = "%User Profile%\tiaal.exe /y"
Again In the right panel, locate and delete the entry:
tiaal = "%User Profile%\tiaal.exe /w"
Again In the right panel, locate and delete the entry:
tiaal = "%User Profile%\tiaal.exe /D"
Again In the right panel, locate and delete the entry:
tiaal = "%User Profile%\tiaal.exe /m"
Again In the right panel, locate and delete the entry:
tiaal = "%User Profile%\tiaal.exe /S"
Again In the right panel, locate and delete the entry:
tiaal = "%User Profile%\tiaal.exe /t"
Again In the right panel, locate and delete the entry:
tiaal = "%User Profile%\tiaal.exe /c"
Again In the right panel, locate and delete the entry:
tiaal = "%User Profile%\tiaal.exe /E"
Again In the right panel, locate and delete the entry:
tiaal = "%User Profile%\tiaal.exe /K"
Again In the right panel, locate and delete the entry:
tiaal = "%User Profile%\tiaal.exe /Y"
Again In the right panel, locate and delete the entry:
tiaal = "%User Profile%\tiaal.exe /p"
Again In the right panel, locate and delete the entry:
tiaal = "%User Profile%\tiaal.exe /e"
Again In the right panel, locate and delete the entry:
rouqoey = "%User Profile%\rouqoey.exe /K"
Again In the right panel, locate and delete the entry:
rouqoey = "%User Profile%\rouqoey.exe /R"
Again In the right panel, locate and delete the entry:
rouqoey = "%User Profile%\rouqoey.exe /o"
Again In the right panel, locate and delete the entry:
rouqoey = "%User Profile%\rouqoey.exe /f"
Again In the right panel, locate and delete the entry:
rouqoey = "%User Profile%\rouqoey.exe /y"
Again In the right panel, locate and delete the entry:
rouqoey = "%User Profile%\rouqoey.exe /E"
Again In the right panel, locate and delete the entry:
rouqoey = "%User Profile%\rouqoey.exe /B"
Again In the right panel, locate and delete the entry:
rouqoey = "%User Profile%\rouqoey.exe /r"
Again In the right panel, locate and delete the entry:
rouqoey = "%User Profile%\rouqoey.exe /a"
Again In the right panel, locate and delete the entry:
rouqoey = "%User Profile%\rouqoey.exe /s"
Again In the right panel, locate and delete the entry:
rouqoey = "%User Profile%\rouqoey.exe /k"
Again In the right panel, locate and delete the entry:
rouqoey = "%User Profile%\rouqoey.exe /W"
Again In the right panel, locate and delete the entry:
rouqoey = "%User Profile%\rouqoey.exe /w"
Again In the right panel, locate and delete the entry:
rouqoey = "%User Profile%\rouqoey.exe /G"
Again In the right panel, locate and delete the entry:
rouqoey = "%User Profile%\rouqoey.exe /j"
In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>Windows>CurrentVersion>Explorer>Advanced
In the right panel, locate and delete the entry:
ShowSuperHidden = "0"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Policies>Microsoft>Windows>WindowsUpdate>AU
In the right panel, locate and delete the entry:
NoAutoUpdate = "1"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows>CurrentVersion>policies>Explorer>Run
In the right panel, locate and delete the entry:
65429 = "%User Temp%\msdubmnax.pif"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SYSTEM>ControlSet001>Services>.netbt
In the right panel, locate and delete the entry:
Type = "1"
Again In the right panel, locate and delete the entry:
Start = "3"
Again In the right panel, locate and delete the entry:
ImagePath = "\?"
Close Registry Editor.

Step 5

Search and delete these files

[ Learn More ]

There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.

%User Temp%\msdubmnax.pif
U
L
2387fd88\L\suianxvn
2387fd88\@
2387fd88\cfg.ini
%User Profile%\html.html

Step 6

Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_VBNA.SMD9. 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 7

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

%User Profile%\2cv.exe
%User Profile%\tiaal.exe
%User Profile%\zcv.exe

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