JS_OBFUS.VTG
Trojan:Win32/Bumat!rts (Microsoft); Generic.dx!baql (McAfee); Trojan.ADH (Symantec); ARC:NSIS, [data0001]:Trojan-Clicker.Win32.Agent.mcv, [360se.knl]:Trojan.JS.Agent.bor, [360se.knl]:Tr (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Dropped:Trojan.JS.QBW (FSecure)
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Trojan 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 Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Other System Modifications
This Trojan deletes the following files:
- %User Temp%\nsq1.tmp
- %User Profile%\QUICK LAUNCH\Launch Internet Explorer Browser.lnk
(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.)
It adds the following registry keys:
HKEY_CLASSES_ROOT\.knl
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
FileExts\.jse\OpenWithList
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
RecentDocs\.knl
HKEY_CLASSES_ROOT\.rrls
HKEY_CLASSES_ROOT\.rrls\PersistentHandler
HKEY_CLASSES_ROOT\.rrls\ShellEx\
{000214EE-0000-0000-C000-000000000046}
HKEY_CLASSES_ROOT\.rrls\ShellEx\
{000214F9-0000-0000-C000-000000000046}
HKEY_CLASSES_ROOT\.rrls\ShellEx\
{00021500-0000-0000-C000-000000000046}
HKEY_CLASSES_ROOT\.rrls\ShellEx\
{CABB0DA0-DA57-11CF-9974-0020AFD79762}
HKEY_CLASSES_ROOT\.rrls\ShellEx\
{FBF23B80-E3F0-101B-8488-00AA003E56F8}
HKEY_CURRENT_USER\Software\Classes\
.rrls
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\PropertySystem\
PropertyHandlers\.rrls
HKEY_CLASSES_ROOT\.qa
HKEY_CLASSES_ROOT\qafile
HKEY_CLASSES_ROOT\qafile\DefaultIcon
HKEY_CLASSES_ROOT\qafile\CLSID
HKEY_CLASSES_ROOT\qafile\shell
HKEY_CLASSES_ROOT\qafile\shell\
open
HKEY_CLASSES_ROOT\qafile\shell\
open\command
HKEY_CLASSES_ROOT\qafile\shellex\
IconHandler
HKEY_CLASSES_ROOT\qafile\shellex\
ContextMenuHandlers
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
HideDesktopIcons
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
HideDesktopIcons\NewStartPanel
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Toolbar\WebBrowser
ITBar7Layout = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
FileExts\.jse\OpenWithList
MRUList = "ba"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
RecentDocs\.knl
MRUListEx = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
RecentDocs\.knl
0 = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
RecentDocs\.knl
5 = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
RecentDocs\.knl
4 = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
RecentDocs\.knl
1 = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
RecentDocs\.knl
2 = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
RecentDocs\.knl
3 = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
RecentDocs\.knl
6 = "{random values}"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\PropertySystem\
PropertyHandlers\.rrls
DisableProcessIsolation = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
qafile\shell\open
CLSID = "{FBF23B40-E3F0-101B-8488-00AA003E56F8}"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
HideDesktopIcons
ClassicStartMenu = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
HideDesktopIcons\NewStartPanel
{871C5380-42A0-1069-A2EA-08002B30309D} = "1"
It modifies the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Toolbar\WebBrowser
ITBarLayout = "{random values}"
(Note: The default value data of the said registry entry is {random values}.)
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
StartPage
Favorites = "{random values}"
(Note: The default value data of the said registry entry is {random values}.)
It creates the following registry entry(ies) to disable Task Manager, Registry Tools and Folder Options:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoInternetIcon = "1"
Dropping Routine
This Trojan drops the following files:
- %Program Files%\NetMeeting\360se.knl
- %Program Files%\NetMeeting\tao.ico
- %Desktop%\Internet Expl0rer.qa
- %User Profile%\Quick Launch\LAUNCH INTERNET EXPLORER BROWSER.qa
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.. %Desktop% is the current user's desktop, which is usually C:\Windows\Profiles\{user name}\Desktop on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Desktop on Windows NT, and C:\Documents and Settings\{User Name}\Desktop 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.)
This report is generated via an automated analysis system.
SOLUTION
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
Enable Registry Editor, Task Manager, and Folder options
Step 3
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_CLASSES_ROOT
- .knl
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.jse
- OpenWithList
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\RecentDocs
- .knl
- In HKEY_CLASSES_ROOT
- .rrls
- In HKEY_CLASSES_ROOT\.rrls
- PersistentHandler
- In HKEY_CLASSES_ROOT\.rrls\ShellEx
- {000214EE-0000-0000-C000-000000000046}
- In HKEY_CLASSES_ROOT\.rrls\ShellEx
- {000214F9-0000-0000-C000-000000000046}
- In HKEY_CLASSES_ROOT\.rrls\ShellEx
- {00021500-0000-0000-C000-000000000046}
- In HKEY_CLASSES_ROOT\.rrls\ShellEx
- {CABB0DA0-DA57-11CF-9974-0020AFD79762}
- In HKEY_CLASSES_ROOT\.rrls\ShellEx
- {FBF23B80-E3F0-101B-8488-00AA003E56F8}
- In HKEY_CURRENT_USER\Software\Classes
- .rrls
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\PropertySystem\PropertyHandlers
- .rrls
- In HKEY_CLASSES_ROOT
- .qa
- In HKEY_CLASSES_ROOT
- qafile
- In HKEY_CLASSES_ROOT\qafile
- DefaultIcon
- In HKEY_CLASSES_ROOT\qafile
- CLSID
- In HKEY_CLASSES_ROOT\qafile
- shell
- In HKEY_CLASSES_ROOT\qafile\shell
- open
- In HKEY_CLASSES_ROOT\qafile\shell\open
- command
- In HKEY_CLASSES_ROOT\qafile\shellex
- IconHandler
- In HKEY_CLASSES_ROOT\qafile\shellex
- ContextMenuHandlers
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer
- HideDesktopIcons
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\HideDesktopIcons
- NewStartPanel
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\Internet Explorer\Toolbar\WebBrowser
- ITBar7Layout = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.jse\OpenWithList
- MRUList = "ba"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\RecentDocs\.knl
- MRUListEx = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\RecentDocs\.knl
- 0 = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\RecentDocs\.knl
- 5 = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\RecentDocs\.knl
- 4 = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\RecentDocs\.knl
- 1 = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\RecentDocs\.knl
- 2 = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\RecentDocs\.knl
- 3 = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\RecentDocs\.knl
- 6 = "{random values}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\PropertySystem\PropertyHandlers\.rrls
- DisableProcessIsolation = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\qafile\shell\open
- CLSID = "{FBF23B40-E3F0-101B-8488-00AA003E56F8}"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\HideDesktopIcons
- ClassicStartMenu = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\HideDesktopIcons\NewStartPanel
- {871C5380-42A0-1069-A2EA-08002B30309D} = "1"
Step 5
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\Internet Explorer\Toolbar\WebBrowser
- From: ITBarLayout = "{random values}"
To: ITBarLayout = ""{random values}""
- From: ITBarLayout = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\StartPage
- From: Favorites = "{random values}"
To: Favorites = ""{random values}""
- From: Favorites = "{random values}"
Step 6
Search and delete these files
- %Program Files%\NetMeeting\360se.knl
- %Program Files%\NetMeeting\tao.ico
- %Desktop%\Internet Expl0rer.qa
- %User Profile%\Quick Launch\LAUNCH INTERNET EXPLORER BROWSER.qa
Step 7
Scan your computer with your Trend Micro product to delete files detected as JS_OBFUS.VTG. 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 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 Temp%\nsq1.tmp
- %User Profile%\QUICK LAUNCH\Launch Internet Explorer Browser.lnk
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