TROJ_VBCODE.AE
Trojan:Win32/Provis!rts, Trojan:Win32/Bumat!rts, Trojan:Win32/Provis!rts (Microsoft); [0000ec0c.EXE]:Generic.dx!0479F265A2BF, [00023c0c.EXE]:BackDoor-EWB (McAfee); Trojan-Dropper.Win32.VB.amma (Kaspersky); Trojan.Win32.Generic.pak!cobra (Sunbelt); Trojan horse Generic17.HWS (AVG)
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.
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.
Installation
This Trojan creates the following folders:
- %Windows%\Maxthon
(Note: %Windows% is the Windows folder, which is usually C:\Windows.)
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
smss = "%Windows%\maxthon\smss.exe"
It registers itself as a BHO to ensure its automatic execution every time Internet Explorer is used by adding the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{CE6F4304-993F-4AA1-B56E-8F2B112B5E8A}
Other System Modifications
This Trojan modifies the following file(s):
- %Start Menu%\Programs\Internet Explorer.lnk
(Note: %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu on Windows Vista and 7.)
It adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
HideDesktopIcons\NewStartPanel
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
HideDesktopIcons\ClassicStartMenu
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Desktop\NameSpace\{871C5380-42A0-1069-A2EA-08002B30309A}
HKEY_CLASSES_ROOT\CLSID\{871C5380-42A0-1069-A2EA-08002B30309A}
HKEY_CLASSES_ROOT\CLSID\{871C5380-42A0-1069-A2EA-08002B30309A}\
DefaultIcon
HKEY_CLASSES_ROOT\CLSID\{871C5380-42A0-1069-A2EA-08002B30309A}\
InProcServer32
HKEY_CLASSES_ROOT\CLSID\{871C5380-42A0-1069-A2EA-08002B30309A}\
Shell
HKEY_CLASSES_ROOT\CLSID\{871C5380-42A0-1069-A2EA-08002B30309A}\
Shell\OpenHomePage
HKEY_CLASSES_ROOT\CLSID\{871C5380-42A0-1069-A2EA-08002B30309A}\
Shell\OpenHomePage\Command
HKEY_CLASSES_ROOT\CLSID\{871C5380-42A0-1069-A2EA-08002B30309A}\
Shell\Q
HKEY_CLASSES_ROOT\CLSID\{871C5380-42A0-1069-A2EA-08002B30309A}\
Shell\Q\Command
HKEY_CLASSES_ROOT\CLSID\{871C5380-42A0-1069-A2EA-08002B30309A}\
Shell\??(&R)
HKEY_CLASSES_ROOT\CLSID\{871C5380-42A0-1069-A2EA-08002B30309A}\
Shell\??(&R)\Command
HKEY_CLASSES_ROOT\CLSID\{871C5380-42A0-1069-A2EA-08002B30309A}\
ShellFolder
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{194D2970-A9B4-4C9C-8BC3-E2D710BAB284}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{194D2970-A9B4-4C9C-8BC3-E2D710BAB284}\1.0
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{194D2970-A9B4-4C9C-8BC3-E2D710BAB284}\1.0\
FLAGS
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{194D2970-A9B4-4C9C-8BC3-E2D710BAB284}\1.0\
0
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{194D2970-A9B4-4C9C-8BC3-E2D710BAB284}\1.0\
0\win32
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{194D2970-A9B4-4C9C-8BC3-E2D710BAB284}\1.0\
HELPDIR
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{6C754782-968E-4118-863B-0A057D3CF097}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{6C754782-968E-4118-863B-0A057D3CF097}\ProxyStubClsid
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{6C754782-968E-4118-863B-0A057D3CF097}\ProxyStubClsid32
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{6C754782-968E-4118-863B-0A057D3CF097}\TypeLib
HKEY_CLASSES_ROOT\CLSID\{CE6F4304-993F-4AA1-B56E-8F2B112B5E8A}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{CE6F4304-993F-4AA1-B56E-8F2B112B5E8A}\InprocServer32
HKEY_CLASSES_ROOT\XunLeiAdBlocker.XunLeiBlock
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
HideDesktopIcons\NewStartPanel
{871C5380-42A0-1069-A2EA-08002B30309D} = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
HideDesktopIcons\ClassicStartMenu
{871C5380-42A0-1069-A2EA-08002B30309D} = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{871C5380-42A0-1069-A2EA-08002B30309A}\ShellFolder
Attributes = "{random values}"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{6C754782-968E-4118-863B-0A057D3CF097}\TypeLib
Version = "1.0"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{CE6F4304-993F-4AA1-B56E-8F2B112B5E8A}
ProgID = "XunLeiAdBlocker.XunLeiBlock"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{CE6F4304-993F-4AA1-B56E-8F2B112B5E8A}\InprocServer32
ThreadingModel = "Apartment"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{CE6F4304-993F-4AA1-B56E-8F2B112B5E8A}
TypeLib = "{194D2970-A9B4-4C9C-8BC3-E2D710BAB284}"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{CE6F4304-993F-4AA1-B56E-8F2B112B5E8A}
VERSION = "1.0"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
XunLeiAdBlocker.XunLeiBlock
Clsid = "{CE6F4304-993F-4AA1-B56E-8F2B112B5E8A}"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{6C754782-968E-4118-863B-0A057D3CF097}
ProxyStubClsid = "{00020424-0000-0000-C000-000000000046}"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{6C754782-968E-4118-863B-0A057D3CF097}
ProxyStubClsid32 = "{00020424-0000-0000-C000-000000000046}"
Dropping Routine
This Trojan drops the following files:
- %Windows%\StrongIndex.reg
- %System%\reg.reg
- %Favorites%\?????????-?Q?-????????.url
- %Favorites%\????-?????.url
- %Favorites%\??? - ?!???.url
- %Favorites%\???? - ?????.url
- %Favorites%\????.url
- %Favorites%\????-?????????,?????!.url
- %Desktop%\????.lnk
- %Windows%\????.lnk
- %Windows%\updateLnk.vbe
- %User Startup%\open.vbe
- %System%\del.bat
- %User Profile%\Quick Launch\Launch Internet Explorer Browser.lnk
- %Start Menu%\Windows Catalog.lnk
- %Desktop%\Internet Explorer.lnk
- %User Profile%\Quick Launch\Internet Explorer.lnk
- %Program Files%\Internet Explorer\iexlore.exe
- %Program Files%\Maxthon2\imaxthon.exe
- %Program Files%\360\360se3\360s.exe
- %Windows%\google.exe
(Note: %Windows% is the Windows folder, which is usually C:\Windows.. %System% is the Windows system folder, which is usually C:\Windows\System32.. %Favorites% is the current user's Favorites folder, which is usually C:\Documents and Settings\{user name}\Favorites on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\Favorites on Windows Vista and 7.. %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\Desktop on Windows Vista and 7.. %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.. %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.. %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu on Windows Vista and 7.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)
This report is generated via an automated analysis system.
SOLUTION
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
Restart in Safe Mode
Step 3
Close all opened browser windows
Step 4
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\HideDesktopIcons
- NewStartPanel
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\HideDesktopIcons
- ClassicStartMenu
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Desktop\NameSpace
- {871C5380-42A0-1069-A2EA-08002B30309A}
- In HKEY_CLASSES_ROOT\CLSID
- {871C5380-42A0-1069-A2EA-08002B30309A}
- In HKEY_CLASSES_ROOT\CLSID\{871C5380-42A0-1069-A2EA-08002B30309A}
- DefaultIcon
- In HKEY_CLASSES_ROOT\CLSID\{871C5380-42A0-1069-A2EA-08002B30309A}
- InProcServer32
- In HKEY_CLASSES_ROOT\CLSID\{871C5380-42A0-1069-A2EA-08002B30309A}
- Shell
- In HKEY_CLASSES_ROOT\CLSID\{871C5380-42A0-1069-A2EA-08002B30309A}\Shell
- OpenHomePage
- In HKEY_CLASSES_ROOT\CLSID\{871C5380-42A0-1069-A2EA-08002B30309A}\Shell\OpenHomePage
- Command
- In HKEY_CLASSES_ROOT\CLSID\{871C5380-42A0-1069-A2EA-08002B30309A}\Shell
- Q
- In HKEY_CLASSES_ROOT\CLSID\{871C5380-42A0-1069-A2EA-08002B30309A}\Shell\Q
- Command
- In HKEY_CLASSES_ROOT\CLSID\{871C5380-42A0-1069-A2EA-08002B30309A}\Shell
- ??(&R)
- In HKEY_CLASSES_ROOT\CLSID\{871C5380-42A0-1069-A2EA-08002B30309A}\Shell\??(&R)
- Command
- In HKEY_CLASSES_ROOT\CLSID\{871C5380-42A0-1069-A2EA-08002B30309A}
- ShellFolder
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib
- {194D2970-A9B4-4C9C-8BC3-E2D710BAB284}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{194D2970-A9B4-4C9C-8BC3-E2D710BAB284}
- 1.0
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{194D2970-A9B4-4C9C-8BC3-E2D710BAB284}\1.0
- FLAGS
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{194D2970-A9B4-4C9C-8BC3-E2D710BAB284}\1.0
- 0
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{194D2970-A9B4-4C9C-8BC3-E2D710BAB284}\1.0\0
- win32
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{194D2970-A9B4-4C9C-8BC3-E2D710BAB284}\1.0
- HELPDIR
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
- {6C754782-968E-4118-863B-0A057D3CF097}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{6C754782-968E-4118-863B-0A057D3CF097}
- ProxyStubClsid
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{6C754782-968E-4118-863B-0A057D3CF097}
- ProxyStubClsid32
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{6C754782-968E-4118-863B-0A057D3CF097}
- TypeLib
- In HKEY_CLASSES_ROOT\CLSID
- {CE6F4304-993F-4AA1-B56E-8F2B112B5E8A}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{CE6F4304-993F-4AA1-B56E-8F2B112B5E8A}
- InprocServer32
- In HKEY_CLASSES_ROOT
- XunLeiAdBlocker.XunLeiBlock
Step 5
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\Run
- smss = "%Windows%\maxthon\smss.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\HideDesktopIcons\NewStartPanel
- {871C5380-42A0-1069-A2EA-08002B30309D} = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\HideDesktopIcons\ClassicStartMenu
- {871C5380-42A0-1069-A2EA-08002B30309D} = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{871C5380-42A0-1069-A2EA-08002B30309A}\ShellFolder
- Attributes = "{random values}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{6C754782-968E-4118-863B-0A057D3CF097}\TypeLib
- Version = "1.0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{CE6F4304-993F-4AA1-B56E-8F2B112B5E8A}
- ProgID = "XunLeiAdBlocker.XunLeiBlock"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{CE6F4304-993F-4AA1-B56E-8F2B112B5E8A}\InprocServer32
- ThreadingModel = "Apartment"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{CE6F4304-993F-4AA1-B56E-8F2B112B5E8A}
- TypeLib = "{194D2970-A9B4-4C9C-8BC3-E2D710BAB284}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{CE6F4304-993F-4AA1-B56E-8F2B112B5E8A}
- VERSION = "1.0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\XunLeiAdBlocker.XunLeiBlock
- Clsid = "{CE6F4304-993F-4AA1-B56E-8F2B112B5E8A}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{6C754782-968E-4118-863B-0A057D3CF097}
- ProxyStubClsid = "{00020424-0000-0000-C000-000000000046}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{6C754782-968E-4118-863B-0A057D3CF097}
- ProxyStubClsid32 = "{00020424-0000-0000-C000-000000000046}"
Step 6
Search and delete these components
- %Windows%\StrongIndex.reg
- %System%\reg.reg
- %Favorites%\?????????-?Q?-????????.url
- %Favorites%\????-?????.url
- %Favorites%\??? - ?!???.url
- %Favorites%\???? - ?????.url
- %Favorites%\????.url
- %Favorites%\????-?????????,?????!.url
- %Desktop%\????.lnk
- %Windows%\????.lnk
- %Windows%\updateLnk.vbe
- %User Startup%\open.vbe
- %System%\del.bat
- %User Profile%\Quick Launch\Launch Internet Explorer Browser.lnk
- %Start Menu%\Windows Catalog.lnk
- %Desktop%\Internet Explorer.lnk
- %User Profile%\Quick Launch\Internet Explorer.lnk
- %Program Files%\Internet Explorer\iexlore.exe
- %Program Files%\Maxthon2\imaxthon.exe
- %Program Files%\360\360se3\360s.exe
- %Windows%\google.exe
Step 7
Search and delete this folder
- %Windows%\Maxthon
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_VBCODE.AE. 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 9
Restore deleted/modified files and/or registry entries from backup
*Note: Only Microsoft-related files/keys/values will be restored. If this malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.
- %Start Menu%\Programs\Internet Explorer.lnk
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