TROJ_DLOAD.YU
Windows 98, ME, NT, 2000, XP, Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Trojan adds registry entries to enable its automatic execution at every system startup.
TECHNICAL DETAILS
501248 bytes
Yes
05 Jan 2010
Installation
This Trojan drops the following file(s)/component(s):
- %Program Files%\ANTIVIIRUS.EXE
- %Program Files%\bho.exe
- %Program Files%\tmp0.exe
- %Program Files%\tmp1.exe
- %Program Files%\tmp2.exe
- %System%\778670\778670.dll
- %Windows%\RESOURCES\SERVICERAM.DLL
- C:\42356d3.bat
- C:\z3g45.bat
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.. %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.. %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
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
antiviirus = "%Program Files%\antiviirus.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\
Windows\CURRENTVERSION\Run
DelayLoad = "{malware path and filename}"
It registers 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\ {1B12F639-CBA9-45DD-89FE-9FA7D4340716}
(default) =
Other System Modifications
This Trojan adds the following registry keys:
HKEY_CLASSES_ROOT\CLSID\ {11192f33-32f2-47c2-97e0-7545830085d6}\
InprocServer32
(Default) = "%Windows%\Resources\ServiceRam.dll"
HKEY_CLASSES_ROOT\CLSID\ {1B12F639-CBA9-45DD-89FE-9FA7D4340716}
(Default) = "778670 Class"
HKEY_CLASSES_ROOT\CLSID\ {1B12F639-CBA9-45DD-89FE-9FA7D4340716}\
InprocServer32
(Default) = "%System%\778670\778670.dll"
HKEY_CLASSES_ROOT\CLSID\ {1B12F639-CBA9-45DD-89FE-9FA7D4340716}\
InprocServer32
ThreadingModel = "Apartment"
HKEY_CLASSES_ROOT\CLSID\ {1B12F639-CBA9-45DD-89FE-9FA7D4340716}\
ProgID
(Default) = "f406.f406mgr.1"
HKEY_CLASSES_ROOT\CLSID\ {1B12F639-CBA9-45DD-89FE-9FA7D4340716}\
TypeLib
(Default) = "{E63648F7-3933-440E-AAAA-A8584DD7B7EB}"
HKEY_CLASSES_ROOT\CLSID\ {1B12F639-CBA9-45DD-89FE-9FA7D4340716}\
VersionIndependentProgID
(Default) = "f406.f406mgr"
HKEY_CLASSES_ROOT\f406.f406mgr
(Default) = "778670 Class"
HKEY_CLASSES_ROOT\f406.f406mgr.1
(default) = "778670 Class"
HKEY_CLASSES_ROOT\f406.f406mgr.1\CLSID
(default) = "{1B12F639-CBA9-45DD-89FE-9FA7D4340716}"
HKEY_CLASSES_ROOT\f406.f406mgr\CLSID
(default) = "{1B12F639-CBA9-45DD-89FE-9FA7D4340716}"
HKEY_CLASSES_ROOT\f406.f406mgr\CurVer
(default) = "f406.f406mgr.1"
HKEY_CLASSES_ROOT\Interface\ {F7D09218-46D7-4D3D-9B7F-315204CD0836}
(default) = "Ie405mgr"
HKEY_CLASSES_ROOT\Interface\ {F7D09218-46D7-4D3D-9B7F-315204CD0836}\
ProxyStubClsid
(default) = "{00020424-0000-0000-C000-000000000046}"
HKEY_CLASSES_ROOT\Interface\ {F7D09218-46D7-4D3D-9B7F-315204CD0836}\
ProxyStubClsid32
(default) = "{00020424-0000-0000-C000-000000000046}"
HKEY_CLASSES_ROOT\Interface\ {F7D09218-46D7-4D3D-9B7F-315204CD0836}\
TypeLib
(default) = "{E63648F7-3933-440E-B4F6-A8584DD7B7EB}"
HKEY_CLASSES_ROOT\Interface\ {F7D09218-46D7-4D3D-9B7F-315204CD0836}\
TypeLib
(default) = "1.0"
HKEY_CLASSES_ROOT\TypeLib\ {E63648F7-3933-440E-B4F6-A8584DD7B7EB}\
1.0
(default) = "778670 1.0 Type Library"
HKEY_CLASSES_ROOT\TypeLib\ {E63648F7-3933-440E-B4F6-A8584DD7B7EB}\
1.0\0\win32
(default) = "%System%\778670\778670.dll"
HKEY_CLASSES_ROOT\TypeLib\ {E63648F7-3933-440E-B4F6-A8584DD7B7EB}\
1.0\FLAGS
(default) = "0"
HKEY_CLASSES_ROOT\TypeLib\ {E63648F7-3933-440E-B4F6-A8584DD7B7EB}\
1.0\HELPDIR
(default) = "%System%\778670\"
HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\
Windows\CURRENTVERSION
Logon = "4af13add"
HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\
Windows\CURRENTVERSION\Explorer\
Browser Helper Objects\ {1B12F639-CBA9-45DD-89FE-9FA7D4340716}
(default) = "778670 helper"
HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\
Windows\CURRENTVERSION\Explorer\
Browser Helper Objects\ {1B12F639-CBA9-45DD-89FE-9FA7D4340716}
NoExplorer = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\ShellServiceObjectDelayLoad
ServiceRam = "{11192f33-32f2-47c2-97e0-7545830085d6}"
SOLUTION
8.900
6.857.00
18 Feb 2010
Step 1
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
- antiviirus =%Program Files%\\antiviirus.exe
- antiviirus =%Program Files%\\antiviirus.exe
- In HKEY_LOCAL_MACHINE\\SOFTWARE\\MICROSOFT\\ Windows\\CURRENTVERSION\\Run
- DelayLoad ={malware path and filename}
- DelayLoad ={malware path and filename}
- In HKEY_CLASSES_ROOT\\CLSID\\ {11192f33-32f2-47c2-97e0-7545830085d6}\\ InprocServer32
- (Default)=%Windows%\\Resources\\ServiceRam.dll
- (Default)=%Windows%\\Resources\\ServiceRam.dll
- In HKEY_CLASSES_ROOT\\CLSID\\ {1B12F639-CBA9-45DD-89FE-9FA7D4340716}
- (Default) =778670 Class
- (Default) =778670 Class
- In HKEY_CLASSES_ROOT\\CLSID\\ {1B12F639-CBA9-45DD-89FE-9FA7D4340716}\\ InprocServer32
- (Default) =%System%\\778670\\778670.dll
- (Default) =%System%\\778670\\778670.dll
- In HKEY_CLASSES_ROOT\\CLSID\\ {1B12F639-CBA9-45DD-89FE-9FA7D4340716}\\ InprocServer32
- ThreadingModel =Apartment
- ThreadingModel =Apartment
- In HKEY_CLASSES_ROOT\\CLSID\\ {1B12F639-CBA9-45DD-89FE-9FA7D4340716}\\ ProgID
- (Default)= f406.f406mgr.1
- (Default)= f406.f406mgr.1
- In HKEY_CLASSES_ROOT\\CLSID\\ {1B12F639-CBA9-45DD-89FE-9FA7D4340716}\\ TypeLib
- (Default)={E63648F7-3933-440E-AAAA-A8584DD7B7EB}
- (Default)={E63648F7-3933-440E-AAAA-A8584DD7B7EB}
- In HKEY_CLASSES_ROOT\\CLSID\\ {1B12F639-CBA9-45DD-89FE-9FA7D4340716}\\ VersionIndependentProgID
- (Default) = f406.f406mgr
- (Default) = f406.f406mgr
- In HKEY_CLASSES_ROOT\\f406.f406mgr
- (Default) =778670 Class
- (Default) =778670 Class
- In HKEY_CLASSES_ROOT\\f406.f406mgr.1
- (default)=778670 Class
- (default)=778670 Class
- In HKEY_CLASSES_ROOT\\f406.f406mgr.1\\CLSID
- (default)={1B12F639-CBA9-45DD-89FE-9FA7D4340716}
- (default)={1B12F639-CBA9-45DD-89FE-9FA7D4340716}
- In HKEY_CLASSES_ROOT\\f406.f406mgr\\CLSID
- (default)={1B12F639-CBA9-45DD-89FE-9FA7D4340716}
- (default)={1B12F639-CBA9-45DD-89FE-9FA7D4340716}
- In HKEY_CLASSES_ROOT\\f406.f406mgr\\CurVer
- (default)=f406.f406mgr.1
- (default)=f406.f406mgr.1
- In HKEY_CLASSES_ROOT\\Interface\\ {F7D09218-46D7-4D3D-9B7F-315204CD0836}
- (default)=Ie405mgr
- (default)=Ie405mgr
- In HKEY_CLASSES_ROOT\\Interface\\ {F7D09218-46D7-4D3D-9B7F-315204CD0836}\\ ProxyStubClsid
- (default)={00020424-0000-0000-C000-000000000046}
- (default)={00020424-0000-0000-C000-000000000046}
- In HKEY_CLASSES_ROOT\\Interface\\ {F7D09218-46D7-4D3D-9B7F-315204CD0836}\\ ProxyStubClsid32
- (default)={00020424-0000-0000-C000-000000000046}
- (default)={00020424-0000-0000-C000-000000000046}
- In HKEY_CLASSES_ROOT\\Interface\\ {F7D09218-46D7-4D3D-9B7F-315204CD0836}\\ TypeLib
- (default)={E63648F7-3933-440E-B4F6-A8584DD7B7EB}
- (default)={E63648F7-3933-440E-B4F6-A8584DD7B7EB}
- In HKEY_CLASSES_ROOT\\Interface\\ {F7D09218-46D7-4D3D-9B7F-315204CD0836}\\ TypeLib
- (default)=1.0
- (default)=1.0
- In HKEY_CLASSES_ROOT\\TypeLib\\ {E63648F7-3933-440E-B4F6-A8584DD7B7EB}\\ 1.0
- (default)=778670 1.0 Type Library
- (default)=778670 1.0 Type Library
- In HKEY_CLASSES_ROOT\\TypeLib\\ {E63648F7-3933-440E-B4F6-A8584DD7B7EB}\\ 1.0\\0\\win32
- (default)=%System%\\778670\\778670.dll
- (default)=%System%\\778670\\778670.dll
- In HKEY_CLASSES_ROOT\\TypeLib\\ {E63648F7-3933-440E-B4F6-A8584DD7B7EB}\\ 1.0\\FLAGS
- (default)=0
- (default)=0
- In HKEY_CLASSES_ROOT\\TypeLib\\ {E63648F7-3933-440E-B4F6-A8584DD7B7EB}\\ 1.0\\HELPDIR
- (default)=%System%\\778670\\
- (default)=%System%\\778670\\
- In HKEY_LOCAL_MACHINE\\SOFTWARE\\MICROSOFT\\ Windows\\CURRENTVERSION
- Logon=4af13add
- Logon=4af13add
- In HKEY_LOCAL_MACHINE\\SOFTWARE\\MICROSOFT\\ Windows\\CURRENTVERSION\\Explorer\\ Browser Helper bjects\\{1B12F639-CBA9-45DD-89FE-9FA7D4340716}
- (default)=778670 helper
- (default)=778670 helper
- In HKEY_LOCAL_MACHINE\\SOFTWARE\\MICROSOFT\\ Windows\\CURRENTVERSION\\Explorer\\ Browser Helper Objects\\ {1B12F639-CBA9-45DD-89FE-9FA7D4340716}
- NoExplorer =1
- NoExplorer =1
- In HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\ Windows\\CurrentVersion\\ShellServiceObjectDelayLoad
- ServiceRam={11192f33-32f2-47c2-97e0-7545830085d6}
- ServiceRam={11192f33-32f2-47c2-97e0-7545830085d6}
Step 2
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. Before you could do this, you must restart in Safe Mode. For instructions on how to do this, you may refer to this page If the preceding step requires you to restart in safe mode, you may proceed to edit the system registry.
- In HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\Windows\CURRENTVERSION\Explorer\Browser Helper Objects
- {1B12F639-CBA9-45DD-89FE-9FA7D4340716}
- {1B12F639-CBA9-45DD-89FE-9FA7D4340716}
Step 3
Search and delete these files
- %Program Files%\ANTIVIIRUS.EXE
- %Program Files%\bho.exe
- %Program Files%\tmp0.exe
- %Program Files%\tmp1.exe
- %Program Files%\tmp2.exe
- %System%\778670\778670.dll
- %Windows%\RESOURCES\SERVICERAM.DLL
- C:\42356d3.bat
- C:\z3g45.bat
Step 4
Scan your computer with your Trend Micro product to delete files detected as TROJ_DLOAD.YU 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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