WORM_ONLINEG.HHI
Worm:Win32/Taterf.B (Microsoft); Generic PWS.ak (McAfee); Infostealer.Gampass (Symantec); Trojan-Dropper.Win32.Agent.ahzm (Kaspersky); Worm.Win32.Taterf.b (v) (Sunbelt); Trojan.PWS.OnLineGames.KCNQ (FSecure)
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Worm
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
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.
TECHNICAL DETAILS
166,692 bytes
EXE
Yes
22 Jun 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.
Installation
This worm drops the following copies of itself into the affected system:
- %System%\oukdfgr.exe
(Note: %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.)
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
hjdsdse = "%System%\oukdfgr.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\{F171A450-7AF5-43E1-AFED-EDC826A1B0F5}
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\KAVsys
Other System Modifications
This worm deletes the following files:
- %System Root%\93to.bat
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
It adds the following registry keys:
HKEY_CLASSES_ROOT\IEHlprObj.IEHlprObj.1
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
IEHlprObj.IEHlprObj.1\CLSID
HKEY_CLASSES_ROOT\IEHlprObj.IEHlprObj
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
IEHlprObj.IEHlprObj\CurVer
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{F171A450-7AF5-43E1-AFED-EDC826A1B0F5}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{F171A450-7AF5-43E1-AFED-EDC826A1B0F5}\ProgID
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{F171A450-7AF5-43E1-AFED-EDC826A1B0F5}\VersionIndependentProgID
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{F171A450-7AF5-43E1-AFED-EDC826A1B0F5}\Programmable
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{F171A450-7AF5-43E1-AFED-EDC826A1B0F5}\InprocServer32
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{F171A442-7AF5-43E1-AFED-EDC826A1B0F5}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{F171A442-7AF5-43E1-AFED-EDC826A1B0F5}\1.0
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{F171A442-7AF5-43E1-AFED-EDC826A1B0F5}\1.0\
FLAGS
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{F171A442-7AF5-43E1-AFED-EDC826A1B0F5}\1.0\
0
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{F171A442-7AF5-43E1-AFED-EDC826A1B0F5}\1.0\
0\win32
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{F171A442-7AF5-43E1-AFED-EDC826A1B0F5}\1.0\
HELPDIR
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{F171A44F-7AF5-43E1-AFED-EDC826A1B0F5}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{F171A44F-7AF5-43E1-AFED-EDC826A1B0F5}\ProxyStubClsid
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{F171A44F-7AF5-43E1-AFED-EDC826A1B0F5}\ProxyStubClsid32
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{F171A44F-7AF5-43E1-AFED-EDC826A1B0F5}\TypeLib
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\KAVsys
Type = "1"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\KAVsys
ErrorControl = "1"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\KAVsys
Start = "1"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\KAVsys
ImagePath = "\??\%System%\drivers\klif.sys"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{F171A450-7AF5-43E1-AFED-EDC826A1B0F5}\InprocServer32
ThreadingModel = "Apartment"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{F171A44F-7AF5-43E1-AFED-EDC826A1B0F5}\TypeLib
Version = "1.0"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowSuperHidden = "0"
It modifies the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
Hidden = "2"
(Note: The default value data of the said registry entry is 2.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced\Folder\Hidden\
SHOWALL
CheckedValue = "0"
(Note: The default value data of the said registry entry is 1.)
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoDriveTypeAutoRun = "91"
(Note: The default value data of the said registry entry is 91.)
It deletes the following registry keys:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\
Services\KAVsys\Enum
HKEY_LOCAL_MACHINE\System\CurrentControlSet\
Services\KAVsys\Security
Dropping Routine
This worm drops the following files:
- %System%\drivers\klif.sys
- %System%\bgdferw0.dll
- %System%\hyrteas0.dll
- %System Root%\autorun.inf
- %System Root%\93to.bat
(Note: %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.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
Other Details
This worm connects to the following possibly malicious URL:
- http://{BLOCKED}s.com/hg2/ll.rar
This report is generated via an automated analysis system.
SOLUTION
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
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_LOCAL_MACHINE\System\CurrentControlSet\Services
- KAVsys
- In HKEY_CLASSES_ROOT
- IEHlprObj.IEHlprObj.1
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\IEHlprObj.IEHlprObj.1
- CLSID
- In HKEY_CLASSES_ROOT
- IEHlprObj.IEHlprObj
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\IEHlprObj.IEHlprObj
- CurVer
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
- {F171A450-7AF5-43E1-AFED-EDC826A1B0F5}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{F171A450-7AF5-43E1-AFED-EDC826A1B0F5}
- ProgID
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{F171A450-7AF5-43E1-AFED-EDC826A1B0F5}
- VersionIndependentProgID
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{F171A450-7AF5-43E1-AFED-EDC826A1B0F5}
- Programmable
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{F171A450-7AF5-43E1-AFED-EDC826A1B0F5}
- InprocServer32
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer
- Browser Helper Objects
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib
- {F171A442-7AF5-43E1-AFED-EDC826A1B0F5}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{F171A442-7AF5-43E1-AFED-EDC826A1B0F5}
- 1.0
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{F171A442-7AF5-43E1-AFED-EDC826A1B0F5}\1.0
- FLAGS
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{F171A442-7AF5-43E1-AFED-EDC826A1B0F5}\1.0
- 0
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{F171A442-7AF5-43E1-AFED-EDC826A1B0F5}\1.0\0
- win32
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{F171A442-7AF5-43E1-AFED-EDC826A1B0F5}\1.0
- HELPDIR
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
- {F171A44F-7AF5-43E1-AFED-EDC826A1B0F5}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{F171A44F-7AF5-43E1-AFED-EDC826A1B0F5}
- ProxyStubClsid
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{F171A44F-7AF5-43E1-AFED-EDC826A1B0F5}
- ProxyStubClsid32
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{F171A44F-7AF5-43E1-AFED-EDC826A1B0F5}
- TypeLib
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- hjdsdse = "%System%\oukdfgr.exe"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\KAVsys
- Type = "1"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\KAVsys
- ErrorControl = "1"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\KAVsys
- Start = "1"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\KAVsys
- ImagePath = "\??\%System%\drivers\klif.sys"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{F171A450-7AF5-43E1-AFED-EDC826A1B0F5}\InprocServer32
- ThreadingModel = "Apartment"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{F171A44F-7AF5-43E1-AFED-EDC826A1B0F5}\TypeLib
- Version = "1.0"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- ShowSuperHidden = "0"
Step 6
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\Windows\CurrentVersion\Explorer\Advanced
- From: Hidden = "2"
To: Hidden = ""2""
- From: Hidden = "2"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL
- From: CheckedValue = "0"
To: CheckedValue = ""1""
- From: CheckedValue = "0"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
- From: NoDriveTypeAutoRun = "91"
To: NoDriveTypeAutoRun = ""91""
- From: NoDriveTypeAutoRun = "91"
Step 7
Search and delete these files
- %System%\drivers\klif.sys
- %System%\bgdferw0.dll
- %System%\hyrteas0.dll
- %System Root%\autorun.inf
- %System Root%\93to.bat
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_ONLINEG.HHI. 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 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.
- %System Root%\93to.bat
Step 10
Restore these deleted registry keys/values from backup
*Note: Only Microsoft-related keys/values will be restored. If the malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.
- In HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\KAVsys
- Enum
- In HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\KAVsys
- Security
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