WORM_REBHIP.EOA
VirTool:Win32/Injector.gen!BH (Microsoft); Generic BackDoor.aew (McAfee); Trojan.Gen (Symantec); Trojan.Win32.Buzus.hjhu (Kaspersky); Trojan.Win32.Buzus (Sunbelt); Trojan horse Generic21.CLGV (AVG)
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.
It disables Task Manager, Registry Editor, and Folder Options.
TECHNICAL DETAILS
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:
- %User Profile%\Application Data\windows32.exe
(Note: %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.)
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
MicrosoftWindows = "%User Profile%\Application Data\windows32.exe"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\RunOnce
MicrosoftWindows = "%User Profile%\Application Data\windows32.exe"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\RunServices
MicrosoftWindows = "%User Profile%\Application Data\windows32.exe"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\RunServicesOnce
MicrosoftWindows = "%User Profile%\Application Data\windows32.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
MicrosoftWindows = "%User Profile%\Application Data\windows32.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\RunOnce
MicrosoftWindows = "%User Profile%\Application Data\windows32.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\RunServices
MicrosoftWindows = "%User Profile%\Application Data\windows32.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\RunServicesOnce
MicrosoftWindows = "%User Profile%\Application Data\windows32.exe"
Other System Modifications
This worm deletes the following files:
- %User Profile%\Application Data\windows32.exe
(Note: %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.)
It adds the following registry keys:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Windows\CurrentVersion\RunOnce
HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Windows\CurrentVersion\RunServices
HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Windows\CurrentVersion\RunServicesOnce
HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\Run
HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Windows\
load
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\RunServices
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\RunServicesOnce
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\Run
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Windows\
load
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Windows\
load
MicrosoftWindows = "%User Profile%\Application Data\windows32.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
MicrosoftWindows = "%User Profile%\Application Data\windows32.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Windows\
load
MicrosoftWindows = "%User Profile%\Application Data\windows32.exe"
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\Run
MicrosoftWindows = "%User Profile%\Application Data\windows32.exe"
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
Enable Registry Editor, Task Manager, and Folder options
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
- RunOnce
- In HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion
- RunServices
- In HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion
- RunServicesOnce
- In HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer
- Run
- In HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows
- load
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion
- RunServices
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion
- RunServicesOnce
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer
- Run
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows
- load
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
- MicrosoftWindows = "%User Profile%\Application Data\windows32.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce
- MicrosoftWindows = "%User Profile%\Application Data\windows32.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunServices
- MicrosoftWindows = "%User Profile%\Application Data\windows32.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunServicesOnce
- MicrosoftWindows = "%User Profile%\Application Data\windows32.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- MicrosoftWindows = "%User Profile%\Application Data\windows32.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce
- MicrosoftWindows = "%User Profile%\Application Data\windows32.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
- MicrosoftWindows = "%User Profile%\Application Data\windows32.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServicesOnce
- MicrosoftWindows = "%User Profile%\Application Data\windows32.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows\load
- MicrosoftWindows = "%User Profile%\Application Data\windows32.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run
- MicrosoftWindows = "%User Profile%\Application Data\windows32.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows\load
- MicrosoftWindows = "%User Profile%\Application Data\windows32.exe"
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_REBHIP.EOA. 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%\Application Data\windows32.exe
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