TROJ_BIFROSE.USB09VC
Worm:Win32/Rebhip.A (Microsoft); Generic Backdoor.xo (McAfee); Trojan.Gen (Symantec); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Generic.7204077 (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.
It deletes itself after execution.
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 drops the following copies of itself into the affected system:
- %System Root%\Java\Java\server.exe
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
It creates the following folders:
- %System Root%\Java
- %System Root%\Java\Java
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
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
Java = "%System Root%\Java\Java\server.exe"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Java Inc = "%System Root%\Java\Java\server.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{H36QWWI5-0Y4A-8WBW-403F-77WD0B0LFGDF}
StubPath = "%System Root%\Java\Java\server.exe Restart"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{H36QWWI5-0Y4A-8WBW-403F-77WD0B0LFGDF}
StubPath = "%System Root%\Java\Java\server.exe"
Other System Modifications
This Trojan adds the following registry keys:
HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\Run
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\Run
HKEY_LOCAL_MACHINE\Software\Microsoft\
Active Setup\Installed Components\{H36QWWI5-0Y4A-8WBW-403F-77WD0B0LFGDF}
HKEY_CURRENT_USER\SOFTWARE\remote
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
Policies = "%System Root%\Java\Java\server.exe"
HKEY_CURRENT_USER\Software\remote
FirstExecution = "10/02/2012 -- 19:23"
HKEY_CURRENT_USER\Software\remote
NewIdentification = "remote"
HKEY_CURRENT_USER\Software\remote
NewGroup = [REG_EXPAND_SZ, value: ]
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
Policies = "%System Root%\Java\Java\server.exe"
It deletes the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Active Setup\Installed Components\{H36QWWI5-0Y4A-8WBW-403F-77WD0B0LFGDF}
Dropping Routine
This Trojan drops the following files:
- %User Temp%\Wilbert2.txt
- %User Profile%\Application Data\Wilbertv1.18.0 - Trial versionlog.dat
- %User Temp%\Wilbert7
- %User Temp%\Wilbert8
(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.)
Other Details
This Trojan deletes itself after execution.
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
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_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
- Run
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
- Run
- In HKEY_LOCAL_MACHINE\Software\Microsoft\Active Setup\Installed Components
- {H36QWWI5-0Y4A-8WBW-403F-77WD0B0LFGDF}
- In HKEY_CURRENT_USER\SOFTWARE
- remote
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
- Java = "%System Root%\Java\Java\server.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- Java Inc = "%System Root%\Java\Java\server.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{H36QWWI5-0Y4A-8WBW-403F-77WD0B0LFGDF}
- StubPath = "%System Root%\Java\Java\server.exe Restart"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{H36QWWI5-0Y4A-8WBW-403F-77WD0B0LFGDF}
- StubPath = "%System Root%\Java\Java\server.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run
- Policies = "%System Root%\Java\Java\server.exe"
- In HKEY_CURRENT_USER\Software\remote
- FirstExecution = "10/02/2012 -- 19:23"
- In HKEY_CURRENT_USER\Software\remote
- NewIdentification = "remote"
- In HKEY_CURRENT_USER\Software\remote
- NewGroup = [REG_EXPAND_SZ, value: ]
Step 6
Search and delete these files
- %User Temp%\Wilbert2.txt
- %User Profile%\Application Data\Wilbertv1.18.0 - Trial versionlog.dat
- %User Temp%\Wilbert7
- %User Temp%\Wilbert8
Step 7
Search and delete these folders
- %System Root%\Java
- %System Root%\Java\Java
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_BIFROSE.USB09VC. 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 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_CURRENT_USER\Software\Microsoft\Active Setup\Installed Components
- {H36QWWI5-0Y4A-8WBW-403F-77WD0B0LFGDF}
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