TROJ_BSCOPE.WF
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.
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:
- %User Profile%\Application Data\Policies
(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 Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Policies = "%User Profile%\Policies\Policies.exe"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Policies = "%User Profile%\Policies\Policies.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
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
Policies = "%User Profile%\Policies\Policies.exe"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
Policies = "%User Profile%\Policies\Policies.exe:*:Enabled:Policies"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
Policies = "%User Profile%\Policies\Policies.exe:*:Enabled:Policies"
HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Winlogon
Shell = "Explorer.exe,%User Profile%\Policies\Policies.exe"
HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Windows
run = "%User Profile%\Policies\Policies.exe"
HKEY_LOCAL_MACHINE
Policies = "%User Profile%\Policies\Policies.exe"
HKEY_LOCAL_MACHINE
Policies = "%User Profile%\Policies\Policies.exe:*:Enabled:Policies"
HKEY_CURRENT_USER\S-1-5-21-1645522239-1292428093-682003330-1003
Policies = "%User Profile%\Policies\Policies.exe"
HKEY_CURRENT_USER\S-1-5-21-1645522239-1292428093-682003330-1003
Shell = "Explorer.exe,%User Profile%\Policies\Policies.exe"
It modifies the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Windows
load = "%User Profile%\Policies\Policies.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
Policies = "%User Profile%\Policies\Policies.exe"
Other Details
This Trojan connects to the following possibly malicious URL:
- http://{BLOCKED}eak.org/stunt/dll.php?dllpass=SkaAiqs
- tp://{BLOCKED}eak.org/stunt/cmdll.php?dllpass=SkaAiqs
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_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
- Run
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
- Run
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
- Policies = "%User Profile%\Policies\Policies.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- Policies = "%User Profile%\Policies\Policies.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run
- Policies = "%User Profile%\Policies\Policies.exe"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
- Policies = "%User Profile%\Policies\Policies.exe:*:Enabled:Policies"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
- Policies = "%User Profile%\Policies\Policies.exe:*:Enabled:Policies"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Winlogon
- Shell = "Explorer.exe,%User Profile%\Policies\Policies.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows
- run = "%User Profile%\Policies\Policies.exe"
- In HKEY_LOCAL_MACHINE
- Policies = "%User Profile%\Policies\Policies.exe"
- In HKEY_LOCAL_MACHINE
- Policies = "%User Profile%\Policies\Policies.exe:*:Enabled:Policies"
- In HKEY_CURRENT_USER\S-1-5-21-1645522239-1292428093-682003330-1003
- Policies = "%User Profile%\Policies\Policies.exe"
- In HKEY_CURRENT_USER\S-1-5-21-1645522239-1292428093-682003330-1003
- Shell = "Explorer.exe,%User Profile%\Policies\Policies.exe"
Step 6
Restore these modified registry values
Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows
- load = "%User Profile%\Policies\Policies.exe"
Step 7
Search and delete this folder
- %User Profile%\Application Data\Policies
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_BSCOPE.WF. 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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