BKDR_BLADABIN.QL
Trojan.MSIL.Disfa.bdum (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt)
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Backdoor
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This backdoor 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
Arrival Details
This backdoor 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 backdoor drops the following copies of itself into the affected system:
- %User Profile%\Volume.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 backdoor adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
7a628cda9d1c3f0e85c34e93e172394d = "%User Profile%\Volume.exe .."
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
7a628cda9d1c3f0e85c34e93e172394d = "%User Profile%\Volume.exe .."
Other System Modifications
This backdoor modifies the following file(s):
- %User Profile%\Application Data\Microsoft
(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 deletes the following files:
- %User Profile%\MachineKeys\ac4a8043b5a7e6efcb80c0fc7b26b19c_6abce574-4afc-42c5-8ab9-5739a84d8a8b
- %User Profile%\S-1-5-21-1645522239-1292428093-682003330-1003\78ba03afadf4fc10e2f500830ac2cf47_6abce574-4afc-42c5-8ab9-5739a84d8a8b
- %User Profile%\S-1-5-21-1645522239-1292428093-682003330-1003\e507d84546983e79c7be1ae0d7d95617_6abce574-4afc-42c5-8ab9-5739a84d8a8b
- %Windows%\Microsoft.NET\Framework\v2.0.50727\config\security.config.cch.1980.117984
- %Windows%\Microsoft.NET\Framework\v2.0.50727\config\enterprisesec.config.cch.1980.117984
- %User Profile%\v2.0.50727.42\security.config.cch.1980.118125
(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.. %Windows% is the Windows folder, which is usually C:\Windows.)
It adds the following registry keys:
HKEY_CURRENT_USER\Software\7a628cda9d1c3f0e85c34e93e172394d
It adds the following registry entries:
HKEY_CURRENT_USER\Software\7a628cda9d1c3f0e85c34e93e172394d
US = "!"
HKEY_CURRENT_USER\Environment
SEE_MASK_NOZONECHECKS = "1"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%User Profile%\Volume.exe = "%User Profile%\Volume.exe:*:Enabled:Volume.exe"
Dropping Routine
This backdoor drops the following files:
- %User Profile%\Microsoft\Crypto
- %User Profile%\Crypto\RSA
- %User Profile%\RSA\S-1-5-21-1645522239-1292428093-682003330-1003
- %User Profile%\RSA\MachineKeys
- %System Root%\.tmp
- %User Startup%\7a628cda9d1c3f0e85c34e93e172394d.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.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.)
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
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
- 7a628cda9d1c3f0e85c34e93e172394d
Step 4
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
- 7a628cda9d1c3f0e85c34e93e172394d = "%User Profile%\Volume.exe .."
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- 7a628cda9d1c3f0e85c34e93e172394d = "%User Profile%\Volume.exe .."
- In HKEY_CURRENT_USER\Software\7a628cda9d1c3f0e85c34e93e172394d
- US = "!"
- In HKEY_CURRENT_USER\Environment
- SEE_MASK_NOZONECHECKS = "1"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
- %User Profile%\Volume.exe = "%User Profile%\Volume.exe:*:Enabled:Volume.exe"
Step 5
Search and delete these components
- %User Profile%\Microsoft\Crypto
- %User Profile%\Crypto\RSA
- %User Profile%\RSA\S-1-5-21-1645522239-1292428093-682003330-1003
- %User Profile%\RSA\MachineKeys
- %System Root%\.tmp
- %User Startup%\7a628cda9d1c3f0e85c34e93e172394d.exe
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_BLADABIN.QL. 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 deleted/modified files and/or registry entries from backup
*Note: Only Microsoft-related files/keys/values will be restored. If this malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.
- %User Profile%\Application Data\Microsoft
Step 8
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%\MachineKeys\ac4a8043b5a7e6efcb80c0fc7b26b19c_6abce574-4afc-42c5-8ab9-5739a84d8a8b
- %User Profile%\S-1-5-21-1645522239-1292428093-682003330-1003\78ba03afadf4fc10e2f500830ac2cf47_6abce574-4afc-42c5-8ab9-5739a84d8a8b
- %User Profile%\S-1-5-21-1645522239-1292428093-682003330-1003\e507d84546983e79c7be1ae0d7d95617_6abce574-4afc-42c5-8ab9-5739a84d8a8b
- %Windows%\Microsoft.NET\Framework\v2.0.50727\config\security.config.cch.1980.117984
- %Windows%\Microsoft.NET\Framework\v2.0.50727\config\enterprisesec.config.cch.1980.117984
- %User Profile%\v2.0.50727.42\security.config.cch.1980.118125
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