BKDR_ANDROM.VD
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
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.
It deletes itself after execution.
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 creates the following folders:
- %User Profile%\Application Data\TEMP
- %User Profile%\Application Data\Licenses
(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.)
Other System Modifications
This backdoor deletes the following files:
- %System Root%\cleen.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_LOCAL_MACHINE\Software\Licenses
HKEY_CLASSES_ROOT\CLSID\{0920D0C3-0920-D0C3-0920-D0C30920D0C3}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{0920D0C3-0920-D0C3-0920-D0C30920D0C3}\InprocServer32
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Licenses
{K7C0DB872A3F777C0} = "{random values}"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{0920D0C3-0920-D0C3-0920-D0C30920D0C3}\InprocServer32
ThreadingModel = "Apartment"
HKEY_LOCAL_MACHINE\SOFTWARE\Licenses
{I0920D0C3969CE83B} = "{random values}"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
RFC1156Agent\CurrentVersion\Parameters
TrapPollTimeMilliSecs = "3a98"
(Note: The default value data of the said registry entry is 3a98.)
HKEY_CURRENT_USER\Control Panel\Desktop
Wallpaper = "%User Profile%\Application Data\aura.bmp"
(Note: The default value data of the said registry entry is %Windows%\web\wallpaper\Bliss.bmp.)
HKEY_CURRENT_USER\Control Panel\Desktop
TileWallpaper = "0"
(Note: The default value data of the said registry entry is 0.)
It deletes the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{0920D0C3-0920-D0C3-0920-D0C30920D0C3}\Version
Dropping Routine
This backdoor drops the following files:
- %User Profile%\TEMP\RAIDTest
- %User Profile%\Application Data\TEMP:43FE6B9B
- %User Profile%\Licenses\00920D0C3969CE83B.Lic
- %User Profile%\Application Data\aura.bmp
- %User Startup%\aura.bmp
- cleen.bat
- %User Startup%\{malware file name}
(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.. %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.)
Other Details
This backdoor connects to the following possibly malicious URL:
- {BLOCKED}9.82.254
It deletes itself after execution.
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
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
- Licenses
- In HKEY_CLASSES_ROOT\CLSID
- {0920D0C3-0920-D0C3-0920-D0C30920D0C3}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{0920D0C3-0920-D0C3-0920-D0C30920D0C3}
- InprocServer32
Step 3
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\Licenses
- {K7C0DB872A3F777C0} = "{random values}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{0920D0C3-0920-D0C3-0920-D0C30920D0C3}\InprocServer32
- ThreadingModel = "Apartment"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Licenses
- {I0920D0C3969CE83B} = "{random values}"
Step 4
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_LOCAL_MACHINE\SOFTWARE\Microsoft\RFC1156Agent\CurrentVersion\Parameters
- From: TrapPollTimeMilliSecs = "3a98"
To: TrapPollTimeMilliSecs = ""3a98""
- From: TrapPollTimeMilliSecs = "3a98"
- In HKEY_CURRENT_USER\Control Panel\Desktop
- From: Wallpaper = "%User Profile%\Application Data\aura.bmp"
To: Wallpaper = ""%Windows%\web\wallpaper\Bliss.bmp""
- From: Wallpaper = "%User Profile%\Application Data\aura.bmp"
- In HKEY_CURRENT_USER\Control Panel\Desktop
- From: TileWallpaper = "0"
To: TileWallpaper = ""0""
- From: TileWallpaper = "0"
Step 5
Search and delete these components
- %User Profile%\TEMP\RAIDTest
- %User Profile%\Application Data\TEMP:43FE6B9B
- %User Profile%\Licenses\00920D0C3969CE83B.Lic
- %User Profile%\Application Data\aura.bmp
- %User Startup%\aura.bmp
- cleen.bat
- %User Startup%\{malware file name}
Step 6
Search and delete these folders
- %User Profile%\Application Data\TEMP
- %User Profile%\Application Data\Licenses
Step 7
Scan your computer with your Trend Micro product to delete files detected as BKDR_ANDROM.VD. 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 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.
- %System Root%\cleen.bat
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_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{0920D0C3-0920-D0C3-0920-D0C30920D0C3}
- Version
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