BKDR_VISEL.FP
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Backdoor
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
Dropped by other malware
This backdoor may be dropped by other malware.
It executes commands from a remote malicious user, effectively compromising the affected system. It connects to a website to send and receive information.
TECHNICAL DETAILS
Varies
EXE, DLL
Yes
31 Aug 2012
Compromises network security, Connects to URLs/IPs, Drops files
Arrival Details
This backdoor may be dropped by the following malware:
Installation
This backdoor drops the following component file(s):
- %Program Files%\Common Files\odbc.nls - also detected as BKDR_VISEL.FP
- %User Temp%\print32.dll - also detected as BKDR_VISEL.FP
- %User Temp%\config.ini
- %User Temp%\dtapp.exe
- %Temp%\udpmon.txt
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.. %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.. %Temp% is the Windows Temporary folder, which is usually C:\Windows\Temp or C:\WINNT\Temp.)
Its DLL component is injected to the following process(es):
- spoolsv.exe
Other System Modifications
This backdoor deletes the following files:
- %Program Files%\CommonFiles\System\sql_div.nls
- %Program Files%\CommonFiles\System\sql_dmc.nls
- %Program Files%\CommonFiles\System\sql_dua.nls
- %Program Files%\CommonFiles\System\sql_ger.nls
- %Program Files%\CommonFiles\System\sql_gpj.nls
- %Program Files%\CommonFiles\System\sql_lif.nls
- %Program Files%\CommonFiles\System\sql_orp.nls
- %Program Files%\CommonFiles\System\sql_rcs.nls
- %Program Files%\CommonFiles\System\sql_rehto.nls
- %Program Files%\CommonFiles\System\sql_res.nls
- %Program Files%\CommonFiles\System\sql_txe.nls
- %Program Files%\CommonFiles\System\sql_yek.nls
- %Program Files%\CommonFiles\System\dumpsql.exe
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Spooler
FailureActions = "{hex values}"
(Note: The default value data of the said registry entry is {Default values}.)
Backdoor Routine
This backdoor executes the following commands from a remote malicious user:
- Change the port it uses when connecting to its C&C server
- Check contents of %Program Files%\Common Files folder
- Connect to a new C&C IP address
- Connect to a website via HTTP
- Create/Manipulate threads
- Download and execute files
- List files and folders
- Load/free libraries
- Log user keystrokes
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)
It connects to the following websites to send and receive information:
- https://{BLOCKED}pdate.{BLOCKED}vm.com
It posts the following information to its command and control (C&C) server:
- Computer name
- Drive information
- Network information
- OS information
- User name
Process Termination
This backdoor terminates the following services if found on the affected system:
- Norton 360
- Norton Antivirus
- Norton Internet Security
- \"Windows Update\"
- spooler
- stisvc
SOLUTION
9.200
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 3
Restart in Safe Mode
Step 4
Restore this modified 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\SYSTEM\CurrentControlSet\Services\Spooler
- From: FailureActions = "{hex values}"
To: FailureActions = {Default values}
- From: FailureActions = "{hex values}"
Step 5
Search and delete these files
- %User Temp%\config.ini
- %User Temp%\dtapp.exe
- %Temp%\udpmon.txt
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_VISEL.FP. 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 these deleted files from backup
*Note: Only Microsoft-related 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.
- %Program Files%\CommonFiles\System\sql_div.nls
- %Program Files%\CommonFiles\System\sql_dmc.nls
- %Program Files%\CommonFiles\System\sql_dua.nls
- %Program Files%\CommonFiles\System\sql_ger.nls
- %Program Files%\CommonFiles\System\sql_gpj.nls
- %Program Files%\CommonFiles\System\sql_lif.nls
- %Program Files%\CommonFiles\System\sql_orp.nls
- %Program Files%\CommonFiles\System\sql_rcs.nls
- %Program Files%\CommonFiles\System\sql_rehto.nls
- %Program Files%\CommonFiles\System\sql_res.nls
- %Program Files%\CommonFiles\System\sql_txe.nls
- %Program Files%\CommonFiles\System\sql_yek.nls
- %Program Files%\CommonFiles\System\dumpsql.exe
Did this description help? Tell us how we did.