BKDR_FAKETM.AD
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Backdoor
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This backdoor arrives as an attachment to email messages spammed by other malware/grayware or malicious users.
It does not have any propagation routine.
It executes commands from a remote malicious user, effectively compromising the affected system.
It does not have any downloading capability.
TECHNICAL DETAILS
Arrival Details
This backdoor arrives as an attachment to email messages spammed by other malware/grayware or malicious users.
Installation
This backdoor adds the following mutexes to ensure that only one of its copies runs at any one time:
- kkkeke2ek
It injects codes into the following process(es):
- explorer.exe
Autostart Technique
This backdoor adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
windows VOscreen = "%System%:voscreen.exe"
Propagation
This backdoor does not have any propagation routine.
Backdoor Routine
This backdoor executes the following commands from a remote malicious user:
- Remote code execution
- Capture screenshots
- Retrieve stored passwords
- View webcam activity
- Send system information (IP address, computer name, user name, operating system)
- Displays Messagebox
It connects to the following URL(s) to send and receive commands from a remote malicious user:
- {BLOCKED}rosooo.{BLOCKED}0.org
Download Routine
This backdoor does not have any downloading capability.
NOTES:
It drops a copy of itself to an alternate data stream (ADS) and saves it as %System%:voscreen.exe.
(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)
It queries the default web browser by accessing the following registry entry:
HKEY_CLASSES_ROOT\http\shell\open\command
It then launches a hidden web browser process. (e.g. iexplore.exe) The malware then injects its code in the said process which contains its backdoor routines.
It does not have rootkit capabilities.
It does not exploit any vulnerability.
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
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
- windows VOscreen = "%System%:voscreen.exe"
- windows VOscreen = "%System%:voscreen.exe"
Step 4
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_FAKETM.AD. 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.
NOTES:
Before proceeding to Step 4, Remove added Alternate Data Streams:
- Download Streams.exe.
- Extract the contents of this file to a location of your choice.
- Open a command prompt window. Click Start > Run.
・On Windows 98 and ME, type COMMAND, then press Enter.
・On Windows NT, 2000, XP, and Server 2003, type CMD, then press Enter.
- In the command prompt, type the following, then press Enter: CD {Path where contents of downloaded file was extracted}
- Still in the command prompt type the following then press Enter: Streams.exe -d %System%
- Type exit then press enter.
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