BKDR_NETBOT.BHHH
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
![](/vinfo/imgFiles/legend.jpg)
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 may be dropped by other malware.
It does not have any propagation routine.
It executes commands from a remote malicious user, effectively compromising the affected system. It connects to a website to send and receive information.
It does not have any downloading capability.
It gathers certain information on the affected computer.
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.
It may be dropped by other malware.
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\Explorer\
Shell Folders
Startup = "%User Profile%\Start Menu\Programs\Startup"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
User Shell Folders\New
Startup = "%User Profile%\My Documents\Startup"
It enables its automatic execution at every system startup by dropping the following copies of itself into the Windows Common Startup folder:
- %User Profile%\My Documents\Startup\algsrv.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.)
Propagation
This backdoor does not have any propagation routine.
Backdoor Routine
This backdoor executes the following commands from a remote malicious user:
- Perform remote shell
- Monitor mouse and keyboard events
- Uninstall itself
- Inject itself to specific process
- Terminate process
- Capture screenshot
- Get drive information
- File Manipulation (Create, Modify, Rename, Copy, Delete)
- Execute file
It connects to the following websites to send and receive information:
- {BLOCKED}.90.11:443
Download Routine
This backdoor does not have any downloading capability.
Information Theft
This backdoor gathers the following information on the affected computer:
- Computer Name
- OS Version
- RAM
NOTES:
This backdoor pings the following URL to get its IP address where it connects to send and receive information from malicious user:
- yd.{BLOCKED}bto.org:443
It does not have rootkit capabilities.
It does not exploit any vulnerability.
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 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\Explorer\Shell Folders
- Startup = "%User Profile%\Start Menu\Programs\Startup"
- Startup = "%User Profile%\Start Menu\Programs\Startup"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders\New
- Startup = "%User Profile%\My Documents\Startup"
- Startup = "%User Profile%\My Documents\Startup"
Step 4
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_NETBOT.BHHH. 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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