BKDR_POISON.BNH

This backdoor arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It does not have any propagation routine.

It executes commands from a remote malicious user, effectively compromising the affected system.

It does not drop any other file.

It does not have any downloading capability.

Arrival Details

This backdoor arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

It 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 adds the following mutexes to ensure that only one of its copies runs at any one time:

• n888888h1

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
windwosseris prof = "{Malware Path}\WinMainPro.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run - for users with Admin Rights
windwosseris prof = "{Malware Path}\WinMainPro.exe"

Propagation

This backdoor does not have any propagation routine.

Backdoor Routine

This backdoor executes the following commands from a remote malicious user:

• Send system information (Lan IP, Wan IP, Computer name, Username, Account Type, OS)
• Send hardware information (CPU speed, Memory)
• Manage Files (Search, Download, Upload, Execute, Rename, Delete)
• Manage Registries (Search, Modify, Delete, Rename, Create)
• Manage Processes (View, Kill, Suspend, Unload Module)
• Manage Services (View, Start, Stop, Edit, Install, Uninstall)
• Manage Devices (View, Enable, Disable, Remove)
• Manage Windows
• Relay server
• View,copy and uninstall applications
• View active ports
• Perform a shell command
• Download and inject remote codes to legitimate processes
• Log keystrokes and active window
• Capture screenshots
• View webcam activity
• Listen to microphone audio
• Update, Uninstall, Restart the malware
• Retrieve cached passwords and hashes

It connects to the following URL(s) to send and receive commands from a remote malicious user:

• {BLOCKED}y.{BLOCKED}arleft.com:443
• hk.{BLOCKED}arleft.com:80

Dropping Routine

This backdoor does not drop any other file.

Download Routine

This backdoor does not have any downloading capability.

NOTES:

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 if the said process which contains its backdoor routines.

It does not have rootkit capabilities.

It does not exploit any vulnerability.