BKDR_POISON.BNH
W32/Rimecud.Y2.gen!Eldorado (generic, not disinfectable) (Fprot), TR/Crypt.XPACK.Gen3 (Antivir)
Windows 2000, Windows XP, Windows Server 2003, Windows Vista, Windows 7
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Backdoor
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware, Spammed via email
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.
TECHNICAL DETAILS
53,248 bytes
EXE
Yes
02 Nov 2012
Compromises system security, Connects to URLs/IPs
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.
SOLUTION
9.300
9.502.04
02 Nov 2012
9.505.00
04 Nov 2012
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
- windwosseris prof = "{Malware Path}\WinMainPro.exe"
- windwosseris prof = "{Malware Path}\WinMainPro.exe"
- In HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- windwosseris prof = "{Malware Path}\WinMainPro.exe"
- windwosseris prof = "{Malware Path}\WinMainPro.exe"
Step 4
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_POISON.BNH. 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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