BKDR_POISON.BGZ
Backdoor.Darkmoon (Symantec), BackDoor-AMQ.dr (McAfee)
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Backdoor
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Dropped by other malware, Downloaded from the Internet
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 does not have any propagation routine.
It opens a hidden Internet Explorer window. However, as of this writing, the said sites are inaccessible.
It does not drop any other file.
It does not have any downloading capability.
It deletes the initially executed copy of itself.
TECHNICAL DETAILS
Port 80
45,056 bytes
EXE
Yes
09 Oct 2011
Compromises system security, Connects to URLs/IPs
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.
Installation
This backdoor drops the following copies of itself into the affected system:
- %System%\msfullcomen.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 adds the following mutexes to ensure that only one of its copies runs at any one time:
- KDKD&^*#F
Autostart Technique
This backdoor adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{343F94C0-7BF8-95A0-9892-DE5C539F2AF8}
StubPath = "%System%\msfullcomen.exe"
Other System Modifications
This backdoor adds the following registry keys:
HKEY_CURRENT_USER\Software\Local AppWizard-Generated Applications
Propagation
This backdoor does not have any propagation routine.
Backdoor Routine
This backdoor opens the following port(s) where it listens for remote commands:
- TCP port 443
It opens a hidden Internet Explorer window.
It connects to the following URL(s) to send and receive commands from a remote malicious user:
- {BLOCKED}i.zyns.com
However, as of this writing, the said sites are inaccessible.
Dropping Routine
This backdoor does not drop any other file.
Download Routine
This backdoor does not have any downloading capability.
Other Details
Based on analysis of the codes, it has the following capabilities:
- Capture screen, audio, and webcam
- Key logger
- List active ports
- Manage open windows
- Manage passwords
- Manage registry, processes, services, devices, and installed applications
- Perform multiple simultaneous transfers
- Perform remote shell
- Relay server
- Searh files
- Share servers
- Update, restart, terminates itself
It deletes the initially executed copy of itself
NOTES:
This backdoor does not have rootkit capabilities.
This backdoor does not exploit any vulnerability.
SOLUTION
9.200
8.483.00
09 Oct 2011
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
Terminate a malware/grayware process
*Note: If the detected process is not displayed in theWindows Task Manager, continue doing the next steps.
- %System%\msfullcomen.exe
Step 3
Delete this registry key
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\Active Setup\Installed Components
- {343F94C0-7BF8-95A0-9892-DE5C539F2AF8}
- {343F94C0-7BF8-95A0-9892-DE5C539F2AF8}
- In HKEY_CURRENT_USER\Software
- Local AppWizard-Generated Applications
- Local AppWizard-Generated Applications
Step 4
Scan your computer with your Trend Micro product to delete files detected as BKDR_POISON.BGZ. 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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