BKDR_POISON.UWI
Windows 98, ME, NT, 2000, XP, Server 2003
Threat Type: Backdoor
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This backdoor may be downloaded by other malware/grayware/spyware from remote sites. It may be dropped by other malware. It may be unknowingly downloaded by a user while visiting malicious websites.
It creates registry entries to enable its automatic execution at every system startup.
It opens a hidden Internet Explorer window. It deletes itself after execution.
TECHNICAL DETAILS
45,056 b bytes
Yes
Arrival Details
This backdoor may be downloaded by other malware/grayware/spyware from remote sites.
It may be dropped by other malware.
It may be unknowingly downloaded by a user while visiting malicious websites.
Installation
This backdoor drops the following copies of itself into the affected system and executes them:
- %system%\msoftsvhost.exe
It injects itself into the following processes as part of its memory residency routine:
- explorer.exe
Autostart Technique
This backdoor creates the following registry entries to enable automatic execution of dropped component at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{B0466698-BB0E-6D4D-50EA-BDC7BC1D4BD6}
StubPath = %system%\msoftsvhost.exe
Other Details
This backdoor opens a hidden Internet Explorer window.
It deletes itself after execution.
SOLUTION
8.900
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\Active Setup\Installed Components\{B0466698-BB0E-6D4D-50EA-BDC7BC1D4BD6}
- StubPath=%system%\msoftsvhost.exe
- StubPath=%system%\msoftsvhost.exe
Step 4
Scan your computer with your Trend Micro product to delete files detected as BKDR_POISON.UWI. 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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