BKDR_POISON.ZWQA
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Backdoor
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This backdoor may be dropped by other malware.
It connects to a website to send and receive information.
TECHNICAL DETAILS
49,152 bytes
EXE
Yes
20 Mar 2012
Arrival Details
This backdoor may be dropped by the following malware:
- TROJ_XLSDRP.C
Installation
This backdoor drops the following non-malicious file:
- %System Root%\asf
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
It creates the following folders:
- %System Root%\dfed
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
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\{CE683A0D-0668-F8CD-5F05-F9B718B4DDBF}
StubPath = "{malware path and filename}"
Other System Modifications
This backdoor adds the following registry keys:
HKEY_CURRENT_USER\Software\Put FilePath-Crete Applications
Backdoor Routine
This backdoor connects to the following websites to send and receive information:
- u1.{BLOCKED}ujd.info
SOLUTION
9.200
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
Remove malware files dropped/downloaded by BKDR_POISON.ZWQA
- TROJ_XLSDRP.C
Step 3
Restart in Safe Mode
Step 4
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_CURRENT_USER\Software
- Put FilePath-Crete Applications
- Put FilePath-Crete Applications
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components
- {CE683A0D-0668-F8CD-5F05-F9B718B4DDBF}
- {CE683A0D-0668-F8CD-5F05-F9B718B4DDBF}
Step 5
Search and delete these folders
- %System Root%\dfed
Step 6
Search and delete these files
- %System Root%\asf
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_POISON.ZWQA. 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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