BKDR_PCCLIENT.XJ
Windows 2000, XP, Server 2003
Threat Type: Backdoor
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
As of this writing, the said sites are inaccessible.
TECHNICAL DETAILS
Autostart Technique
This backdoor registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\whqezllj
Type = 1
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\whqezllj
Start = 3
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\whqezllj
ErrorControl = 1
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\whqezllj
ImagePath = "\??\%System%\drivers\whqezllj.sys"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\whqezllj
DisplayName = "whqezllj"
Download Routine
As of this writing, the said sites are inaccessible.
Other Details
This backdoor connects to the following possibly malicious URL:
- http://eads.lucky.{BLOCKED}u.com/index.asp?503000020001
- http://eadssystem.{BLOCKED}eip.net/index.asp?503000020001
SOLUTION
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
Scan your computer with your Trend Micro product and note files detected as BKDR_PCCLIENT.XJ
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_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
- whqezllj
- whqezllj
Step 5
Search and delete the file detected as BKDR_PCCLIENT.XJ
Step 6
Scan your computer with your Trend Micro product to delete files detected as BKDR_PCCLIENT.XJ. 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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