TROJ_FAKEAV.ENJX
Windows 2000, Windows, XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Trojan may be unknowingly downloaded by a user while visiting malicious websites.
It opens a hidden Internet Explorer window.
TECHNICAL DETAILS
188,416 bytes
EXE
Yes
02 May 2011
Arrival Details
This Trojan may be unknowingly downloaded by a user while visiting malicious websites.
Installation
This Trojan drops the following files:
- %System%\dtqsn.dll
(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.)
Other System Modifications
This Trojan modifies the following registry key(s)/entry(ies) as part of its installation routine:
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{750fdf0e-2a26-11d1-a3ea-080036587f03}\InProcServer32
Default = "%System%\dtqsn.dll"
(Note: The default value data of the said registry entry is %SystemRoot%\System32\cscui.dll.)
Other Details
This Trojan opens a hidden Internet Explorer window.
NOTES:
It attempts to access a random URL in this format:
- {9 random characters}.com
SOLUTION
9.200
8.132.10
02 May 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
Restart in Safe Mode
Step 3
Restore this modified 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\Classes\CLSID\{750fdf0e-2a26-11d1-a3ea-080036587f03}\InProcServer32
- From: Default = %System%\dtqsn.dll
To: Default = %SystemRoot%\System32\cscui.dll
- From: Default = %System%\dtqsn.dll
Step 4
Search and delete this file
- %System%\dtqsn.dll
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_FAKEAV.ENJX. 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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