TROJ_DROPPER.IJX
Windows 2000, XP, Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
TECHNICAL DETAILS
Arrival Details
This Trojan 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 Trojan drops the following files:
- %WINDOWS%\services.exe - detected as WORM_AUTORUN.FJI
- %WINDOWS%\oodbnt2.ini
- %WINDOWS%\UNINSTALLC32.exe - detected as TROJ_FALERT.MCS
- %WINDOWS%\LastGood\system32\scrrun.dll
- %system%\dllcache\scrrun.dll
- %USER TEMP%\errdlg.exe
- %USER TEMP%\rememberthistime.rar
- %USER TEMP%\Videoman1.exe
- %USER TEMP%\Videoman2.exe
It drops the following copies of itself into the affected system:
- %WINDOWS%\Pifex32.inf
It creates the following folders:
- %WINDOWS%\LastGood
- %WINDOWS%\LastGood\system32
- %Program Files%\Programs
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)
Other System Modifications
This Trojan also creates the following registry entry(ies) as part of its installation routine:
HKEY_LOCAL_MACHINE\SOFTWARE\Programs.exe\
Programs
Directory = %Program Files%\Programs
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\SharedDLLs
%system%\scrrun.dll = 1
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
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\Programs.exe
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\Windows\CurrentVersion\SharedDLLs
- %system%\scrrun.dll = 1
- %system%\scrrun.dll = 1
Step 4
Search and delete these files
- In %WINDOWS%\oodbnt2.ini
- %system%\dllcache\scrrun.dll
- %USER TEMP%\errdlg.exe
- %USER TEMP%\rememberthistime.rar
- %USER TEMP%\Videoman1.exe
- %USER TEMP%\Videoman2.exe
- %USER TEMP%\Videoman2.exe
- %USER TEMP%\Videoman1.exe
- %USER TEMP%\rememberthistime.rar
- %USER TEMP%\errdlg.exe
- %system%\dllcache\scrrun.dll
Step 5
Search and delete this folder
- In %WINDOWS%\LastGood
- %Program Files%\Programs
- %Program Files%\Programs
Step 6
Remove malware files dropped/downloaded by TROJ_DROPPER.IJX
- In TROJ_FALERT.MCS
- WORM_AUTORUN.FJI
- WORM_AUTORUN.FJI
Step 7
Scan your computer with your Trend Micro product to delete files detected as TROJ_DROPPER.IJX. 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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