PLATFORM:

Windows 98, ME, NT, 2000, XP, Server 2003

 OVERALL RISK RATING:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW



It may be downloaded by other malware/grayware/spyware from remote sites.
It may be unknowingly downloaded by a user while visiting malicious websites.
It modifies registry entries to enable its automatic execution at every system startup.
It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.
It deletes itself after execution.

  TECHNICAL DETAILS




Arrival Details


It may be downloaded by other malware/grayware/spyware from remote sites.


It may be unknowingly downloaded by a user while visiting malicious websites.



Autostart Technique


It modifies the following registry entries to ensure it automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
Shell='Explorer.exe rundll32.exe {Malware File Name} csxyfxr'

             (Note: The default value data of the said registry entry is 'Explorer.exe'.)



Dropping Routine


It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.



Installation


It drops the following file(s)/component(s):

  • %System%\{Random File Name} - detected as TROJ_DLOADR.SMVE


It deletes itself after execution.

  SOLUTION



Step 1
For Windows ME and XP users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2
Restore this modified registry value
[ Learn More ]

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.



Step 3
Scan your computer with your Trend Micro product to delete files detected as TROJ_OFICLA.AE 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.

Step 4
Remove malware files dropped/downloaded by TROJ_OFICLA.AE


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