TROJ_FAKEAV.CLC

This Trojan adds certain registry entries to disable the Task Manager. This action prevents users from terminating the malware process, which can usually be done via the Task Manager.

It displays fake alerts that warn users of infection. It also displays fake scanning results of the affected system. It then asks for users to purchase it once scanning is completed. If users decide to purchase the rogue product, users are directed to a certain website asking for sensitive information, such as credit card numbers.

Installation

This Trojan drops the following copies of itself into the affected system:

• %User Temp%\AUTMGR32.EXE
• %User Temp%\topwesitjh

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)

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

• %User Temp%\mschrt20ex.dll - detected as same malware

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)

Other System Modifications

This Trojan adds the following registry entries as part of its installation routine:

HKEY_CLASSES_ROOT\secfile\shell\
open\command
@ = "%User Temp%\AUTMGR32.EXE" /START "%1" %*

HKEY_CLASSES_ROOT\.exe\shell\
open\command
@ = "%User Temp%\AUTMGR32.EXE" /START "%1" %*

HKEY_CURRENT_USER\Software\Classes\
.exe\shell\open\
command
@ = "%User Temp%\AUTMGR32.EXE" /START "%1" %*

HKEY_CURRENT_USER\Software\Classes\
secfile\shell\open\
command
@ = "%User Temp%\AUTMGR32.EXE" /START "%1" %*

It adds the following registry entries to disable the Task Manager:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
DisableTaskMgr = 1

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
system
DisableTaskMgr = 1

Dropping Routine

This Trojan drops the following files:

• %User Temp%\wscsvc32.exe - detected by Trend Micro as TROJ_FAKEAV.SMEV

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)

Rogue Antivirus Routine

This Trojan displays fake alerts that warn users of infection. It also displays fake scanning results of the affected system. It then asks for users to purchase it once scanning is completed. If users decide to purchase the rogue product, users are directed to a certain website asking for sensitive information, such as credit card numbers.