TROJ_FAKEAV.RBA
Windows 98, ME, NT, 2000, XP, Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
However, as of this writing, the said sites are inaccessible.
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.
TECHNICAL DETAILS
Arrival Details
However, as of this writing, the said sites are inaccessible.
Installation
This Trojan drops the following copies of itself into the affected system:
- %User Temp%\MSDERUN.EXE
(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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)
It drops the following files depending on the platform/operating system of the affected computer:
- %User Temp%\topwesitjh
- %User Temp%\mschrt20ex.dll
- %User Temp%\wscsvc32.exe - detected as TROJ_FAKEAV.SMBE
(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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)
Other System Modifications
This Trojan adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
DisableTaskMgr = 1
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
system
DisableTaskMgr = 1
HKEY_CURRENT_USER\Software
24d1ca9a-a864-4f7b-86fe-495eb56529d8 = {blank}
HKEY_CURRENT_USER\Software
7bde84a2-f58f-46ec-9eac-f1f90fead080 = {blank}
Download Routine
This Trojan accesses the following websites to download files:
- http://Seattle-Traffic.com/readdatagateway.php
- http://Seattle-Traffic.com/any2/139-direct.ex
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.
SOLUTION
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Step 2
Identify and terminate files detected as TROJ_FAKEAV.RBA
- Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
- If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
- If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.
Step 3
Restore these modified registry values
Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.
- In HKEY_CLASSES_ROOT\.exe
- From: (Default)=secfile
To: exefile
- From: (Default)=secfile
Step 4
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System
- DisableTaskMgr=1
- DisableTaskMgr=1
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system
- DisableTaskMgr=1
- DisableTaskMgr=1
- In HKEY_CURRENT_USER\Software
- 24d1ca9a-a864-4f7b-86fe-495eb56529d8={blank}
- 24d1ca9a-a864-4f7b-86fe-495eb56529d8={blank}
- In HKEY_CURRENT_USER\Software
- 7bde84a2-f58f-46ec-9eac-f1f90fead080={blank}
- 7bde84a2-f58f-46ec-9eac-f1f90fead080={blank}
Step 5
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_CLASSES_ROOT
- secfile
- secfile
Step 6
Search and delete this file
%User Temp%\mschrt20ex.dll
%User Temp%\wscsvc32.exe
Step 7
Scan your computer with your Trend Micro product to delete files detected as TROJ_FAKEAV.RBA. 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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