TROJ_FAKEAV.BLV

October 20, 2009
 PLATFORM:

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

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.



This Trojan arrives as attachment to mass-mailed email messages. It may be downloaded by other malware/grayware/spyware from remote sites.



It creates folders where it drops its files.



It adds registry entries to enable its automatic execution at every system startup.



It modifies certain registry entries to disable Security Center functions. Doing this allows this malware to execute its routines without being detected.



It connects to certain URLs. It may do this to remotely inform a malicious user of its installation. It may also do this to download possibly malicious files onto the computer, which puts the computer at a greater risk of infection by other threats.



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 Web site asking for sensitive information, such as credit card numbers. It restarts the affected system.



  TECHNICAL DETAILS

File Size:

643988 bytes

Memory Resident:

Yes

Initial Samples Received Date:

14 Oct 2009


Arrival Details


This Trojan arrives as attachment to mass-mailed email messages.


It may be downloaded by the following malware/grayware/spyware from remote sites:

  • TROJ_BREDLAB.SMF



Installation



It drops the following copies of itself into the affected system:

  • %Application Data%\seres.exe
  • %Application Data%\svcst.exe
  • %Start Menu%\Programs\AntivirusPro_2010\AntivirusPro_2010.exe

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.. %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Profiles\{user name}\Start Menu on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu on Windows NT and C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003.)



Autostart Technique


This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Antivirus Pro 2010 = "%Program Files%\AntivirusPro_2010\AntivirusPro_2010.exe" /hide"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
mserv = "%Application Data%\seres.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
svchost = "%Application Data%\svcst.exe"



Other System Modifications


This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Control Panel\don't load
(Default) =  

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Associations
(Default) =  

HKEY_LOCAL_MACHINE\SOFTWARE\AntivirusPro_2010
(Default) =  


It modifies the following registry entries to disable Security Center functions:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
AntiVirusDisableNotify = "1"

(Note: The default value data of the said registry entry is 0.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
FirewallDisableNotify = "1"

(Note: The default value data of the said registry entry is 0.)

HKEY_LOCAL_MACHINESOFTWARE\Microsoft\Security Center
UpdatesDisableNotify = "1"

(Note: The default value data of the said registry entry is 0.)



Download Routine


This Trojan connects to the following malicious URLs:

  • http://{BLOCKED}e5skayert.com



Other Details


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 Web site asking for sensitive information, such as credit card numbers.


It restarts the affected system.


  SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

6.656.02

FIRST VSAPI PATTERN DATE:

27 Nov 2009

VSAPI OPR PATTERN File:

6.887.00

VSAPI OPR PATTERN Date:

02 Mar 2010


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


Remove malware files dropped/downloaded by TROJ_FAKEAV.BLV


Step 3


Delete this registry key

[ 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.

 
  • In HKEY_CURRENT_USER\Control Panel
    • don't load
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies
    • Associations
  • In HKEY_LOCAL_MACHINE\SOFTWARE
    • AntivirusPro_2010


Step 4


Delete this 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.

  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • Antivirus Pro 2010 = %Program Files%\AntivirusPro_2010\AntivirusPro_2010.exe /hide
    • mserv = %Application Data%\seres.exe
    • svchost = %Application Data%\svcst.exe


Step 5


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.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
    • From: AntiVirusDisableNotify = 1
      To: AntiVirusDisableNotify = 0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
    • From: FirewallDisableNotify = 1
      To: FirewallDisableNotify = 0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
    • From: UpdatesDisableNotify = 1
      To: UpdatesDisableNotify = 0
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Download
    • From: RunInvalidSignatures = 1
      To: RunInvalidSignatures = 0


Step 6


Search and delete these files

[ Learn More ]
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %Application Data%\doweqomob.pif 
  • %Application Data%\ereqiw.lib 
  • %Application Data%\ewina.pif 
  • %Application Data%\fenum.vbs 
  • %Application Data%\gopocis.sys 
  • %Application Data%\gotekufos.com 
  • %Application Data%\lipelogyc.reg 
  • %Application Data%\lizkavd.exe 
  • %Application Data%\Microsoft\Internet Explorer\Quick Launch\AntivirusPro_2010.lnk 
  • %Application Data%\seres.exe 
  • %Desktop%\AntivirusPro_2010.lnk 
  • %Program Files%\Common Files\pota.inf 
  • %Program Files%\Common Files\sepoxexij.scr 
  • %System%\_scui.cpl 
  • %System Root%\Documents and Settings\All Users\Documents\ikadubo._sy 
  • %System Root%\Documents and Settings\All Users\Documents\visaz.com 
  • %System Root%\Documents and Settings\All Users\Documents\yjowaxe.db 
  • %System Root%\Documents and Settings\All Users\Documents\yzuwan.bin 
  • %User Profile%\Local Settings\Temporary Internet Files\iwosotixuz.vbs 
  • %User Profile%\Local Settings\Temporary Internet Files\uwiva._dl 
  • %Windows%\akonuxak.dat 
  • %Windows%\eqake.bat 
  • %Windows%\isuni.vbs 
  • %Windows%\lozarer.inf 
  • %Windows%\owah.pif 
  • %Windows%\yfife.dl


Step 7


Scan your computer with your Trend Micro product to delete files detected as
TROJ_FAKEAV.BLV

*Note: 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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