TROJ_FAKEAV.THK

The added .JOB files (scheduled tasks) attempt to access a URL. The said URL only displays a nonmalicious image when accessed. It may require additional parameters to download other possibly malicious file(s). It displays certain graphical user interface (GUI) upon execution.

This Trojan does not have any backdoor capability.

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.

It deletes itself after execution.

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.

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 copies of itself into the affected system:

• %Application Data%\hotfix.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.)

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Winlogon
Shell = %Application Data%\hotfix.exe

Other System Modifications

This Trojan adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
WarnOnZoneCrossing = 0

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
WarnOnPostRedirect = 0

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
WarnonBadCertRecving = 0

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Schedule
AtTaskMaxHours = 48

Dropping Routine

This Trojan drops the following files:

• %Windows%\Tasks\At1.job - scheduled task pointing to a URL
• %Windows%\Tasks\At2.job - scheduled task pointing to a URL
• %Windows%\Tasks\At3.job - scheduled task pointing to a URL
• %Windows%\Tasks\At4.job - scheduled task pointing to a URL
• %Windows%\Tasks\At5.job - scheduled task pointing to a URL
• %Windows%\Tasks\At6.job - scheduled task pointing to a URL
• %Windows%\Tasks\At7.job - scheduled task pointing to a URL
• %Windows%\Tasks\At8.job - scheduled task pointing to a URL
• %Windows%\Tasks\At9.job - scheduled task pointing to a URL
• %Windows%\Tasks\At10.job - scheduled task pointing to a URL
• %Windows%\Tasks\At11.job - scheduled task pointing to a URL
• %Windows%\Tasks\At12.job - scheduled task pointing to a URL
• %Windows%\Tasks\At13.job - scheduled task pointing to a URL
• %Windows%\Tasks\At14.job - scheduled task pointing to a URL
• %Windows%\Tasks\At15.job - scheduled task pointing to a URL
• %Windows%\Tasks\At16.job - scheduled task pointing to a URL
• %Windows%\Tasks\At17.job - scheduled task pointing to a URL
• %Windows%\Tasks\At18.job - scheduled task pointing to a URL
• %Windows%\Tasks\At19.job - scheduled task pointing to a URL
• %Windows%\Tasks\At20.job - scheduled task pointing to a URL
• %Windows%\Tasks\At21.job - scheduled task pointing to a URL
• %Windows%\Tasks\At22.job - scheduled task pointing to a URL
• %Windows%\Tasks\At23.job - scheduled task pointing to a URL
• %Windows%\Tasks\At24.job - scheduled task pointing to a URL
• %Desktop%\ThinkPoint.lnk - shortcut file pointing to a copy of the malware
• %Start Menu%\Programs\ThinkPoint.lnk - shortcut file pointing to a copy of the malware
• %Application Data%\completescan - non-malicious file
• %Application Data%\install - non-malicious file
• %Application Data%\start - non-malicious file

(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.. %Desktop% is the current user's desktop, which is usually C:\Windows\Profiles\{user name}\Desktop on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Desktop on Windows NT, and C:\Documents and Settings\{User Name}\Desktop 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.. %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.)

Other Details

This Trojan does the following:

• This Trojan has no backdoor capability.
• The added .JOB files (scheduled tasks) attempt to access the following URL:
  
  • http://{BLOCKED}arsshow.com/jhkhj.php?kxdkhjk=
  
  The said URL only displays a nonmalicious image when accessed. It may require additional parameters to download other possibly malicious file(s). Upon execution, it displays the following graphical user interface (GUI):
  

  

  
  

  

  
  

  

  
  

  

It deletes itself after execution.

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.