TROJ_FAKEAV.UUNB

This Trojan moves .LNK files to the created folder %User Temp%\smtmp. It also modifies the attributes of files found in the affected system into Hidden, to trick the users that the files have been deleted.

It may install itself on the infected system as a rogue antivirus using certain file names.

When users click "Fix Errors" in the fake scan results, this Trojan displays fake message boxes. When the user clicks "Purchase", it will display windows asking for the user's personal information. The said window displays content from certain websites

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 gathers certain information on the affected computer.

It deletes the initially executed copy of itself.

It installs a fake antivirus/antispyware software. 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 files:

• %System Root%\All Users\Application Data\{random file name}.exe - also detected as TROJ_FAKEAV.UUNB
• %Desktop%\{OS Name} Restore.lnk
• %Start Menu%\Programs\{OS Name} Restore\{OS Name} Restore.lnk
• %Start Menu%\Programs\{OS Name} Restore\Uninstall {OS Name} Restore.lnk

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %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.)

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

• %System Root%\All Users\Application Data\{random file name}.exe

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

It creates the following folders:

• %User Temp%\smtmp
• %Start Menu%\Programs\{OS Name} Restore

(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.. %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
{random file name} = "%System Root%\All Users\Application Data\{random file name}.exe"

Other System Modifications

This Trojan adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
ActiveDesktop
NoChangingWallpaper = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Associations
LowRiskFileTypes = "/{hq:/s`s:/ogn:/uyu:/dyd:/c`u:/bnl:/ble:/sdf:/lrh:/iul:/iulm:/fhg:/clq:/kqf:/`wh:/lqf:/lqdf:/lnw:/lq2:/l2t:/v`w:/rbs:"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Attachments
SaveZoneInformation = "1"

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoDesktop = "1"

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

It modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Download
CheckExeSIgnatures = "no"

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
Hidden = "0"

(Note: The default value data of the said registry entry is 1.)

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowSuperHidden = "0"

(Note: The default value data of the said registry entry is 1.)

Information Theft

This Trojan gathers the following information on the affected computer:

• Credit card information (i.e. card type, card number, expiration date, security code)
• Contact information (i.e. name, address, email, phone number)

Other Details

This Trojan displays the following message boxes:

It deletes the initially executed copy of itself

Rogue Antivirus Routine

This Trojan displays the following fake alerts:

It installs a fake antivirus/antispyware software.

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.

NOTES:

It moves .LNK files to the created folder %User Temp%\smtmp. It also modifies the attributes of files found in the affected system into Hidden, to trick the users that the files have been deleted.

It may install itself on the infected system as a rogue antivirus using the following names:

• {OS Name} Restore

When the user clicks "Fix Errors" in the fake scan results, the malware displays the following:

The said window displays content from any of the following sites:

• {BLOCKED}already.org
• {BLOCKED}also.org
• {BLOCKED}ant.org
• {BLOCKED}attached.org
• {BLOCKED}begun.org
• {BLOCKED}behavior.org
• {BLOCKED}hbreathe.org