TROJ_FAKEAV.SMLF

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.

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 creates the following folders:

• %System Root%\DOCUME~1
• %System Root%\DOCUME~1\ADMINI~1
• %User Profile%\LOCALS~1
• %User Temp%\nsx3.tmp
• %Program Files%\GreatDefender Software
• %Program Files%\GreatDefender Software\GreatDefender
• %Start Menu%\Programs\GreatDefender

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.. %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.. %Program Files% is the default Program Files folder, usually C:\Program Files.. %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.)

Other System Modifications

This Trojan deletes the following files:

• %User Temp%\nsn1.tmp
• %User Temp%\nsx3.tmp

(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 adds the following registry keys:

HKEY_LOCAL_MACHINE\Software\GreatDefender

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
GreatDefender

HKEY_CURRENT_USER\Software\GreatDefender

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\GreatDefender
Lang = "English"

HKEY_LOCAL_MACHINE\SOFTWARE\GreatDefender
Install_Dir = "%Program Files%\GreatDefender Software\GreatDefender"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
GreatDefender
DisplayName = "GreatDefender"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
GreatDefender
UninstallString = "%Program Files%\GreatDefender Software\GreatDefender\uninstall.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
GreatDefender
NoModify = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
GreatDefender
NoRepair = "1"

HKEY_CURRENT_USER\Software\GreatDefender
CurrentVersion = "{random characters}"

HKEY_CURRENT_USER\Software\GreatDefender
AgentsSettings = "1"

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DirectDraw\MostRecentApplication
Name = "GreatDefender.exe"

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DirectDraw\MostRecentApplication
ID = "42c9283e"

(Note: The default value data of the said registry entry is 41107b81.)

It deletes the following registry keys:

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Explorer\
ControlPanel\NameSpace\{7A9D77BD-5403-11d2-8785-2E0420524153}

Dropping Routine

This Trojan drops the following files:

• %User Temp%\nsc2.tmp
• %User Temp%\nsx3.tmp\LangDLL.dll
• %User Temp%\nsx3.tmp\ioSpecial.ini
• %User Temp%\nsx3.tmp\modern-wizard.bmp
• %User Temp%\nsx3.tmp\InstallOptions.dll
• %User Temp%\nsx3.tmp\nsProcess.dll
• %Program Files%\GreatDefender Software\GreatDefender\GreatDefender.exe
• %Program Files%\GreatDefender Software\GreatDefender\uninstall.exe
• %Start Menu%\Programs\GreatDefender\1 GreatDefender.lnk
• %Start Menu%\Programs\GreatDefender\2 Homepage.lnk
• %Start Menu%\Programs\GreatDefender\3 Uninstall.lnk
• %Desktop%\GreatDefender.lnk

(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.. %Program Files% is the default Program Files folder, usually C:\Program Files.. %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.. %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.)

Other Details

This Trojan connects to the following possibly malicious URL:

• http://www.{BLOCKED}efender.com/report

This report is generated via an automated analysis system.