TROJ_ZLOB.DEC

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 modifies files, disabling programs and applications from properly running.

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%\nsg3.tmp
• %Program Files%\Key Generator
• %System Root%\Documents and Settings\Administrator
• %Start Menu%\Programs\Key Generator

(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 modifies the following files:

• %User Profile%\Application Data\Microsoft

(Note: %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.)

It deletes the following files:

• %User Temp%\nsg1.tmp
• %User Temp%\nsg3.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_CURRENT_USER\Software\Internet Security

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
Key Generator

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Internet Security
Type = "1"

HKEY_CURRENT_USER\Software\Internet Security
Path = "%Program Files%\Key Generator"

HKEY_CURRENT_USER\Software\Internet Security
Removable = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Key Generator
ProductionEnvironment = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Key Generator
DisplayName = "Key Generator 6.0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Key Generator
UninstallString = "%Program Files%\Key Generator\uninst.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Key Generator
DisplayIcon = "%Program Files%\Key Generator\uninst.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Key Generator
DisplayVersion = "6.0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Key Generator
URLInfoAbout = "http://www.{BLOCKED}generator.com"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Key Generator
Publisher = "Key Generator Inc."

Dropping Routine

This Trojan drops the following files:

• %User Temp%\nsg2.tmp
• %User Temp%\nsg3.tmp\reuninstall.ini
• %User Temp%\nsg3.tmp\ioSpecial.ini
• %User Temp%\nsg3.tmp\modern-wizard.bmp
• %User Temp%\nsg3.tmp\modern-header.bmp
• %User Temp%\nsg3.tmp\sxs.dll
• %Program Files%\Key Generator\keygenerator.exe
• %Program Files%\Key Generator\KeyGenerator.exe.manifest
• %Start Menu%\Programs\Key Generator\Key Generator.lnk
• %Desktop%\Key Generator.lnk
• %Start Menu%\Programs\Key Generator\Key Generator login.lnk
• %Program Files%\Key Generator\uninst.exe
• %User Temp%\nsg3.tmp\InstallOptions.dll
• %User Profile%\Microsoft\Crypto
• %User Profile%\Crypto\RSA
• %User Profile%\RSA\S-1-5-21-4025279379-4087772427-2915903831-500

(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.. %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.)

This report is generated via an automated analysis system.