TROJ_FAM_000005600.TOMA

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\Wilbert
• %User Profile%\LOCALS~1
• %User Temp%\nst3.tmp
• %Program Files%\MailSkinner
• %Start Menu%\Programs\MailSkinner

(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%\nso1.tmp
• %User Temp%\nst3.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\MailSkinner

HKEY_LOCAL_MACHINE\Software\MailSkinner

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
MailSkinner

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\MailSkinner
grpid = "37"

HKEY_CURRENT_USER\Software\MailSkinner
grpid = "37"

HKEY_LOCAL_MACHINE\SOFTWARE\MailSkinner
InstallOpt1 = "1"

HKEY_CURRENT_USER\Software\MailSkinner
InstallOpt1 = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\MailSkinner
installdt = "20081126"

HKEY_CURRENT_USER\Software\MailSkinner
installdt = "20081126"

HKEY_CURRENT_USER\Software\MailSkinner
uai = "{random characters}"

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

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
MailSkinner
UninstallString2 = "%Program Files%\MailSkinner\uninst.exe /S"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
MailSkinner
DisplayIcon = "%Program Files%\MailSkinner\MailSkinner.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
MailSkinner
DisplayVersion = "1.0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
MailSkinner
URLInfoAbout = "http://www.{BLOCKED}inner.com"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
MailSkinner
Publisher = "OOO «Favorit»"

HKEY_LOCAL_MACHINE\SOFTWARE\MailSkinner
Installer Language = "1033"

Dropping Routine

This Trojan drops the following files:

• %User Temp%\nsd2.tmp
• %User Temp%\nst3.tmp\LangDLL.dll
• %User Temp%\nst3.tmp\ioSpecial.ini
• %User Temp%\nst3.tmp\modern-wizard.bmp
• %User Temp%\nst3.tmp\InstallOptions.dll
• %Program Files%\MailSkinner\anim_0.gif
• %Program Files%\MailSkinner\MailSkinner.exe
• %Program Files%\MailSkinner\anim_help.gif
• %Program Files%\MailSkinner\OLSkinner.dll
• %Start Menu%\Programs\MailSkinner\MailSkinner.lnk
• %Start Menu%\Programs\MailSkinner\Uninstall.lnk
• %Program Files%\MailSkinner\uninst.exe

(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.)

This report is generated via an automated analysis system.