TROJ_DOWNLOADER_00005fa.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\ADMINI~1
• %User Profile%\LOCALS~1
• %User Temp%\nsm3.tmp
• %System Root%\Documents and Settings
• %System Root%\Documents and Settings\All Users
• %Start Menu%\Programs
• %Start Menu%\Programs\Games-Attack
• %User Profile%\Application Data
• %User Profile%\Application Data\Games-Attack

(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.. %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%\nsr1.tmp
• %User Temp%\nsm3.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\Games-Attack

HKEY_CURRENT_USER\Software\Games-Attack

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Games-Attack
dl_lg = "3D3D3D3DEN"

HKEY_CURRENT_USER\Software\Games-Attack
dl_lg = "3D3D3D3DEN"

HKEY_LOCAL_MACHINE\SOFTWARE\Games-Attack
grpid = "2046"

HKEY_CURRENT_USER\Software\Games-Attack
grpid = "2046"

HKEY_LOCAL_MACHINE\SOFTWARE\Games-Attack
installdt = "20111027"

HKEY_CURRENT_USER\Software\Games-Attack
installdt = "20111027"

HKEY_CURRENT_USER\Software\Games-Attack
uai = "http://www.{BLOCKED}attack.com/congratulation.php?lg=3D3D3D3DEN&grpid=2046"

HKEY_LOCAL_MACHINE\SOFTWARE\Games-Attack
dl_browser = "IE"

HKEY_CURRENT_USER\Software\Games-Attack
dl_browser = "IE"

HKEY_LOCAL_MACHINE\SOFTWARE\Games-Attack
dl_hp_url = "http://www.{BLOCKED}-solver.com/?t=Q111027&s=h"

HKEY_CURRENT_USER\Software\Games-Attack
dl_hp_url = "http://www.{BLOCKED}-solver.com/?t=Q111027&s=h"

HKEY_LOCAL_MACHINE\SOFTWARE\Games-Attack
dl_se_name = "Search Solver"

HKEY_CURRENT_USER\Software\Games-Attack
dl_se_name = "Search Solver"

HKEY_LOCAL_MACHINE\SOFTWARE\Games-Attack
dl_se_url = "http://www.{BLOCKED}-solver.com/result.php?t=Q111027&s=b&keywords={searchTerms}"

HKEY_CURRENT_USER\Software\Games-Attack
dl_se_url = "http://www.{BLOCKED}-solver.com/result.php?t=Q111027&s=b&keywords={searchTerms}"

HKEY_LOCAL_MACHINE\SOFTWARE\Games-Attack
dl_se_icon = "http://www.{BLOCKED}-solver.com/favicon.ico"

HKEY_CURRENT_USER\Software\Games-Attack
dl_se_icon = "http://www.{BLOCKED}-solver.com/favicon.ico"

HKEY_LOCAL_MACHINE\SOFTWARE\Games-Attack
ss_res = "http://download.{BLOCKED}attack.com/ss.php?lg=3D3D3D3DEN&grpid=2046"

HKEY_CURRENT_USER\Software\Games-Attack
ss_res = "http://download.{BLOCKED}attack.com/ss.php?lg=3D3D3D3DEN&grpid=2046"

HKEY_CURRENT_USER\Software\Games-Attack
_status = "ok"

HKEY_CURRENT_USER\Software\Games-Attack
uai = "http://www.{BLOCKED}attack.com/congratulation.php?lg=3D3D3D3DEN&grpid=2046&itype=1&res=-1"

HKEY_LOCAL_MACHINE\SOFTWARE\Games-Attack
sp_id = "1"

It modifies the following registry entries:

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

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DirectDraw\MostRecentApplication
ID = "4117b81"

(Note: The default value data of the said registry entry is 41107b3f.)

Dropping Routine

This Trojan drops the following files:

• %User Temp%\nsr2.tmp
• %User Temp%\nsm3.tmp\modern-header.bmp
• %User Temp%\nsm3.tmp\modern-wizard.bmp
• %User Temp%\nsm3.tmp\nsDialogs.dll
• %User Temp%\nsm3.tmp\System.dll
• %User Temp%\nsm3.tmp\header2.bmp
• %User Temp%\nsm3.tmp\FavoritDE.rtf
• %User Temp%\nsm3.tmp\FavoritEN.rtf
• %User Temp%\nsm3.tmp\FavoritES.rtf
• %User Temp%\nsm3.tmp\FavoritFR.rtf
• %User Temp%\nsm3.tmp\FavoritIT.rtf
• %Desktop%\Games-Attack.lnk
• %Start Menu%\Programs\Games-Attack\Games-Attack.lnk
• %Start Menu%\Programs\Games-Attack\Uninstall.lnk
• %User Temp%\nsm3.tmp\NSISdl.dll
• %User Temp%\GA.zip

(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.. %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.)

Other Details

This Trojan connects to the following possibly malicious URL:

• http://download.{BLOCKED}t-network.com/binaries/download.php
• http://www.{BLOCKED}attack.com/nilog.php?{random characters}

This report is generated via an automated analysis system.