TROJ_STARTP.SMA4

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 disables Task Manager, Registry Editor, and Folder Options.

It deletes itself after execution.

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:

• %Program Files%\Winrar

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

Other System Modifications

This Trojan deletes the following files:

• %Desktop%.ini
• %User Profile%\Quick Launch\Launch Internet Explorer Browser.lnk
• %User Profile%\Quick Launch\Show Desktop.scf
• %Windows%\fonts\msgothic.ttf
• %Windows%\fonts\msuigoth.ttf
• %Windows%\fonts\MSMINCHO.TTF
• %Windows%\fonts\Gulim.ttf
• %Windows%\fonts\Gulimche.ttf
• %Windows%\fonts\Dotum.ttf
• %Windows%\fonts\Batang.ttf
• %Windows%\fonts\Gungsuh.ttf
• %Windows%\fonts\Simsun.ttf
• %Windows%\fonts\nsimsun.ttf
• %Windows%\fonts\MingLiU.ttf
• %Windows%\fonts\pmingliu.ttf
• %System%\SET3.tmp
• %System%\kbd101b.dll
• %System%\SET5.tmp
• %System%\kbd101c.dll
• %System%\SET7.tmp
• %System%\kbd103.dll
• %System%\SET9.tmp
• %System%\kbd106.dll
• %System%\SETB.tmp
• %System%\kbdjpn.dll
• %System%\SETD.tmp
• %System%\kbdkor.dll

(Note: %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\Desktop on Windows Vista and 7.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %Windows% is the Windows folder, which is usually C:\Windows.. %System% is the Windows system folder, which is usually C:\Windows\System32.)

It adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
HideDesktopIcons

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
HideDesktopIcons\NewStartPanel

HKEY_CLASSES_ROOT\lnkfile\shell\
open

HKEY_CLASSES_ROOT\lnkfile\shell\
open\command

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
HideDesktopIcons
ClassicStartMenu = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
HideDesktopIcons\NewStartPanel
{871C5380-42A0-1069-A2EA-08002B30309D} = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU
Enable = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU
Size = "a"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU
InitHits = "64"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU
Factor = "14"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International
W2KLpk = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International
W2KLpk = "0"

It modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
StartPage
Favorites = "{random values}"

(Note: The default value data of the said registry entry is {random values}.)

It creates the following registry entry(ies) to disable Task Manager, Registry Tools and Folder Options:

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

It deletes the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.lnk\ShellEx\{000214EE-0000-0000-C000-000000000046}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.lnk\ShellEx\{000214F9-0000-0000-C000-000000000046}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.lnk\ShellEx\{00021500-0000-0000-C000-000000000046}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.lnk\ShellEx\{BB2E617C-0920-11d1-9A0B-00C04FC2D6C1}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.lnk\ShellEx

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
lnkfile\CLSID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
lnkfile\shellex\ContextMenuHandlers\
{00021401-0000-0000-C000-000000000046}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
lnkfile\shellex\ContextMenuHandlers\
Offline Files

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
lnkfile\shellex\ContextMenuHandlers

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
lnkfile\shellex\PropertySheetHandlers\
ShimLayer Property Page

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
lnkfile\shellex\PropertySheetHandlers

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
lnkfile\shellex\DropHandler

Dropping Routine

This Trojan drops the following files:

• %User Temp%\aut1.tmp
• %User Temp%\monitor.jse
• %User Profile%\Quick Launch\Internet Explorer.lnk
• %Desktop%\Internet Explorer.lnk
• %System%\SET2.tmp
• %System%\SET4.tmp
• %System%\SET6.tmp
• %System%\SET8.tmp
• %System%\SETA.tmp
• %System%\SETC.tmp
• %System%\SET3.tmp
• %System%\SET5.tmp
• %System%\SET7.tmp
• %System%\SET9.tmp
• %System%\SETB.tmp
• %System%\SETD.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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\Desktop on Windows Vista and 7.. %System% is the Windows system folder, which is usually C:\Windows\System32.)

Other Details

This Trojan deletes itself after execution.

This report is generated via an automated analysis system.