TROJ_EPHI.FUB

This Trojan arrives as attachment to mass-mailed email messages. It may be dropped by other malware.

It does not have any propagation routine.

It does not have any backdoor routine.

It does not have any downloading capability.

Arrival Details

This Trojan arrives as attachment to mass-mailed email messages.

It may be dropped by other malware.

Installation

This Trojan drops the following files:

• %System Root%\Documents and Settings\All Users\Application Data\win3dx.DLL - also detected by Trend Micro as TROJ_EPHI.FUB
• %User Temp%\1234.exe - also detected by Trend Micro as TROJ_EPHI.FUB

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %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 drops the following non-malicious file:

• %User Temp%\a.pdf

(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.)

Autostart Technique

This Trojan registers its dropped component as a system service to ensure its automatic execution at every system startup. It does this by creating the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\win3dx
Type = "10"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\win3dx
Start = "2"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\win3dx
ErrorControl = "1"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\win3dx
ImagePath = "%SystemRoot%\system32\svchost.exe -k LocalService"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\win3dx
DisplayName = "win3dx"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\win3dx
ObjectName = "LocalSystem"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\win3dx\Parameters
ServiceDll = "%System Root%\Documents and Settings\All Users\Application Data\win3dx.DLL"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\win3dx\Parameters
ServiceMain = "FnqBcz"

It registers its dropped component as a system service to ensure its automatic execution at every system startup. It does this by creating the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\win3dx

Other System Modifications

This Trojan modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\SvcHost
LocalService = "{List of Local Services} win3dx"

(Note: The default value data of the said registry entry is {List of Local Services}.)

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Download Routine

This Trojan does not have any downloading capability.

NOTES:

It takes screenshots of the infected system and sends the images to the following remote server:

• usa.{BLOCKED}d.com:80

It does not have rootkit capabilities.

It does not exploit any vulnerability.