TROJ_NITOL.SMJ

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 drops the following file(s)/component(s):

• %System%\quwquy.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

It drops the following copies of itself into the affected system:

• %System Root%\Documents and Settings\Administrator\Local Settings\Temp\lpk.dll
• %System Root%\Documents and Settings\Administrator\Local Settings\Temp\0000679d\lpk.dll
• %System%\hra33.dll
• %All Users Profile%\Application Data\lpk.dll

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %System% is the Windows system folder, which is usually C:\Windows\System32.. %All Users Profile% is the All Users or Common profile folder, which is C:\Documents and Settings\All Users in Windows 2000, XP, and Server 2003, and C:\ProgramData in Windows Vista and 7.)

It creates the following folders:

• %System Root%\Documents and Settings\Administrator\Local Settings\Temp
• %System Root%\Documents and Settings\LocalService\Application Data\WinRAR

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

Other System Modifications

This Trojan adds the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\National

It adds the following registry entries as part of its installation routine:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\National
ImagePath = "%System%\quwquy.exe"

NOTES:
This malware drops copies of itself in folders where the executable file of each running process as lpk.DLL. It also drops a copy of itself in other drives.