TROJ_DROPPER.QVA

This Trojan may be dropped by other malware.

Arrival Details

This Trojan may be dropped by the following malware:

• TROJ_TARODRP.SM

Other System Modifications

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

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\Session Manager
PendingFileRenameOperations = \??\C:\WINDOWS\ntshrui.dll

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\Session Manager
AllowProtectedRenames = 1

Other Details

This Trojan does the following:

• It checks if the current user has admin rights in the system. If the user of the system has no admin rights, it then checks the startup folders of the system by getting the data of the value "Startup" in the following registry entry:
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders
• It then checks if the running process on the system is %User Profile%\Start Menu\Programs\Startup\Adobe_u.exe. If yes, it creates the following file:
  • %User Profile%\netui0.dll - detected as BKDR_GOLPECO.A
• The dropped file is then injected to explorer.exe.
• If %User Profile%\Start Menu\Programs\Startup\Adobe_u.exe is not the running process, it copies itself in the startup folder as follows:
  • %User Profile%\Start Menu\Programs\Startup\Adobe_u.exe
• It then performs the following command to delete the currently running file:
  • %User Profile%\Start Menu\Programs\Startup\Adobe_u.exe –s {executed malware file}
• If the user of the system has admin rights, it checks for the existence of the following key:
  • HKEY_Local_Machine\Software\Jiangmin
• It then drops the following file:
  • %User Profile%\ntshrui.dll - copy of netui0.dll, detected as BKDR_GOLPECO.A
• It then sets the timestamp of the dropped file using the timestamp of the normal %System%\ntshrui.dll.
• It creates the following registry keys so to copy its component file to %Windows% and load it as normal system file once the system starts up:
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\??\C:\Documents and Settings\WinXP\ntshrui.dll
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\??\C:\Documents and Settings\WINDOWS\ntshrui.dll

(Note: %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.. %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.. %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)