Backdoor:W32/Hupigon.OGA

Classification

Malware

Backdoor

W32

Backdoor.Win32.Hupigon.dsbm

Summary

A remote administration utility which bypasses normal security mechanisms to secretly control a program, computer, or network.

Automatic action

Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.

Suspect a file is incorrectly detected (a False Positive)?

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

  • Check for the latest database updates

    First check if your F-Secure security program is using the latest detection database updates, then try scanning the file again.

  • Submit a sample

    After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.

    NOTE If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.

  • Exclude a file from further scanning

    If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.

    Note You need administrative rights to change the settings.

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Technical Details

Upon execution, this Hupigon variant creates the following files:

  • %windir%\temp\a.exe
  • %windir%\temp\b.exe

Only the file called "b.exe" is executed, which is detected as Backdoor:W32/Hupigon.OGA.It modifies and executes the driver %systemdir%\drivers\beep.sys with its own kernel rootkit component.The modified beep.sys file is detected as Rootkit:W32/Agent.UI.

After the execution of Rootkit:W32/Agent.UI, Hupigon.OGA then restores the original data of the beep.sys file.It then drops a copy itself to the following directory:

  • %Programdir%\ime\sodata.exe

It executes sodata.exe as a driver.The following Registry key are then created:

  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Windows data Type = dword:00000110 Start = dword:00000002 ErrorControl = dword:00000000 ImagePath = "%programdir%\ime\sodata.exe" DisplayName = "Windows data" ObjectName = "LocalSystem" Description = "

File System Changes

Creates these files:

  • %windir%\temp\a.exe
  • %windir%\temp\b.exe