W32/Bifrose-PN

Category: Viruses and SpywareProtection available since:08 Dec 2006 00:00:00 (GMT)
Type: Win32 wormLast Updated:08 Dec 2006 00:00:00 (GMT)
Prevalence: Small Number of Reports

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W32/Bifrose-PN is a worm with IRC backdoor functionality for the Windows
platform.

W32/Bifrose-PN runs continuously in the background, providing a backdoor server
which allows a remote intruder to gain access and control over the computer via
IRC channels.

When first run W32/Bifrose-PN copies itself to <System>\drive.exe and creates
the file <System>\drivers\oreans32.sys.

oreans32.sys is a clean device driver and can be removed.

The following registry entries are created to run drive.exe on startup:

HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Microsoft Update
drive.exe

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Microsoft Update
drive.exe

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
Microsoft Update
drive.exe

The file oreans32.sys is registered as a new system driver service named
"oreans32", with a display name of "oreans32". Registry entries are created
under:

HKLM\SYSTEM\CurrentControlSet\Services\oreans32