Win32/Filecoder [Threat Name] go to Threat

Win32/Filecoder.B [Threat Variant Name]

Category	trojan,worm
Size	535552 B
Aliases	Trojan.Win32.Refroso.bex (Kaspersky)
	Trojan.Horse (Symantec)
	BackDoor-EBI (McAfee)

Win32/Filecoder.B is a trojan which deletes files with specific file extensions.

The trojan does not create any copies of itself.

The trojan creates the following folders:

The following files are dropped into the c:\vsworkdir\ folder:

The following Registry entries are created:

[HKEY_CURRENT_USER\Control Panel\Desktop]
- "ConvertedWallpaper" = "c:\vsworkdir\shantazh.jpg"
[HKEY_CURRENT_USER\Control Panel\Desktop\ConvertedWallpaper]
- "Last WriteTime" = "%hex_value%"
[HKEY_CURRENT_USER\Control Panel\Desktop]
- "Pattern" = ""

The trojan searches local drives for files with the following file extensions:

When the trojan finds a file matching the search criteria, it creates its duplicate.

The file name and extension of the newly created file is derived from the original one. An additional ".vscrypt" extension is appended.

The trojan encrypts the file content.

The trojan then deletes found files.

The trojan quits immediately if it detects a window containing one of the following strings in its title:

The trojan may perform operating system restart.