Win32/Filecoder [Threat Name] go to Threat

Win32/Filecoder.E [Threat Variant Name]

Category trojan,worm
Size 15872 B
Aliases Trojan.Win32.Filecoder.h (Kaspersky)
  Trojan.Horse (Symantec)
  Generic.dx!hkz (McAfee)
Short description

Win32/Filecoder.E is a trojan that encrypts files on local drives. To decrypt files the user is requested to send an SMS message to a specified telephone number in exchange for a password/instructions.


When executed, the trojan copies itself into the following location:

  • %system%\­FYKRAGNL.exe

The trojan creates the following files:

  • %drive%\­HOW TO DECRYPT FILES.txt

The following Registry entries are created:

  • [HKEY_CLASSES_ROOT\­.crypted]
    • "(Default)" = "LQWGAQGIVE"
    • "(Default)" = "CRYPTED!"
    • "(Default)" = "%system%\­FYKRAGNL.exe,0"
  • [HKEY_CLASSES_ROOT\­LQWGAQGIVE\­shell\­open\­command]
    • "(Default)" = "%system%\­FYKRAGNL.exe "%1""
Payload information

Win32/Filecoder.E is a trojan that encrypts files on local drives.

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

  • .3gp
  • .amr
  • .avi
  • .bmp
  • .doc
  • .img
  • .iso
  • .jpg
  • .mov
  • .mp3
  • .mp4
  • .msi
  • .nrg
  • .pdf
  • .php
  • .ppt
  • .psd
  • .rar
  • .txt
  • .vob
  • .wmv
  • .xls
  • .zip

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 ".crypted" extension is appended.

The trojan encrypts the file content.

The trojan then deletes found files.

Other information

The trojan displays the following message:

The trojan displays the following dialog box:

The encrypted files can be returned to their original state using the following password:

  • PozdRAvLyAeM

When the correct password is entered the trojan removes itself from the computer.

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