The File Extensions Database


.YKCOL File Extension

  • Category: Encoded Files

What is an .YKCOL file?

.YKCOL is Locky Ransomware Encrypted File

A YKCOL file is a file encrypted by the Locky Virus, a trojan horse utilized by cybercriminals. It contains a user's file, such as a .PDF or .WMV file, encrypted with the Locky Virus. YKCOL files became prevalent in 2017 and are similar to .LOCKY files.

The Locky virus is highly dangerous malware. It is commonly referred to as ransomware, where the purpose of the virus is to take your files hostage and force you to pay the perpetrator (typically by way of bitcoin) to unlock your files.

The virus is commonly introduced through spam emails titled "Status of invoice" with a .7Z attachment, which is a .VBS file compressed with 7-Zip compression. If you download the 7Z file and decompress it, the VBS file is run and the virus begins scrambling your files, renaming them with the ".ykcol" extension, and encrypting them. The virus then generates a .BMP (ykcol.bmp) or .HTM (ykcol.htm) ransom note informing you of the takeover and what you need to do to recover your files.

Unfortunately, there is no program currently available to effectively restore your files. If you backup your files you can execute a full system restore. Otherwise, the only known way to decrypt your infected files is to pay the perpetrator for the private key and decrypt program.

NOTE: YKCOL is LOCKY backwards.

How to solve problems with YKCOL files

  • Associate the YKCOL file extension with the correct application. On :
    Windows: Right click on any YKCOL file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.YKCOL files". Mac: Right click (or Ctrl-click) the YKCOL file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .YKCOL is Locky Ransomware Encrypted File. Because only the current version supports the latest YKCOL file format. Search, therefore, e.g. on the N/A manufacturer website after an available .YKCOL is Locky Ransomware Encrypted File update.
  • To make sure that your YKCOL file is not corrupted or virus-infected, get the file again and scan it with antivirus software.