.YKCOL File Extension

Locky Ransomware Encrypted File

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What is a YKCOL 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.

More Information

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.

NOTE: YKCOL is LOCKY backwards.

How to open a YKCOL file

Unfortunately, there is no program currently available to effectively restore YKCOL files to their original state. If you backup your files you can execute a full system restore.


FileInfo.com recommends you never pay a ransom to decrypt files encrypted by ransomware. Paying a ransom encourages ransomware distributors to continue their efforts, and there is no guarantee that paying a ransom will give you access to your files. Instead, you should restore your data from a recent backup created before the ransomware infected your computer.

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Programs that open YKCOL files

System Restore

Verified by FileInfo.com

The FileInfo.com team has independently researched the Locky Ransomware Encrypted file format and Windows apps listed on this page. Our goal is 100% accuracy and we only publish information about file types that we have verified.

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