Ransomware Research

About BlueCheeser


BlueCheeser was first discovered in January 2020 in enterprise cloud environments.

Name BlueCheeser
First Seen January 2020

Behavior of BlueCheeser

BlueCheeser is known to target specific file types. Below are all known file types that BlueCheeser is known to infect.

In some cases, ransomware will update the modified date, when it encrypts files. BlueCheeser updates the last modified date of the file it targets.

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Characteristics of BlueCheeser

Here are some of the unique characteristics that are helpful to know about BlueCheeser.


Some ransomware will change or append a suffix to the end of the file after they are encrypted, including changing the extension of a file. Here are some of the possible suffixes that BlueCheeser ransomware is known to change.


Ransomware Notes

Not all ransomware leaves a note. However, some ransomware leaves the infected party instructions on what the user should do to get rid of the ransomware, or satisfy the ransom. This often involves transferring money, often bitcoin or another cryptocurrency to a designated wallet.

Below are the type(s) of notes, content, and typical locations where Elastio has found ransom notes from BlueCheeser.

File NameInstructions.txt


These are the names of the executables that contain the undetonated ransomware payload for BlueCheeser.

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