Ransomware Research

About BlackSun


BlackSun was first discovered in September 2021 in enterprise cloud environments.

Name BlackSun
First Seen September 2021

Behavior of BlackSun

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

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

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Characteristics of BlackSun

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


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 BlackSun 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 BlackSun.

File NameBlackSun_README.txt


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


External Pages

Ransomware often links to external pages such as payment pages, telegram contacts, etc. Below are some of the URLs Elastio has found to be associated with BlackSun.

External Pages
  • mailto:bsprj1020@protonmail.com
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