Ransomware Research

About BlockZ


BlockZ was first discovered in April 2022 in enterprise cloud environments.

Name BlockZ
First Seen April 2022


To better understand BlockZ, we can trace it’s origins. Below is a snapshot of BlockZ’s genealogy.

Babuk » BlockZ

Behavior of BlockZ

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

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

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Characteristics of BlockZ

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


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 BlockZ 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 BlockZ.

File NameHow To Restore Your Files.txt

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 BlockZ.

External Pages
  • mailto:blockzsupport@protonmail.com
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