Ransomware Research

About Unit09


Unit09 was first discovered in January 2019 in enterprise cloud environments. Unit09 is found in environments with a number of different names, including MewWare, etc. For a full list of all names, please see below.

Name Unit09
  • MewWare
First Seen January 2019

Behavior of Unit09

Unit09 is known to target specific file types. Below are all known file types that Unit09 is known to infect.

In some cases, ransomware will update the modified date, when it encrypts files. Unit09 updates the last modified date of the file it targets.

Learn More

Characteristics of Unit09

Here are some of the unique characteristics that are helpful to know about Unit09.


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 Unit09 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 Unit09.

File Name$!READ ME.txt
How Elastio can help

Don’t let ransomware
take over your data.

Elastio is a cloud-native data resilience platform on AWS, providing robust security and assuring the recoverability of critical data in cloud environments.

Elastio protects data from ransomware and malware evading perimeter defenses and mitigates downtime, data loss, and reputational harm for businesses.