Ransomware Research

About Black Worm

Black Worm

Black Worm was first discovered in December 2018 in enterprise cloud environments.

Name Black Worm
First Seen December 2018


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

HiddenTear » Black Worm

Behavior of Black Worm

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

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

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Characteristics of Black Worm

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


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 Black Worm 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 Black Worm.

File NameREAD_IT.txt


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

Executablesmyfile.exe, ROBLOXHACK.bat, ef781910bc5e8aab3761591acadf8bb6.gxe, svchost.exe
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.

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