Ransomware Research

About BrainLag


BrainLag was first discovered in July 2017 in enterprise cloud environments.

Name BrainLag
First Seen July 2017


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

HiddenTear » BrainLag

Behavior of BrainLag

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

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

Learn More

Characteristics of BrainLag

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


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 BrainLag 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 BrainLag.

File Nameread_me.txt


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

Executableshidden-tear.exe, local.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.