Ransomware Research

Gremit Ransomware

Gremit is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on November 1, 2016, this ransomware has been actively targeting systems worldwide.

Quick facts

Ransomware Family
Gremit
First Seen
November 1, 2016

How Gremit ransomware works

File encryption patterns

Gremit modifies encrypted files using specific patterns to mark them as encrypted:

Extensions added after encryption
.rnsmwr

Ransom note and payment demands

After encrypting files, Gremit displays ransom notes demanding payment for file recovery:

message
notes/note.txt
Location: OnceOnCompletion

Technical indicators

Associated executable files

The following executable files are associated with Gremit ransomware:

About this analysis

This Gremit ransomware analysis is part of Elastio's comprehensive ransomware detection database. Elastio provides advanced ransomware protection and recovery, helping organizations defend against and recover from ransomware attacks like Gremit.

Last updated: December 30, 2025

Detection coverage

Elastio detects Gremit inside your data and backups.

The Hunt Engine uses Deep File Inspection to identify Gremit across live data, replicated data, and backups. If this family is in your environment, Elastio finds it before encryption completes. Run a scan against your recovery points to confirm.

See How the Hunt Engine WorksRequest a Demo

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What is Gremit Ransomware? | Elastio