Ransomware Research

Tripoli Ransomware

Tripoli is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on March 1, 2021, this ransomware has been actively targeting systems worldwide.

Quick facts

Ransomware Family
Tripoli
First Seen
March 1, 2021

How Tripoli ransomware works

File encryption patterns

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

Extensions added after encryption
./\..+?crypt$/.Cat4er

Ransom note and payment demands

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

fileHOW_FIX_FILES.htm
notes/HOW_FIX_FILES.htm
Location: EveryFolder

Technical indicators

Associated executable files

The following executable files are associated with Tripoli ransomware:

About this analysis

This Tripoli 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 Tripoli.

Last updated: December 30, 2025

Detection coverage

Elastio detects Tripoli inside your data and backups.

The Hunt Engine uses Deep File Inspection to identify Tripoli 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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