Ransomware Research

Cortizol Ransomware

Cortizol is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on February 1, 2026, this ransomware has been actively targeting systems worldwide.

Quick facts

Ransomware Family
Cortizol
First Seen
February 1, 2026

How Cortizol ransomware works

File modification behavior

Cortizol updates file modification timestamps after encryption.

File encryption patterns

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

Extensions added after encryption
  • .Cortizol

Ransom note and payment demands

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

fileHOW_TO_RECOVER.txt
notes/HOW_TO_RECOVER.txt

Location: RootDiscs, Desktop

screenshot
notes/CachedImage_1849_898_POS4.jpg

Location: Desktop

Technical indicators

Associated executable files

The following executable files are associated with Cortizol ransomware:

  • Stub.exe

About this analysis

This Cortizol 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 Cortizol.

Last updated: April 29, 2026

Detection coverage

Elastio detects Cortizol inside your data and backups.

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