Ransomware Research

Cerber Ransomware

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

Quick facts

Ransomware Family
Cerber
First Seen
February 1, 2016

How Cerber ransomware works

File modification behavior

Cerber updates file modification timestamps after encryption.

File encryption patterns

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

Extensions added after encryption
  • .cerber
  • .cerber2
  • .cerber3

Ransom note and payment demands

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

file# DECRYPT MY FILES #.html
notes/# DECRYPT MY FILES #.html

Location: EveryFolder

file# DECRYPT MY FILES #.txt
notes/# DECRYPT MY FILES #.txt

Location: EveryFolder

file# DECRYPT MY FILES #.url
notes/# DECRYPT MY FILES #.url

Location: EveryFolder

file# DECRYPT MY FILES #.vbs
notes/# DECRYPT MY FILES #.vbs

Location: EveryFolder

file# HELP DECRYPT #.html
notes/# HELP DECRYPT #.html

Location: EveryFolder

file# HELP DECRYPT #.txt
notes/# HELP DECRYPT #.txt

Location: EveryFolder

file# HELP DECRYPT #.url
notes/# HELP DECRYPT #.url

Location: EveryFolder

screenshot
notes/tmp7472.png

Location: Desktop

Technical indicators

Associated executable files

The following executable files are associated with Cerber ransomware:

  • instnm.exe
  • xwizard.exe
  • waitfor.exe
  • icardagt.exe
  • cmdkey.exe
  • ReAgentc.exe
  • lodctr.exe
  • IBxpv.exe
  • dialer.exe
  • gpresult.exe
  • rdrleakdiag.exe
  • eventvwr.exe
  • play.exe

About this analysis

This Cerber 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 Cerber.

Last updated: October 6, 2026

Detection coverage

Elastio detects Cerber inside your data and backups.

The Hunt Engine uses Deep File Inspection to identify Cerber 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.