Ransomware Research
DoNotOpen Ransomware
DoNotOpen is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on January 1, 2017, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: DN.
Quick Facts
- Ransomware Family
- DoNotOpen
- First Seen
- January 1, 2017
- Known Aliases
- DN
How DoNotOpen Ransomware Works
File Encryption Patterns
DoNotOpen modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..killedXXXRansom Note and Payment Demands
After encrypting files, DoNotOpen displays ransom notes demanding payment for file recovery:
Ransom message:
notes/note.txt
Note locations:
OnceOnCompletionTechnical Indicators
Associated Executable Files
The following executable files are associated with DoNotOpen ransomware:
Chrome Update.exe
Elastio Can Help You
Don't let DoNotOpen ransomware take over your data
Elastio provides advanced ransomware protection and recovery solutions to keep your organization safe.
About This Analysis
This DoNotOpen ransomware analysis is part of Elastio's comprehensive ransomware detection database. Elastio provides advanced ransomware protection and recovery solutions, helping organizations defend against and recover from ransomware attacks like DoNotOpen.
Last updated: July 30, 2025