Ransomware Research
Locdoor Ransomware
Locdoor is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on September 1, 2018, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: DryCry.
Quick Facts
- Ransomware Family
- Locdoor
- First Seen
- September 1, 2018
- Known Aliases
- DryCry
How Locdoor Ransomware Works
Targeted Files
Fake (only renames) Replaces original extension
File Encryption Patterns
Locdoor modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
./\.door\d{1,2}$/Ransom Note and Payment Demands
After encrypting files, Locdoor displays ransom notes demanding payment for file recovery:
Help!_HowRansom message:
notes/Help!_How
Note locations:
RansomPayloadStartFolderNotice_readme_English.txtRansom message:
notes/Notice_readme_English.txt
Note locations:
RansomPayloadStartFolderNotice_readme_╟╤▒╣╛ε.txtRansom message:
notes/Notice_readme_╟╤▒╣╛ε.txt
Note locations:
RansomPayloadStartFolderNotice_readme_∞φ▄Γ.txtRansom message:
notes/Notice_readme_∞φ▄Γ.txt
Note locations:
RansomPayloadStartFolderTechnical Indicators
Associated Executable Files
The following executable files are associated with Locdoor ransomware:
source.exe
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About This Analysis
This Locdoor 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 Locdoor.
Last updated: July 30, 2025