Ransomware Research
05250lock Ransomware
05250lock is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on January 1, 2020, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: NuBe.
Quick Facts
- Ransomware Family
- 05250lock
- First Seen
- January 1, 2020
- Known Aliases
- NuBe
How 05250lock Ransomware Works
Targeted Files
filenames -> 13-Using_Powerpoint.ppt.dbcf AC203.mdb.id-5GXMG9G4.[grdoks@tutanota.com].zryyq
File Encryption Patterns
05250lock modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
./\.[a-z]{4,5}$/Ransom Note and Payment Demands
After encrypting files, 05250lock displays ransom notes demanding payment for file recovery:
/^[A-Z0-9]{8}-FILES ENCRYPTED\.txt$/Ransom message:
notes/5GXMG9G4-FILES ENCRYPTED.txt
Note locations:
EveryFolder/^CLICK_HERE-[a-z]{4,5}\.txt$/Ransom message:
notes/CLICK_HERE-dbcf.txt
Note locations:
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About This Analysis
This 05250lock 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 05250lock.
Last updated: July 30, 2025