Ransomware Research
Lambda Ransomware
Lambda is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on October 1, 2023, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: LambdaCrypter.
Quick Facts
- Ransomware Family
- Lambda
- First Seen
- October 1, 2023
- Known Aliases
- LambdaCrypter
How Lambda Ransomware Works
Targeted Files
https://tria.ge/231006-v5r4ssgg74
File Encryption Patterns
Lambda modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..LambdaRansom Note and Payment Demands
After encrypting files, Lambda displays ransom notes demanding payment for file recovery:
LAMBDA_README.txtRansom message:
notes/LAMBDA_README.txt
Note locations:
EveryFolderTechnical Indicators
Associated Executable Files
The following executable files are associated with Lambda ransomware:
LambdaCrypter.exe
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About This Analysis
This Lambda 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 Lambda.
Last updated: July 30, 2025