LambdaLocker Ransomware
LambdaLocker is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on February 1, 2017, this ransomware has been actively targeting systems worldwide.
Quick facts
How LambdaLocker ransomware works
File encryption patterns
LambdaLocker modifies encrypted files using specific patterns to mark them as encrypted:
Ransom note and payment demands
After encrypting files, LambdaLocker displays ransom notes demanding payment for file recovery:
notes/!UNLOCK_guiDE.tXT
notes/READ_IT.hTmL
notes/#Cyb3rGh0st_S0c13tyF@ck3r
notes/!A_NOTICE_FROM_LAST
Technical indicators
Associated executable files
The following executable files are associated with LambdaLocker ransomware:
- RS_LambdaLocker.exe
- reloader.exe
- LambdaLocker.exe
- baiduyunSimple.exe
- baiduyunSimple（ransomware）.exe
- kukuvruku.exe
- ransomware Python LambdaLocker
- ooo
- ruku_v_kuku_.exe
- 1-6.exe
- jkv.exe
- ruku_v_kuku
- Ransomware_Decryptor.exe
- cracker.exe
- VortexVPN.exe
- VortexVPN.vir.DNvir
- VORTEXVPN.EXE
- systern.exe
Recovery and decryption tools
Decryption tools may be available for LambdaLocker. Review the resources below:
About this analysis
This LambdaLocker 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 LambdaLocker.
Last updated: December 30, 2025
Elastio detects LambdaLocker inside your data and backups.
The Hunt Engine uses Deep File Inspection to identify LambdaLocker across live data, replicated data, and backups. If this family is in your environment, Elastio finds it before encryption completes. Run a scan against your recovery points to confirm.
Recent ransomware
Explore other threats in our database