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Ransomware Research
AtomSilo Ransomware
AtomSilo is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on September 1, 2021, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: AtomSlio.
Quick Facts
- Ransomware Family
- AtomSilo
- First Seen
- September 1, 2021
- Known Aliases
- AtomSlio
How AtomSilo Ransomware Works
File Encryption Patterns
AtomSilo modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..ATOMSILO
Ransom Note and Payment Demands
After encrypting files, AtomSilo displays ransom notes demanding payment for file recovery:
README-FILE-{VICTIM_PC_NAME}-{TIMESTAMP}.hta
Ransom message:
notes/README-FILE-DESKTOP-NVLERB1-1661424673.hta
Note locations:
EveryFolder
Technical Indicators
Associated Executable Files
The following executable files are associated with AtomSilo ransomware:
ATOMSILO_2.exe
update.exe
pri.exe_
Elastio Can Help You
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About This Analysis
This AtomSilo 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 AtomSilo.
Last updated: September 30, 2025
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