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
Targeted Files
ATOMSILO-README.hta template message in /mnt/Users/Public/; Stripes encryption by 16 bytes
File Encryption Patterns
AtomSilo modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..ATOMSILORansom Note and Payment Demands
After encrypting files, AtomSilo displays ransom notes demanding payment for file recovery:
README-FILE-{VICTIM_PC_NAME}-{TIMESTAMP}.htaRansom message:
notes/README-FILE-DESKTOP-NVLERB1-1661424673.hta
Note locations:
EveryFolderTechnical Indicators
Associated Executable Files
The following executable files are associated with AtomSilo ransomware:
ATOMSILO_2.exeupdate.exepri.exe_
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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: July 30, 2025