Ransomware Research
Outsider Ransomware
Outsider is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on December 1, 2018, this ransomware has been actively targeting systems worldwide.
Quick Facts
- Ransomware Family
- Outsider
- First Seen
- December 1, 2018
How Outsider Ransomware Works
Targeted Files
https://app.any.run/tasks/5bb9f568-4826-4e7c-89d5-5051c20427d3/ https://app.any.run/tasks/fd28165b-c6ef-4693-827f-3d3de3cbf9e9/ https://www.bleepingcomputer.com/forums/t/702908/pls-help-sguard-encrypted-files-sguard-readmetxt/ https://www.bleepingcomputer.com/forums/t/716967/mbit-ransomware-help-needed/ https://tria.ge/200621-1sp71ylcqe/behavioral1
File Encryption Patterns
Outsider modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..protected..crypt..popotic1..popoticus..sguard..guarded..mapo..sivo..dante..mbit..gomer..edab..assistRansom Note and Payment Demands
After encrypting files, Outsider displays ransom notes demanding payment for file recovery:
HOW_TO_RESTORE_FILES.txtRansom message:
notes/HOW_TO_RESTORE_FILES.txt
RESTORE_FILES.txtRansom message:
notes/RESTORE_FILES.txt
Note locations:
EveryFolderHOW_TO_RESTORE_YOUR_FILES.txtRansom message:
notes/HOW_TO_RESTORE_YOUR_FILES.txt
Note locations:
EveryFolderSECURITY-ISSUE-INFO.txtRansom message:
notes/SECURITY-ISSUE-INFO.txt
HOW-TO-RESTORE-FILES.txtSGUARD-README.txtRansom message:
notes/SGUARD-README.txt
GUARDED-README.txtRansom message:
notes/GUARDED-README.txt
MAPO-Readme.txtRansom message:
notes/MAPO-Readme.txt
Note locations:
EveryFolderSivo-README.txtRansom message:
notes/Sivo-README.txt
Note locations:
EveryFolderDANTE-INFO.txtRansom message:
notes/DANTE-INFO.txt
MBIT-INFO.txtRansom message:
notes/MBIT-INFO.txt
GOMER-README.txtRansom message:
notes/GOMER-README.txt
Note locations:
EveryFolderEDAB-README.txtNote locations:
EveryFolderASSIST-README.txtRansom message:
notes/ASSIST-README.txt
Note locations:
EveryFolderTechnical Indicators
Associated Executable Files
The following executable files are associated with Outsider ransomware:
900.exeMSIE.exeTrojan.Ransom.Mapo.exeSivo.exeedab.exeassist.exeassist.bin
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About This Analysis
This Outsider 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 Outsider.
Last updated: July 30, 2025