fileHOW_TO_RECOVER_MY_FILES.txt
notes/HOW_TO_RECOVER_MY_FILES.txt
Location: EveryFolder
Ransomware Research
Karasawa Ransomware
Karasawa is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on January 1, 2026, this ransomware has been actively targeting systems worldwide.
Quick facts
- Ransomware Family
- Karasawa
- First Seen
- January 1, 2026
How Karasawa ransomware works
File modification behavior
Karasawa updates file modification timestamps after encryption.
File encryption patterns
Karasawa modifies encrypted files using specific patterns to mark them as encrypted:
Extensions added after encryption
- .krsw
Ransom note and payment demands
After encrypting files, Karasawa displays ransom notes demanding payment for file recovery:
Technical indicators
Associated executable files
The following executable files are associated with Karasawa ransomware:
- app.exe
About this analysis
This Karasawa 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 Karasawa.
Detection coverage
Elastio detects Karasawa inside your data and backups.
The Hunt Engine uses Deep File Inspection to identify Karasawa across live data, replicated data, and backups. If this family is in your environment, Elastio finds it before encryption completes. Run a hunt against your recovery points to confirm.