Ransomware Research

CryptoShield 1.0 Ransomware

CryptoShield 1.0 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

Ransomware Family
CryptoShield 1.0
First Seen
February 1, 2017

How CryptoShield 1.0 Ransomware Works

File Encryption Patterns

CryptoShield 1.0 modifies encrypted files using specific patterns to mark them as encrypted:

File extensions added after encryption:

..CRYPTOSHIELD

Ransom Note and Payment Demands

After encrypting files, CryptoShield 1.0 displays ransom notes demanding payment for file recovery:

file# RESTORING FILES #.TXT

Ransom message:

notes/# RESTORING FILES #.TXT

Note locations:

EveryFolder
file# RESTORING FILES #.HTML

Ransom message:

notes/# RESTORING FILES #.HTML

Note locations:

EveryFolder

Technical Indicators

Associated Executable Files

The following executable files are associated with CryptoShield 1.0 ransomware:

  • winlogon.exe
  • Windows Winlog
  • cryptoshield.exe
  • da98d21ebd555c4b_rada5971.tmp.exe
  • e71.exe
  • CryptoShield.exe
  • test1
  • ScreenSmarts
  • 2b78c994f2daabfd_rad6411a.tmp.exe
  • Windows Winlog SoftWare
  • jquery.exe
  • SmartScreen.exe
  • 邀请函(请只在虚拟机运行).exe
  • cs01.exe

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About This Analysis

This CryptoShield 1.0 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 CryptoShield 1.0.

Last updated: October 30, 2025

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