deploying-decoy-files-for-ransomware-detection

name	deploying-decoy-files-for-ransomware-detection
description	Use when deploys canary files (honeytokens) across file systems to detect ransomware encryption activity in real time. Uses strategically placed decoy documents monitored via file integrity monitoring or OS-level watchdogs to trigger alerts when ransomware modifies or encrypts them. Activates for requests involving ransomware canary deployment, honeyfile setup, deception-based ransomware detection, or file integrity monitoring for encryption. '.
domain	cybersecurity
tags	["ransomware","detection","canary-files","honeytokens","deception","file-integrity"]
subdomain	ransomware-defense
version	1.0.0
author	oyi77
license	Apache-2.0
nist_csf	["PR.DS-11","RS.MA-01","RC.RP-01","PR.IR-01"]

Deploying Decoy Files For Ransomware Detection

Overview

Cybersecurity skill for deploying decoy files for ransomware detection. Follows industry best practices and security standards.

When to Use

Trigger phrases:

• "deploying decoy files for ransomware detection"

• "Use when working with deploying decoy files for ransomware detection"

• Setting up early-warning detection for ransomware on file servers or endpoints

• Supplementing EDR/AV with a deception-based detection layer that catches unknown ransomware variants

• Creating high-fidelity ransomware alerts that have very low false-positive rates (legitimate users have no reason to touch decoy files)

• Testing ransomware response procedures by validating that canary file modifications trigger the expected alerting pipeline

• Protecting high-value file shares (finance, HR, legal) with tripwire files that indicate unauthorized encryption activity

Do not use decoy files as the sole ransomware defense. They are a detection mechanism, not a prevention mechanism, and should complement backups, EDR, and access controls.

When NOT to Use

• When you lack proper authorization for testing
• For production systems without change management
• When the task requires legal or compliance expertise beyond technical scope

Prerequisites

• Python 3.8+ with watchdog library for cross-platform file system monitoring
• Administrative access to target file shares or endpoints for canary placement
• File integrity monitoring (FIM) tool or SIEM integration for alert routing
• Understanding of target directory structure to place canaries in high-value locations
• Windows: NTFS change journal or ReadDirectoryChangesW API access
• Linux: inotify support in kernel (standard in modern kernels)

Workflow

# Example: IOC detection
import re

IOC_PATTERNS = {
    "ip": r"\b(?:\d{1,3}\.){3}\d{1,3}\b",
    "domain": r"\b[a-z0-9-]+\.[a-z]{2,}\b",
    "hash_md5": r"\b[a-f0-9]{32}\b",
    "hash_sha256": ,
}

 () -> :
     {k: re.findall(v, text)  k, v  IOC_PATTERNS.items()}