# Recovering From Ransomware Attack

> Use when executing structured recovery from a ransomware incident following NIST and CISA frameworks, including environment isolation, forensic evidence preservation, clean infrastructure rebuild, prioritized system restoration from verified backups, credential reset, and validation against re-infection. Covers Active Directory recovery, database restoration, and application stack rebuild in dependency order.

- Skill: `oyi77/recovering-from-ransomware-attack` (Agent Skill)
- Install (CLI): `npx skillmds add oyi77/recovering-from-ransomware-attack`
- Raw SKILL.md: https://api.skillmd.com/api/skills/oyi77/recovering-from-ransomware-attack/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- License: Apache-2.0
- Author: oyi77 (https://skillmd.com/u/oyi77)
- Updated: 2026-09-08
- Page: https://skillmd.com/skills/oyi77/recovering-from-ransomware-attack

---


# Recovering From Ransomware Attack

## Overview

Cybersecurity skill for recovering from ransomware attack. Follows industry best practices and security standards.

## When to Use
**Trigger phrases:**
- "recovering from ransomware attack"
- "Executes structured recovery from a ransomware incident following NIST and CISA "


- After ransomware has encrypted production systems and the decision has been made to recover from backups
- When building or validating a ransomware recovery runbook before an actual incident
- After receiving a decryption key (paid ransom or law enforcement provided) and needing to safely decrypt
- When partial recovery is needed alongside decryption of remaining systems
- Conducting a recovery drill to validate RTO commitments

**Do not use** before completing containment and forensic scoping. Premature recovery without understanding the attacker's access and persistence mechanisms risks re-infection.


## 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

- Incident declared and containment phase completed (all attacker access severed)
- Forensic evidence preserved (disk images, memory dumps, network captures)
- Backup integrity verified (immutable/air-gapped copies confirmed clean)
- Clean build media available (OS installation media, golden images)
- Recovery environment prepared (clean network segment isolated from compromised infrastructure)
- Recovery priority list documented (Tier 1/2/3 systems in dependency order)

## Workflow

```python
# 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": r"\b[a-f0-9]{64}\b",
}

def extract_iocs(text: str) -> dict:
    return {k: re.findall(v, text) for k, v in IOC_PATTERNS.items()}
```

1. **Define Objectives** — Clarify the goals and scope for from ransomware attack.
2. **Gather Resources** — Collect tools, data, and access needed for from ransomware attack.
3. **Execute Process** — Carry out from ransomware attack operations methodically.
4. **Verify Quality** — Check results against acceptance criteria.
5. **Document Outcomes** — Record findings, decisions, and next steps.

## Tools

- **Analysis Platform** — Data processing and visualization
- **Collaboration Tools** — Team coordination and knowledge sharing


## Process

1. **Reconnaissance** — Gather target information, identify attack surface, enumerate services
1. **Analysis/Exploitation** — Execute the technique, analyze results, document findings
1. **Reporting** — Document IOCs, write findings, provide remediation recommendations

## Verification

- [ ] All from ransomware attack procedures executed completely and documented
- [ ] Findings validated against multiple data sources
- [ ] False positives identified and filtered
- [ ] Results documented with evidence and timestamps
- [ ] Recommendations provided with risk-based prioritization

## Anti-Rationalization Table

| Rationalization | Reality |
|---|---|
| "We are too small to be targeted" | Automated attacks target everyone. Size does not matter. |
| "Security slows us down" | A breach slows you down 100x more. Build security in from the start. |
| "We will fix it after launch" | Vulnerabilities in production are exploited within hours. Fix before deploy. |