hunting-for-dns-based-persistence▌
mukul975/Anthropic-Cybersecurity-Skills · updated May 25, 2026
MDX-style export adds YAML metadata + attribution linking explainx.ai and this canonical listing URL.
Hunt for DNS-based persistence mechanisms including DNS hijacking, dangling CNAME records, wildcard DNS abuse, and unauthorized zone modifications using passive DNS databases, SecurityTrails API, and DNS audit log analysis.
| name | hunting-for-dns-based-persistence |
| description | Hunt for DNS-based persistence mechanisms including DNS hijacking, dangling CNAME records, wildcard DNS abuse, and unauthorized zone modifications using passive DNS databases, SecurityTrails API, and DNS audit log analysis. |
| domain | cybersecurity |
| subdomain | threat-hunting |
| tags | - dns - persistence - threat-hunting - passive-dns - dns-hijacking - subdomain-takeover - securitytrails |
| version | '1.0' |
| author | mahipal |
| license | Apache-2.0 |
| nist_csf | - DE.CM-01 - DE.AE-02 - DE.AE-07 - ID.RA-05 |
Hunting for DNS-based Persistence
Overview
Attackers establish DNS-based persistence by hijacking DNS records, creating unauthorized subdomains, abusing wildcard DNS entries, or modifying NS delegations to redirect traffic through attacker-controlled infrastructure. These techniques survive credential rotations, endpoint reimaging, and traditional remediation because DNS changes persist independently of compromised hosts. Detection requires passive DNS historical analysis, zone file auditing, and monitoring for unauthorized record modifications. This skill covers hunting methodologies using SecurityTrails passive DNS API, DNS audit logs from Route53/Azure DNS/Cloudflare, and zone transfer analysis.
When to Use
- When investigating security incidents that require hunting for dns based persistence
- When building detection rules or threat hunting queries for this domain
- When SOC analysts need structured procedures for this analysis type
- When validating security monitoring coverage for related attack techniques
Prerequisites
- SecurityTrails API key (free tier provides 50 queries/month)
- Access to DNS provider audit logs (Route53, Azure DNS, Cloudflare, or on-premises DNS)
- Python 3.9+ with requests library
- DNS zone file access or AXFR capability for internal zones
- Historical DNS baseline for comparison
Steps
Step 1: Baseline DNS Records
Export current DNS zone records and establish baseline for all authorized A, AAAA, CNAME, MX, NS, and TXT records.
Step 2: Query Passive DNS History
Use SecurityTrails API to retrieve historical DNS records and identify unauthorized changes, new subdomains, and CNAME records pointing to decommissioned services (dangling CNAMEs).
Step 3: Detect Anomalies
Compare current records against baseline to identify unauthorized modifications, wildcard records that resolve all subdomains, NS delegation changes, and MX record hijacking.
Step 4: Investigate Findings
Correlate DNS anomalies with threat intelligence feeds, check resolution targets against known malicious infrastructure, and validate record ownership.
Expected Output
JSON report listing DNS anomalies with record type, historical changes, risk severity, and remediation recommendations for each finding.
How to use hunting-for-dns-based-persistence on Cursor
AI-first code editor with Composer
Prerequisites
Before installing skills in Cursor, ensure your development environment meets these requirements:
- ›Cursor installed and configured on your development machine
- ›Node.js version 16.0+ with npm package manager (verify with
node --version) - ›Active project directory or workspace where you want to add hunting-for-dns-based-persistence
Execute installation command
Execute the skills CLI command in your project's root directory to begin installation:
The skills CLI fetches hunting-for-dns-based-persistence from GitHub repository mukul975/Anthropic-Cybersecurity-Skills and configures it for Cursor.
Select Cursor when prompted
The CLI will show a list of available agents. Use arrow keys to navigate and space to select Cursor:
Verify installation
Confirm successful installation by checking the skill directory location:
Reload or restart Cursor to activate hunting-for-dns-based-persistence. Access the skill through slash commands (e.g., /hunting-for-dns-based-persistence) or your agent's skill management interface.
Security & Verification Notice
We perform automated surface-level scans (Gen AI Scanner, Socket, Snyk) during installation. These checks detect common vulnerabilities but do not guarantee complete security. Always review skill source code and verify the publisher's reputation before production use.
Skills execute code in your development environment. Always verify the publisher's identity, review recent commits, and test in isolated environments before production deployment.
List & Monetize Your Skill
Submit your Claude Code skill and start earning
Use Cases▌
Task Automation & Efficiency
Automate repetitive workflows and reduce manual effort
Example
Generate reports, summarize documents, draft communications
Save 3-5 hours per week on routine tasks
Knowledge Enhancement
Learn new skills, understand complex topics, get expert guidance
Example
Explain concepts, provide examples, suggest learning resources
Accelerate learning and skill development by 2x
Quality Improvement
Enhance output quality through reviews, suggestions, and refinements
Example
Review drafts, suggest improvements, catch errors
Improve work quality by 30-40% with less effort
Implementation Guide▌
Prerequisites
- ›Claude Desktop or compatible AI client with skill support
- ›Clear understanding of task or problem to solve
- ›Willingness to iterate and refine outputs
Time Estimate
15-45 minutes depending on use case complexity
Installation Steps
- 1.Install skill using provided installation command
- 2.Test with simple use case relevant to your work
- 3.Evaluate output quality and relevance
- 4.Iterate on prompts to improve results
- 5.Integrate into regular workflow if valuable
Common Pitfalls
- ⚠Expecting perfect results without iteration
- ⚠Not providing enough context in prompts
- ⚠Using skill for tasks outside its intended scope
- ⚠Accepting outputs without review and validation
Best Practices▌
✓ Do
- +Start with clear, specific prompts
- +Provide relevant context and constraints
- +Review and refine all outputs before using
- +Iterate to improve output quality
- +Document successful prompt patterns
✗ Don't
- −Don't use without understanding skill limitations
- −Don't skip validation of outputs
- −Don't share sensitive information in prompts
- −Don't expect skill to replace human judgment
💡 Pro Tips
- ★Be specific about desired format and style
- ★Ask for multiple options to choose from
- ★Request explanations to understand reasoning
- ★Combine AI efficiency with human expertise
When to Use This▌
✓ Use When
Use when skill capabilities match your task, clear ROI on time saved, and you can validate outputs. Best for repetitive tasks, learning, and quality improvement.
✗ Avoid When
Avoid when task requires deep expertise you can't validate, involves sensitive decisions, or when learning process is more valuable than speed of completion.
Learning Path▌
- 1Familiarize yourself with skill capabilities and limitations
- 2Start with low-risk, non-critical tasks
- 3Progress to more complex and valuable use cases
- 4Build expertise through regular use and experimentation
Discussion
Product Hunt–style comments (not star reviews)- No comments yet — start the thread.
Ratings
4.6★★★★★68 reviews- ★★★★★Shikha Mishra· Dec 24, 2024
hunting-for-dns-based-persistence is among the better-maintained entries we tried; worth keeping pinned for repeat workflows.
- ★★★★★Emma Bhatia· Dec 20, 2024
We added hunting-for-dns-based-persistence from the explainx registry; install was straightforward and the SKILL.md answered most questions upfront.
- ★★★★★William Menon· Dec 16, 2024
Solid pick for teams standardizing on skills: hunting-for-dns-based-persistence is focused, and the summary matches what you get after install.
- ★★★★★Emma Desai· Dec 12, 2024
Keeps context tight: hunting-for-dns-based-persistence is the kind of skill you can hand to a new teammate without a long onboarding doc.
- ★★★★★Ira Verma· Dec 8, 2024
hunting-for-dns-based-persistence fits our agent workflows well — practical, well scoped, and easy to wire into existing repos.
- ★★★★★Ira Johnson· Dec 4, 2024
Registry listing for hunting-for-dns-based-persistence matched our evaluation — installs cleanly and behaves as described in the markdown.
- ★★★★★Emma Haddad· Nov 27, 2024
Registry listing for hunting-for-dns-based-persistence matched our evaluation — installs cleanly and behaves as described in the markdown.
- ★★★★★Soo Ramirez· Nov 23, 2024
hunting-for-dns-based-persistence reduced setup friction for our internal harness; good balance of opinion and flexibility.
- ★★★★★Ishan Taylor· Nov 23, 2024
hunting-for-dns-based-persistence fits our agent workflows well — practical, well scoped, and easy to wire into existing repos.
- ★★★★★Emma Diallo· Nov 19, 2024
I recommend hunting-for-dns-based-persistence for anyone iterating fast on agent tooling; clear intent and a small, reviewable surface area.
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