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Christopher Nett

@christophernett.com

81 followers 44 following 1.3K posts

Hey there! 👋 I'm Christopher, a Security Architect at Microsoft and Udemy Instructor Partner. I focus on Cybersecurity, Azure and DevOps. https://linktr.ee/christophernett https://www.christophernett.com/impressum/

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Christopher Nett @christophernett.com · 18d

Hey folks! This month, you can get each of my Udemy courses for just $12.99 with the code OCTOBER2025! 🎉

Choose from courses like:
💎 Microsoft Sentinel
💎 Microsoft Defender XDR
💎 AI Security
💎 And more on Azure, Cybersecurity and AI!

👉 https://www.christophernett.com/courses/

Christopher Nett @christophernett.com · 15m

Defend Against Ransomware
🛡️ Backup critical files regularly
🛡️ Use endpoint protection tools
🛡️ Block unauthorized apps
🛡️ Monitor for unusual file activity
🛡️ Educate teams on phishing threats
#cybersecurity

Christopher Nett @christophernett.com · 8h

Infrastructure as Code:
📂 Automate infrastructure deployment with ARM.
📂 Use parameters for reusable templates.
📂 Validate templates before deployment.
📂 Monitor deployments with logs.
📂 Integrate with CI/CD pipelines for automation.

Code your infrastructure! 🛠️ #Azure

Christopher Nett @christophernett.com · 15h

Cybersecurity for Developers:
💻 Follow secure coding practices like OWASP
💻 Use static and dynamic code analysis tools
💻 Sanitize user inputs to prevent injection attacks
💻 Protect APIs with strong authentication
💻 Conduct regular security reviews

Build secure! 🚀 #cybersecurity

Christopher Nett @christophernett.com · 1d

Cyber Threat Intelligence Lifecycle
1️⃣ Collection: Gather threat data
2️⃣ Processing: Filter and structure raw data
3️⃣ Analysis: Derive insights and actionable intelligence
4️⃣ Dissemination: Share findings
5️⃣ Feedback: Continuously refine the process

Turn data into actionable insights! 🔍 #CTI

Christopher Nett @christophernett.com · 1d

Container Security
🐳 Scan container images for vulnerabilities during builds.
🐳 Use secure base images from trusted registries.
🐳 Avoid running containers with root privileges.
🐳 Monitor runtime containers for drift.
🐳 Apply least privilege access.

Container Security! 🔐 #devsecops

Christopher Nett @christophernett.com · 1d

ATT&CK Relations:
✅ Tactics: The “why” of an attack (e.g., persistence, exfiltration).
✅ Techniques: The “how” (e.g., spear phishing, lateral movement).
✅ Sub-Techniques: The "how2". Granular details of techniques.
✅ Groups: Profiles of threat actor behavior.
🔐 #MITREATTACK

Christopher Nett @christophernett.com · 2d

Address Shadow IT Risks
💻 Discover unapproved tools and apps with CASB or scanning
💻 Monitor network activity for unusual usage patterns
💻 Educate employees on risks of unapproved software
💻 Integrate security into the procurement process

Shine a light on shadow IT! 🔦 #cybersecurity

Christopher Nett @christophernett.com · 2d

🔥Threat Modeling with PASTA🔥

The 7 Stages of PASTA:
1️⃣ Define Objectives
2️⃣ Define Tech Scope
3️⃣ Decompose App
4️⃣ Threat Analysis
5️⃣ Vulnerability Analysis
6️⃣ Attack Analysis
7️⃣ Risk and Impact Analysis

#PASTA

Christopher Nett @christophernett.com · 3d

Govern Azure Resources with Policies:
✅ Enforce naming conventions
✅ Restrict regions for deployments
✅ Enable compliance audits
✅ Use initiative definitions for bundled policies
✅ Monitor compliance with dashboards

Stay in control! 📋 #azure

Christopher Nett @christophernett.com · 3d

🔥 Threat Modeling with STRIDE 🔥

STRIDE helps identify and mitigate security threats during system design. It categorizes threats into six types:

1️⃣ Spoofing
2️⃣ Tampering
3️⃣ Repudiation
4️⃣ Info Disclosure
5️⃣ DoS
6️⃣ Elevation of Privilege

#STRIDE

Christopher Nett @christophernett.com · 4d

🔥 MITRE ATLAS 🔥

MITRE ATLAS is focused on adversary tactics targeting AI systems.

👉 Tactics & Techniques: Covers e.g. data poisoning, evasion, and model exploits.
👉 Case Studies: Real-world examples of attacks and mitigations.
🔗 atlas.mitre.org https://atlas.mitre.org/matrices/ATLAS

Christopher Nett @christophernett.com · 4d

Go Passwordless with Entra ID:
🔐 Enable biometrics like Windows Hello
🔐 Use FIDO2 security keys
🔐 Implement Microsoft Authenticator
🔐 Improve user experience with passwordless SSO
🔐 Monitor adoption rates

Goodbye passwords! 🚀 #azure

Christopher Nett @christophernett.com · 4d

🔥 Lockheed Martin Cyber Kill Chain 🔥

1️⃣ Recon: Research targets.
2️⃣ Weaponize: Create payloads.
3️⃣ Delivery: Deliver via phishing, exploits.
4️⃣ Exploit: Execute on victim systems.
5️⃣ Install: Establish persistence.
6️⃣ C2: Communicate with attacker infrastructure.
7️⃣Objectives: Steal data or disrupt.

Christopher Nett @christophernett.com · 5d

Fortify Azure networks!
🌐 Use NSGs & ASGs
🌐 Enable Azure DDoS Protection
🌐 Deploy Azure Firewall
🌐 Restrict public access with private endpoints
🌐 Monitor traffic with VNet flow logs

Keep threats out! 🛡️ #azure

Christopher Nett @christophernett.com · 5d

🔎 SIGMA Rules 🔎

SIGMA is a universal detection rule format for cybersecurity teams.

Key Components:
1️⃣ Sigma Format: Standard for detection rules.
2️⃣ Sigma Tools: Manage and deploy rules.
3️⃣ Sigma Rule Collections: Share and reuse across platforms.

🔗 sigmahq.io/docs

Christopher Nett @christophernett.com · 6d

Entra ID Best Practices:
🔐 Implement Conditional Access Policies
🔐 Use Identity Protection for risk insights
🔐 Enable Privileged Identity Management (PIM)
🔐 Restrict legacy authentication methods
🔐 Audit log-ins for anomalies

Secure access! 🚀 #azure

Christopher Nett @christophernett.com · 6d

‘‘Intrusion analysis is as much about tcpdump as astronomy is about
telescopes"

Diamond Model of Intrusion Analysis: https://apps.dtic.mil/sti/pdfs/ADA586960.pdf
#cybersecurity

Christopher Nett @christophernett.com · 6d

YARA helps malware researchers identify and classify malware via rules. Use cases:
👉 Malware Analysis: Detect malware families.
👉 Threat Hunting: Scan files or traffic for threats.
👉 Monitoring: Integrate with SIEM/EDR.
🔗 yara.readthedocs.io

#yara

Christopher Nett @christophernett.com · 7d

Enhance Security with Entra ID
🔒 Block risky sign-ins
🔒 Monitor sign-in patterns for anomalies
🔒 Use Identity Protection for risk-based policies
🔒 Enable passwordless authentication
🔒 Restrict legacy authentication methods
Smarter identity management! 🚀 #entraID

Christopher Nett @christophernett.com · 7d

What is the Traffic Light Protocol (TLP)?
🚦TLP is a system for sharing sensitive information securely.
🚦Uses color-coded labels to communicate sharing rules.
🚦Designed for cyber threat intelligence sharing.

Share responsibly! 🚦 #TrafficLightProtocol

Christopher Nett @christophernett.com · 8d

Combat Distributed Denial of Service (DDoS) Attacks
🌐 Use a DDoS protection service for mitigation
🌐 Monitor traffic for abnormal spikes
🌐 Distribute workloads across multiple servers
🌐 Enable rate-limiting to prevent abuse

#cybersecurity

Christopher Nett @christophernett.com · 8d

What is the Pyramid of Pain?
🔺 It illustrates the difficulty attackers face when defenders disrupt different IoCs (Indicators of Compromise).
🔺 From easily replaceable items like hash values to hard-to-change adversary TTPs (Tactics, Techniques, Procedures).

Christopher Nett @christophernett.com · 8d

The Digital Forensics Process
1️⃣ Identification: Locate evidence.
2️⃣ Preservation: Ensure data integrity and prevent tampering.
3️⃣ Analysis: Extract and interpret information.
4️⃣ Documentation: Record findings systematically.
5️⃣ Presentation: Share evidence with stakeholders.

🔍 #DigitalForensics

Christopher Nett @christophernett.com · 9d

Strengthen Your Endpoint Defense
🖥️ Deploy EDR
🖥️ Harden your endpoints with benchmarks like CIS
🖥️ Identify and remediate vulnerabilities
🖥️ Leverage auto-remediation for common issues

Secure endpoints! #cybersecurity

Christopher Nett @christophernett.com · 10d

Enhance Azure VM Security:
🖥️ Enable Defender for Servers
🖥️ Use Just-In-Time (JIT) VM access
🖥️ Encrypt disks with Azure Disk Encryption
🖥️ Patch with Update Management
🖥️ Monitor with Sentinel

Secure your workloads! 🔐 #azure