Windows & PowerShell Commands — Essential Guide for Cybersecurity Professionals, Okan YILDIZ, 2025

🔹 Core Windows CLI for Security Operations
– Event log inspection (wevutil, eventvwr, Get-WinEvent)
– User/session visibility & live investigation commands
– Process, service, and network analysis essentials
– File system auditing & permission review techniques

🔹 PowerShell for DFIR & Threat Hunting
– Deep system enumeration (Get-Process, Get-Service, Get-LocalUser, CIM/WMI queries)
– Network reconnaissance & live traffic monitoring
– Registry interrogation for persistence & malware indicators
– Collecting artifacts for IR workflows

🔹 Active Directory & Identity Insights
– AD object queries & user/group enumeration
– Privilege escalation visibility
– Sessions, logons, access rights & trust relationship checks

🔹 Incident Response Foundations
– Quick triage commands
– Host compromise validation
– Lateral movement indicators
– Privileged access and credential abuse checks

🔹 Red Team & Blue Team Utility Commands
– Recon & enumeration shortcuts
– Script execution policies
– Command-line defense evasion insights (for defenders to detect)

#windows #audit #coding

JWT Security – Complete Enterprise Implementation for Modern Apps 🛡

🔐 JWT Architecture & Design
• Header, payload, signature internals
• Secure use of alg, kid, and claim design
• Stateless vs session-based auth from a security lens

💣 Real-World Vulnerabilities
• Algorithm confusion (none, RS256→HS256) with full exploit + fix
• Key management pitfalls (weak secrets, kid path-traversal, JWKS abuse)
• Token storage risks (localStorage, extensions, XSS, supply-chain issues)

🧬 Secure Implementation Blueprint
• End-to-end JWT lifecycle: auth → issuance → storage → usage → refresh → revocation
• Device binding, replay detection, anomaly detection & rate limiting
• Production-ready JWT service with Redis, logging, metrics & audit trails

🛠 Code You Can Drop Into Your Stack
• Python & Node-style examples
• Secure header/payload builders
• Signature verification pipelines with strict algorithm whitelisting
• Key rotation strategy with kid and overlapping keys

#AppSec

Deep-Dive Drop: Dev(sec)Ops Process for Dummies 🐜⚙️

Most teams ship code to production in minutes… and trust a few YAML lines not to burn the house down

In this guide, I break down how one missing security gate in a CI/CD pipeline led to a 47-minute attack and $4M+ in damage—and how to redesign your processes so it never happens again.

🔍 The 3:47 AM Incident
• Step-by-step timeline from alert → triage → forensics → root cause
• How a “hotfix” branch, skipped scans, and an expired token led to full domain compromise

🏗 Secure vs Insecure DevOps Patterns
• Manual approval gates, shared service accounts, static tokens, no baselines
• Secure alternatives: immutable workflows, environment-specific gates, anomaly detection, auto-rollback, ephemeral creds

🧩 8 Core Processes Across the SDLC
• Vulnerability scanning (SAST/SCA/DAST/Cloud/IaC)
• CI/CD pipeline security and workflow hardening
• Infrastructure change management (Terraform / K8s / cloud)
• Container security & image signing
• Dynamic secret rotation and short-lived credentials
• Incident response flow, KPIs, and RACI for each process

📊 Real KPIs, Not Theory
• MTTR for critical vulns, deployment & rollback SLAs
• Secret age, rotation success rate, baseline vs anomaly metrics
• Velocity-first vs security-first cost curves over time

#SecDevOps

💻 Linux Server Configuration The Hidden Skill That Separates Junior Engineers from Real Engineers

In cybersecurity and DevSecOps, people talk a lot about cloud, AI, orchestration, Kubernetes… But very few talk about the backbone behind every secure infrastructure: 👉 Linux system administration.

This guide covers fundamentals that every modern engineer should master:
🔹 bash fundamentals
🔹 filesystem management (mount/umount, fstab)
🔹 file permissions (chmod, chown, sticky bits, setgid)
🔹 system processes (ps, top, pstree, signals)
🔹 package management (apt, rpm, bin installers)
🔹 NFS, Samba, DNS, DHCP, FTP
🔹 Apache2, MySQL, Postfix
🔹 Archiving & compression (tar, gzip, bzip2)

Whether you're a penetration tester, DevOps engineer, security architect, or backend developer Linux is your operating theater. If you don’t understand it deeply, you can’t secure it deeply.

#linux

Mastering the Foundations of Cyber Security – SOC Analyst Notes

Tools like SIEM and EDR were another major highlight. SIEM platforms collect and analyze logs, helping us detect incidents in real time, while EDR solutions safeguard endpoints with next-generation detection, prevention, and response capabilities. Understanding how these tools process alerts, parse logs, and correlate suspicious behavior is crucial for efficient incident handling.

Deep-diving into the OSI Layers gave me more clarity on how attackers exploit different layers — from web attacks at Layer 7 to ARP spoofing at Layer 2 or ICMP flooding at Layer 3. The document explained these layers beautifully, helping me connect protocols like HTTP/HTTPS, SSH, DNS, RDP, TCP/UDP with real-world attack scenarios.

#defensive