This is Part 2 of our 4-part Incident Response & Containment series. If you missed Part 1, check it out here.
Once you’ve confirmed an incident, containment is the next immediate step. This phase is all about damage control — stopping the attack before it causes further harm.
Immediate vs. Long-Term Containment
- Immediate containment: Disconnect affected systems, disable accounts, isolate infected machines.
- Long-term containment: Set up temporary network segments, apply firewall rules, and monitor traffic.
Key Considerations
- Avoid tipping off the attacker, especially in advanced persistent threat (APT) situations.
- Maintain detailed logs of all actions.
- Coordinate across teams: IT, security, communications, and management.
Communication Protocols
- Internal: Notify relevant teams with clear, concise updates.
- External: If needed, coordinate legal/compliance before speaking to media or customers.
Role of SOCs and Blue Teams
- Monitoring alerts and escalating incidents.
- Initiating containment measures quickly.
- Providing forensic snapshots for investigation.
OT vs. IT Containment
- In Operational Technology (OT), containment must be done with minimal disruption to physical operations.
- IT environments allow more flexibility in isolation and shutdown procedures.
Example: A company detected a worm spreading internally. Quick segmentation of the network and disabling of lateral movement prevented a company-wide shutdown.
Conclusion
Smart containment is where you draw the line between a small breach and a full-blown crisis. Getting it right means you’re buying time to understand the threat and take control of the situation. Next up in Part 3: how to remove the threat completely and prevent it from coming back.
An Ask
I invite you to share your thoughts, memories, or even your own experiences in the comments below. Your feedback and support will be invaluable in shaping this narrative, and I look forward to continuing this adventure together. Thank you !
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LinkedIn: Syed-Adil Hussain
Email@: thecyberguy90@gmail.com
Feel free to reach out to me in English, German, Urdu, or Hindi—I’m fluent in all four languages. Whether you have questions, want to share your own experiences, or just fancy a friendly conversation, I’m here! Your thoughts and insights are always welcome.
