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Incident response (IR) is a critical process in cybersecurity aimed at identifying, containing, and mitigating security incidents. Below is a structured approach to handling common cyberattacks, along with practical commands and steps.
You Should Know:
1. Initial Detection & Analysis
- Log Analysis: Use `grep` and `journalctl` to inspect logs.
grep "failed" /var/log/auth.log journalctl -u sshd --no-pager | grep "Failed password"
- Network Connections: Check active connections with `netstat` or
ss.netstat -tulnp ss -tuln
2. Containment
- Isolate Affected Systems: Disconnect from the network.
ifconfig eth0 down
- Block Malicious IPs: Use `iptables` or
ufw.iptables -A INPUT -s <malicious_ip> -j DROP ufw deny from <malicious_ip>
3. Eradication
- Kill Suspicious Processes:
ps aux | grep "malicious_process" kill -9 <PID>
- Remove Malicious Files:
find / -name "suspicious_file" -delete
4. Recovery
- Restore from Backup:
rsync -avz /backup/ /original/
- Patch Vulnerabilities:
apt update && apt upgrade -y
5. Post-Incident Review
- Generate a Report:
cat /var/log/syslog > incident_report.txt
What Undercode Say
Effective incident response requires a mix of proactive monitoring, quick containment, and thorough remediation. Below are additional commands to enhance your IR capabilities:
- Memory Analysis: Use `volatility` for forensic investigation.
- File Integrity Checks:
sha256sum critical_file
- Automated Alerts: Set up `fail2ban` for brute-force protection.
- Windows IR Commands:
tasklist /svc netstat -ano
- SIEM Integration: Forward logs to Splunk or ELK for real-time analysis.
Expected Output:
A well-documented incident report with timelines, affected systems, and remediation steps.
Related URLs (if applicable):
References:
Reported By: Priombiswas Ict – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
