Listen to this Post
Introduction:
The path to becoming a SOC Analyst is often misrepresented as a quick, certification-driven journey. In reality, it demands a significant, sustained investment in hands-on technical practice and deep conceptual understanding. This guide cuts through the noise, providing the essential command-line skills and practical exercises needed to build the foundational expertise that SOC teams truly require.
Learning Objectives:
- Master fundamental Linux and Windows command-line utilities critical for security monitoring and incident response.
- Develop proficiency in analyzing network traffic, processes, and logs to identify malicious activity.
- Acquire hands-on experience with core security tools and methodologies used in modern Security Operations Centers.
You Should Know:
1. Linux System Interrogation for Triage
When a potential incident is flagged, a SOC analyst’s first step is often triaging a Linux endpoint. The following commands provide a snapshot of system state.
Process and Network Examination ps aux --sort=-%mem | head -10 List top 10 processes by memory usage ss -tulnpan | grep LISTEN Display all listening sockets and associated processes lsof -i :443 List processes using port 443 (or any suspect port) netstat -antp Alternative: Display all network connections and protocols who -a && last -10 Show current and recent logins find / -name ".sh" -perm /u=x 2>/dev/null Find all executable shell scripts crontab -l List current user's cron jobs sudo ls -la /etc/cron. List system-wide cron directories
Step-by-step guide: Begin by running `ps aux` to get a baseline of all running processes. Sort by memory (--sort=-%mem) to identify potential resource-heavy malware. Concurrently, use `ss -tulnpan` to map listening ports back to specific process IDs (PIDs). Cross-reference unexpected listening ports with the process list. The `lsof` command can then drill down into a specific port or process. Always check for unauthorized user access with `who` and last, and scour for unauthorized persistence mechanisms like cron jobs and rogue scripts.
2. Windows Forensic Artefact Collection
Windows environments require a different toolset. PowerShell is indispensable for collecting critical forensic artefacts from a potentially compromised host.
Network and Process Enumeration
Get-NetTCPConnection | Where-Object {$<em>.State -eq "Listen"} Get listening ports
Get-Process | Sort-Object WS -Descending | Select-Object -First 10 Top processes by Working Set (memory)
Get-WinEvent -LogName Security -MaxEvents 20 | Where-Object {$</em>.ID -eq 4624} Recent successful logins
Get-WmiObject -Class Win32_StartupCommand | Select-Object Name, command, Location Startup programs
netstat -ano | findstr LISTENING Classic netstat to find listening ports and PIDs
tasklist /svc | findstr <PID> Find services hosted by a specific process ID
schtasks /query /fo LIST /v List all scheduled tasks in detail
Step-by-step guide: Start by identifying suspicious network listeners using Get-NetTCPConnection. Note the owning PID and use `Get-Process` to identify the associated executable. To investigate persistence, use `schtasks` to query all scheduled tasks and `Get-WmiObject` for startup commands. For user activity analysis, filter the Security event log for Event ID 4624 (successful logon events) using Get-WinEvent. Correlate these findings with process creation logs (typically Event ID 4688) to build an attack timeline.
3. Packet Analysis with TShark
Network packet analysis is a core SOC skill. TShark, the command-line version of Wireshark, allows for powerful, scriptable traffic inspection.
Basic Traffic Filtering and Analysis tshark -r capture.pcap -Y "http.request" -T fields -e frame.time -e ip.src -e ip.dst -e http.host -e http.request.uri tshark -r capture.pcap -Y "dns.qry.name contains 'malicious'" Filter DNS queries for a known-bad domain tshark -r capture.pcap -Y "tcp.port == 445" -w smb_traffic.pcap Extract all SMB traffic to a new file tshark -r capture.pcap -q -z conv,tcp Generate TCP conversation statistics tshark -r capture.pcap -Y "tcp.flags.syn==1 && tcp.flags.ack==0" Display all SYN packets (new connections) tshark -i eth0 -f "host 8.8.8.8" -w google_dns.pcap Capture live traffic to/from a specific host
Step-by-step guide: To analyze a packet capture for web-based threats, use the first command to extract all HTTP requests, showing the timestamp, source, destination, host, and URI. This can quickly identify beaconing to command-and-control servers. For internal reconnaissance detection, filter on SMB traffic (port 445) and examine for patterns indicative of lateral movement. The `-z conv,tcp` option is invaluable for spotting unusual data transfer volumes between hosts, which could signal data exfiltration.
4. Log Analysis with Grep and JQ
A SOC analyst spends a considerable amount of time in logs. Mastering `grep` for text logs and `jq` for structured JSON logs is non-negotiable.
Text and JSON Log Parsing
grep -i "failed" /var/log/auth.log | head -100 Search for failed login attempts
grep -E "([0-9]{1,3}.){3}[0-9]{1,3}" logfile | awk '{print $NF}' | sort | uniq -c | sort -rn Extract and count unique IPs
cat cloudtrail.json | jq '.Records[] | select(.eventName == "DeleteBucket")' Find specific AWS API calls
cat json_log.json | jq '. | {timestamp: .timestamp, user: .user, action: .action}' Extract specific fields from JSON
journalctl --since "1 hour ago" | grep -C 3 "error" Search systemd journal for errors from the last hour
tail -f /var/log/nginx/access.log | grep --line-buffered "500" Follow a web log in real-time for 500 errors
Step-by-step guide: When investigating a brute-force attack, `grep` the authentication logs for “failed” password attempts and pipe the output to extract IP addresses, then count and sort them to identify the source of the attack. For cloud environments, logs are often JSON. Use `jq` to parse massive CloudTrail or Azure Activity logs, filtering for high-risk events like `DeleteBucket` or RunInstances. The real-time monitoring command with `tail -f` is crucial for live incident response, allowing you to watch for specific error codes or attack patterns as they happen.
5. Vulnerability Scanning and Validation
Understanding how to use scanning tools to validate and understand vulnerabilities is key.
Nmap Scanning for Service Discovery and Validation nmap -sS -sV -O 192.168.1.0/24 SYN scan with service/OS detection on a network nmap -p 80,443,22 --script http-title,ssh2-enum-algos 192.168.1.10 Targeted scan with NSE scripts nmap --script vuln 10.0.0.5 Run all NSE scripts categorized as "vuln" masscan -p1-65535 10.0.0.0/8 --rate=1000 Very fast port scan of a large network range Curl for Web Application Testing curl -H "User-Agent: Mozilla/5.0" -I http://example.com/admin Send a crafted request to check for directory access curl -X POST http://test.com/login -d "username=admin&password=guess" Test login endpoints curl -s http://example.com/backup.zip -o downloaded_backup.zip Check for exposed backup files
Step-by-step guide: Use `nmap -sS` for a stealthy initial discovery of live hosts and open ports. Follow up on specific services with version detection (-sV) to identify potentially vulnerable software versions. The Nmap Scripting Engine (NSE) is powerful; use `–script vuln` to run a battery of common vulnerability checks against a target. For web applications, `curl` is your best friend for manually interacting with endpoints. Craft requests with specific headers (-H) to bypass simple security controls and test for improper access, or use it to probe for sensitive files left in web roots.
6. SIEM Query Fundamentals
While SIEMs have GUIs, the underlying query logic is universal. These are conceptual examples for Splunk and ELK Stack.
Splunk-style Query for Detection index=windows EventCode=4688 (New_Process_Name="cmd.exe" OR New_Process_Name="powershell.exe") | stats count by host, user, Parent_Process_Name Sigma Rule YAML (Conceptual) title: Suspicious PowerShell Execution logsource: product: windows category: process_creation detection: selection: Image|endswith: '\powershell.exe' CommandLine|contains: - 'Hidden' - 'EncodedCommand' condition: selection Elasticsearch Query (KQL) for Log Analysis event.category:"network" and destination.port:443 and source.ip:192.168.86.1 and not destination.ip: (8.8.8.8 or 1.1.1.1)
Step-by-step guide: A core detection rule involves spotting suspicious process chains. The Splunk query above looks for the creation of `cmd.exe` or `powershell.exe` (EventCode 4688) and aggregates the results to show which host, user, and parent process are involved—this can quickly uncover living-off-the-land binary (LOLBin) attacks. Understanding the structure of a Sigma rule helps you convert threat intel into actionable detections. For Elasticsearch, use KQL (Kibana Query Language) to filter network events, in this case looking for TLS traffic (port 443) from an internal IP to destinations that are not well-known DNS servers, a potential sign of C2 communication.
What Undercode Say:
- The Time Investment is Non-Negotiable: The original post’s central thesis is correct; achieving SOC readiness is a marathon of consistent, focused practice, not a sprint fueled by passive video consumption. The commands listed here are not just to be read, but to be executed, experimented with, and understood in context across hundreds of hours in home labs and on platforms like TryHackMe and HackTheBox.
- Depth Over Breadth Wins the Job: Knowing 25 commands inside and out—understanding their output, their flags, and how they fit into an investigative workflow—is infinitely more valuable than having a superficial awareness of 250 tools. Recruiters and hiring managers probe for depth. They will ask why you chose a specific `ss` flag or how you would correlate the output of `Get-NetTCPConnection` with a process list. This deep, practical knowledge is what separates a prepared candidate from an unprepared one.
The notion that a few entry-level certifications are a golden ticket is a dangerous oversimplification of the cybersecurity labor market. The commands and methodologies outlined in this article represent the daily grunt work of a Tier 1/Tier 2 SOC analyst. Mastery of these fundamentals demonstrates a commitment to the craft that goes beyond checking a certification box. It shows a potential employer that you have not just learned about security, but you have practiced it. This practical competence, built over 12-18 months of dedicated effort as the original post suggests, is the true barrier to entry. It is a barrier that protects the integrity of the profession and ensures that new analysts are not set up for failure.
Prediction:
The growing disconnect between “bootcamp-ready” candidates and “job-ready” analysts will force a market correction. We will see a rise in more rigorous, hands-on technical assessments during the hiring process, moving beyond multiple-choice questions to practical, time-boxed investigations in simulated environments. Hiring managers, burned by candidates who are certified but not capable, will prioritize demonstrable lab work and problem-solving skills over paper credentials alone. This will further solidify the need for the kind of deep, consistent, and self-driven technical practice championed in the original post, making the candidate with a well-documented home lab and a GitHub portfolio more competitive than the one with a pristine resume but no practical skills to back it up.
🎯Let’s Practice For Free:
IT/Security Reporter URL:
Reported By: Sean Mitchell – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
