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Introduction:
The role of the Security Operations Center (SOC) Analyst is evolving faster than ever. With the rise of AI-generated attacks and identity-based threats, the market is flooded with “alert triagers,” but there is a severe shortage of true investigators. Based on the release of Izzmier Izzuddin Zulkepli’s latest guide, SOC Analyst Is Not Dead, we dissect the core technical competencies required to move beyond ticket-pushing and into deep-dive forensic analysis, providing practical command lines and structured methodologies for the modern SOC.
Learning Objectives:
- Master the command-line investigation techniques for both Linux and Windows endpoints to validate SIEM alerts.
- Learn to structure interview responses and triage decisions like a senior SOC lead during live simulations.
- Identify the shift from signature-based detection to behavioural and identity-focused threat hunting.
You Should Know:
- The “Alert to Artifact” Methodology: Moving Beyond the SIEM
Most junior analysts stop at the SIEM alert. A senior investigator treats the alert as a rumor that requires physical evidence. When you receive an alert for “Suspicious PowerShell Execution,” your first step should never be to close it as a false positive without checking the endpoint.
Step‑by‑step guide (Linux Endpoint Investigation):
If you have SSH access to a Linux host triggered by an alert, do not just run ps aux. You need to capture the state of the process tree at the time of execution.
Check the full command line arguments including hidden Unicode characters cat /proc/[bash]/cmdline | tr '\0' ' ' Check the process environment variables for suspicious proxy settings or script paths strings /proc/[bash]/environ Check memory maps for injected code grep rwxp /proc/[bash]/maps
If the process is dead, check the bash history of the user who spawned it, but also check the `audit.log` if `auditd` is running:
ausearch -p [bash] --interpret
Step‑by‑step guide (Windows Endpoint Investigation):
If you are using EDR or have remote PowerShell, do not rely on the GUI. Use WinRM to pull forensic artifacts.
Get the parent process tree to understand the chain of execution
Get-WmiObject Win32_Process -Filter "ProcessId=[bash]" | Select-Object Name, ProcessId, ParentProcessId
Check for suspicious scheduled tasks created at the time of the alert
Get-ScheduledTask | Where-Object {$_.State -ne 'Disabled'} | Get-ScheduledTaskInfo
2. Simulating the Interview: The “Structured Answer” Framework
The post highlights how simulations teach the thinking process. In a real interview, you might be asked: “You see a single failed logon from a trusted IP. What do you do?”
The wrong answer is “Ignore it.” The structured answer requires a hypothesis.
Step‑by‑step guide to the investigation flow:
- Context Gathering: Check the `Security` Event Log for Event ID 4625. Note the Logon Type.
– Logon Type 3 (Network): Could be a misconfigured service.
– Logon Type 2 (Interactive): Someone physically at the keyboard mistyping a password.
– Logon Type 10 (RemoteInteractive): Someone failing to log in via RDP.
2. Correlation: Run a query for Event ID 4776 (Credential Validation) around the same timestamp to see if the failure was due to a bad password or a locked account.
3. Action: If this is a privileged account (e.g., Domain Admin), even one failure is significant. You must check for a subsequent success (Event ID 4624). If a success occurred minutes later, check the Logon Process and Authentication Package. Was it `Kerberos` or NTLM? If it switched from Kerberos to NTLM, it might indicate a downgrade attack.
3. Tools Configuration: Triage Rules in Your SIEM
Instead of drowning in noise, configure your SIEM to highlight “Triage Priority” based on entity behaviour.
Step‑by‑step guide (Splunk/SIEM query logic):
You want to hunt for “Impossible Travel” but reduce false positives by excluding VPN IPs.
index=authentication action=failure | stats dc(Source_Network_Address) as UniqueIPs, count as FailCount by user | where UniqueIPs > 3 AND FailCount > 10 | join user type=inner [search index=vpn_logs | stats values(VPN_IP) as VPN_IPs by user] | eval Suspicious=if(mvcount(VPN_IPs)>0, "Potential VPN Hopping", "Geographic Impossible Travel")
This script hunts for users failing from multiple IPs, and then checks if those IPs are corporate VPN exit nodes to determine the severity.
4. Cloud Hardening: Investigating the Identity Layer
Modern SOC work is cloud-centric. If you get an alert about “Azure AD risky sign-in,” you must understand the Graph API.
Step‑by‑step guide (Azure/M365 Investigation):
Use the `AzureAD` PowerShell module or `MgGraph` to pull sign-in logs that the portal GUI hides.
Connect to Graph
Connect-MgGraph -Scopes "AuditLog.Read.All", "Directory.Read.All"
Get risky sign-ins that were flagged by machine learning
Get-MgRiskyUser -All | Where-Object {$_.RiskLevel -eq "high"}
For a specific user, drill into the history
Get-MgRiskyUserHistory -RiskyUserId [bash]
Look specifically at the riskEventTypes_v2. Is it `unfamiliarFeatures` or leakedCredentials? Leaked credentials mean the password is compromised, requiring an immediate reset, whereas unfamiliar features might just be a new device.
- Vulnerability Exploitation: The “Living off the Land” Binary Hunt
Attackers don’t just drop malware; they use existing tools (LOLBins). A SOC analyst must recognize normal admin activity vs. malicious use.
Step‑by‑step guide (Detecting malicious `wmic` usage):
Attackers use `wmic` for process execution without touching the disk.
– Alert Scenario: Process creation includes wmic process call create.
– Investigation Command (Linux – inspecting logs via Sysmon):
Use grep to find wmic usage that invokes powershell from network shares grep "wmic" /var/log/sysmon/Operational.evtx | grep -i "call create" | grep -i "powershell" | grep -i "\\"
– Mitigation: If this is a false positive, the admin should be using WinRM or PowerShell Remoting. If it’s malicious, the parent process is often `explorer.exe` (if user double-clicked a malicious script) or `svchost.exe` (if done remotely via scheduled task). Block `wmic` execution via AppLocker or Windows Defender Attack Surface Reduction (ASR) rules.
6. API Security: Investigating Data Exfiltration
When investigating a potential breach, check for unusual API calls to cloud storage.
Step‑by‑step guide (AWS CloudTrail Analysis):
Look for `ListBuckets` followed by `GetObject` from a single IP.
Using AWS CLI to filter JSON logs
aws cloudtrail lookup-events --lookup-attributes AttributeKey=EventName,AttributeValue=GetObject --region us-east-1 --query 'Events[?contains(CloudTrailEvent, <code>\"userIdentity\":{\"type\":\"IAMUser\"}</code>)]' --output text | grep "SourceIPAddress"
If you see a high volume of `GetObject` calls from a user who usually only uploads (PutObject), this indicates potential data harvesting.
What Undercode Say:
- Key Takeaway 1: The SOC role is not dead, but the “alert monkey” role is. Mastery of command-line investigation tools (PowerShell, Bash, Ausearch) is the only job security in 2026. If you cannot validate an alert without a GUI, you will be replaced by an AI.
- Key Takeaway 2: Structured thinking is the new certification. The ability to articulate a triage decision process (as shown in the book’s simulations) separates the analysts from the spectators. Employers are no longer impressed by “years of experience” but by “logic of investigation.”
- Analysis: The industry is suffering from a “Data Rich, Insight Poor” problem. We have EDRs and SIEMs generating petabytes of data, but analysts lack the foundational OS and network knowledge to query it effectively. The shift towards Identity Threat Detection and Response (ITDR) means analysts must now be experts in Active Directory, Azure AD, and OAuth flows, not just packet captures. Without this deep-dive capability, organizations are simply buying security tools they cannot staff properly.
Prediction:
Within the next 18 months, we will see the rise of the “Prompt Injection Hunter” within SOCs. As AI coding assistants become ubiquitous, threat actors will weaponize them to generate polymorphic malware. The future SOC analyst will not just investigate binaries, but will also analyze generative AI output logs to detect if an internal developer inadvertently asked an AI to generate a script that was later used in a supply chain attack. The battleground is shifting from the endpoint to the developer’s IDE and the AI prompt log.
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