Investigate threats using Windows Event logs (PowerShell, login activity), firewall, proxy, and WAF logs.
Once an alert passes triage, the real investigation begins. Analysts start by asking structured questions:
Security Operations Center (SOC) analysts face an overwhelming volume of daily alerts. True threats often hide within massive amounts of harmless network noise. This guide provides a structured framework for conducting fast, accurate, and effective threat investigations. 1. The Core Philosophy of Alert Triage
Scan the environment to see if identical IoCs appear on other segments of the network. Step 3: Reconstruct the Timeline
Work backward in time to locate the exact entry point. effective threat investigation for soc analysts pdf
A successful threat investigation transforms raw, chaotic data into a structured timeline of events. It answers five core questions: Who, what, when, where, and why? The Investigation Lifecycle
Moderately easy to alter; useful for short-term blocking.
Verify if the alert stems from legitimate business activities, automated scripts, or scheduled updates.
: Convert all log times to Coordinated Universal Time (UTC) to prevent time-zone confusion during correlation. Asset Criticality Mapping True threats often hide within massive amounts of
: Prioritize alerts involving high-value assets such as domain controllers or sensitive database servers. 2. Evidence Collection and Investigation
The Cyber Kill Chain helps you track the phase of an attack. Catching an threat during the Weaponization or Delivery phase prevents damage. Catching it during Actions on Objectives means you are dealing with an active data breach. 4. Key Artifacts to Investigate
Before deep-diving, an analyst must determine the legitimacy and urgency of an alert.
Alerts are the starting point for most SOC investigations, but not every alert is worth the same level of attention. Determine severity and priority by evaluating potential business impact—ask questions like "Is this affecting a production server or a low-priority workstation?" The Core Philosophy of Alert Triage Scan the
Use Indicators of Compromise (IoCs) like file hashes, IP addresses, and domain names to search the entire environment.
: Analyze email headers for SPF, DKIM, and DMARC failures. Check if the recipient clicked the link or entered credentials. Inspect the user's account settings for newly created inbox forwarding rules, which attackers use to quietly monitor communication. Ransomware and Malware Execution
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