Choose the right network view
Wireshark provides interactive inspection of captured packets, while tcpdump supports command-line capture and inspection. A capture filter limits what is collected; a display filter changes what you see in an existing capture. Choosing the wrong collection scope can permanently exclude relevant traffic. Record the interface, capture window, filter, and any evidence of dropped packets.
Snort and Suricata provide network threat detection, while Zeek produces structured observations about network activity that support investigation. Alerts identify rule or behaviour matches, not necessarily successful compromise. Encrypted traffic may expose timing and connection metadata while hiding application content. Combine these views with application and endpoint logs instead of treating a packet capture as a complete record of user intent.
Join endpoint, identity, and central logs
A SIEM supports central collection, search, and correlation across sources. EDR provides endpoint-level context such as process relationships and response capabilities. XDR connects detections across multiple security data sources, although coverage depends on the actual deployment. MDM supplies mobile or managed-device configuration context. First ask whether the tool collects the field and time window your investigation requires.
UEBA compares user and entity activity with learned or defined patterns. A tool such as OpenUBA may support that analysis, but unusual behaviour still needs business context. When joining records, use stable identifiers where possible and account for renamed devices, shared addresses, time offsets, and missing sources. Correlation can strengthen a hypothesis without proving one event caused another.
Use enrichment to add context, not authority
Threat-intelligence platforms such as OTX, MISP, and OpenCTI help organise indicators and relationships. Domain registration information, WHOIS services, AbuseIPDB, and IP geolocation add context about infrastructure. Their value depends on freshness, coverage, and relevance. Shared hosting, reassigned addresses, and incomplete registration records limit conclusions about ownership and intent.
MXToolbox and related email diagnostics can help inspect mail-domain configuration. Combine their results with the original message and your own mail-system records; an external lookup cannot recreate every condition at delivery time. For each enrichment, keep the query, source, retrieval time, and confidence. If several feeds repeat one upstream claim, treat them as one underlying observation rather than independent corroboration.