Arkime
Open-source full-packet-capture indexing and search system (formerly Moloch): stores PCAP and session metadata so analysts can search and pull the exact packets of a session.
In triage: retrieve the actual bytes of a suspicious session, not just its summary.
Watch for: full capture fills storage fast; retention may be days, so pull what you need early.
Open source · Formerly: Moloch
Renamed 2020-11 formerly Moloch Owner: Open source Checked 2026-10-13 Source
Cisco Umbrella
Cloud-delivered DNS-layer security; blocks malicious domains at resolution time and logs every lookup per identity. Now sold as part of Cisco Secure Access; Cisco has announced end of life for the standalone Umbrella SIG and DNS offers.
In triage: which host or user resolved a domain, when, and whether the lookup was blocked.
Watch for: DNS logs show the lookup, not whether a connection followed; check proxy or flow data.
Vendor: Cisco · Also: Cisco Secure Access
Source: CiscoCloudflare One
Cloudflare’s SSE platform: secure web gateway, zero-trust network access, cloud access security broker (CASB) and DNS filtering delivered from its edge network.
In triage: Gateway HTTP and DNS logs and Access logs show what a user reached and through which policy.
Watch for: log retention and full HTTP logging depend on plan; export to the SIEM for history.
Vendor: Cloudflare
Corelight
Commercial NDR built on Zeek and Suricata: sensors produce Zeek logs and Suricata alerts, plus detections and smart PCAP.
In triage: conn, dns, http, ssl and files logs that answer “what did this host talk to?”
Watch for: it sees only the segments where sensors sit; east-west traffic is often unmonitored.
Vendor: Corelight · Also: Zeek, Suricata
Darktrace
Network detection and response vendor (also email, cloud, and OT) whose Behavioral Defense Platform models per-device and per-user behavior to flag anomalies; its autonomous response capability (originally branded Antigena) can block connections on its own. Treat its model-breach alerts as anomaly detections that need corroboration.
In triage: model-breach details list the devices, connections and the behavior that broke the model.
Watch for: autonomous response may already have blocked traffic, which changes what you can observe next.
Vendor: Darktrace (privately held by Thoma Bravo since 2024)
Source: DarktraceFortinet FortiGate
Next-generation firewall (NGFW) family with IPS, web filtering, VPN and application control, managed through FortiOS.
In triage: traffic, UTM and VPN logs: allowed and denied sessions, application IDs and remote-access sign-ins.
Watch for: FortiGate SSL-VPN and management interfaces have been repeatedly exploited; an internet-facing appliance is itself an asset to scope.
Vendor: Fortinet
NetFlow
Cisco’s flow-export format: per-connection metadata (5-tuple, bytes, packets, timestamps) without payloads. Standardized as IPFIX (RFC 7011); cloud equivalents are AWS VPC Flow Logs, Azure VNet flow logs and GCP VPC Flow Logs.
In triage: confirm whether two hosts talked, for how long and how much data moved.
Watch for: routers often sample flows (1 in N packets), so small transfers can be missing.
Origin: Cisco · Also: sFlow, AWS VPC Flow Logs
Source: RFC 7011Netskope
SSE platform combining secure web gateway, CASB, zero-trust network access and inline DLP for web and SaaS traffic.
In triage: per-user web and SaaS activity, including instance-level detail (personal vs corporate cloud storage).
Watch for: traffic that bypasses the client (unmanaged devices, steering exceptions) is invisible.
Vendor: Netskope
NIDS (concept)
Network intrusion detection: inspects traffic for signatures, protocol anomalies, and behavioral indicators.
In triage: a rule hit names the signature, the flow and often the payload snippet that matched.
Watch for: a signature match says the traffic looked like an attack, not that the attack worked.
Category card · Full entry: C.L.E.A.R.
Palo Alto Networks NGFW
Next-generation firewalls (PA-Series, VM-Series) with App-ID, User-ID, threat prevention and URL filtering, managed by PAN-OS and Strata Cloud Manager.
In triage: traffic, threat and URL logs tie a session to an application and, with User-ID, to a user.
Watch for: GlobalProtect portals and management interfaces are frequent targets; check the appliance itself.
Vendor: Palo Alto Networks
RITA
Open-source tool (Real Intelligence Threat Analytics) that analyzes Zeek logs to find beaconing, long connections, DNS tunneling and threat-intel matches.
In triage: a ranked list of hosts with regular, beacon-like connections.
Watch for: update checkers and telemetry agents beacon too; confirm the destination before you call it C2.
Vendor: Active Countermeasures (open source)
Security Onion
Free platform for network security monitoring and log management: Zeek metadata, Suricata alerts and full packet capture behind one console, with Elastic for search. An Import installation replays a packet capture through Zeek and Suricata and keeps its original timestamps.
In triage: pivot from a Suricata alert to the Zeek logs and the packets for the same connection.
Watch for: it sees only the segments its sensors tap; on an imported capture, set the time range to the capture, not to today.
Vendor: Security Onion Solutions · Elastic License 2.0 · Also: Labs
Source: Security Onion documentationSnort
Open-source NIDS/IPS with deep packet inspection (Snort 3 is the current major version). Rules come in three tiers distributed by Cisco Talos: a free Community set (a subset of the subscriber rules), a Registered set (free sign-up, delayed release), and a paid Subscriber set.
In triage: the rule SID and message name what matched; look the SID up to read the rule logic.
Watch for: which rule tier you run decides how current your detections are.
Vendor: Cisco (Talos)
Source: Snort FAQSuricata
Open-source NIDS/IPS with multi-threaded inspection, file extraction, TLS handshake logging (SNI, certificates, JA3/JA4; no decryption), and EVE JSON output. Maintained by OISF.
In triage: EVE alert, flow, dns, http and tls records share a flow ID, so one alert pivots to the whole session.
Watch for: it does not decrypt TLS; payload rules only fire on cleartext.
Maintainer: Open Information Security Foundation (OISF)
Source: Suricata docsVectra AI
NDR and identity-threat detection platform that scores attacker behaviors across network, Entra ID, Microsoft 365 and AWS control planes.
In triage: prioritized host and account entities with the detections that raised their score.
Watch for: a score is an aggregate; read each underlying detection before acting.
Vendor: Vectra AI
Wireshark
Open-source packet analyzer; deep protocol decoding for investigation and forensics.
In triage: open a PCAP, follow a stream and export the objects it carried.
Watch for: opening untrusted captures has exploited dissector bugs before; analyze in an isolated VM.
Open source · Also: tshark (command line)
Zeek (formerly Bro)
Behavior-focused network monitoring producing structured session logs for SIEM-friendly analytics.
In triage: conn.log, dns.log, http.log, ssl.log and files.log, joined by the connection UID.
Watch for: Zeek records what happened, not whether it was bad; it pairs with a NIDS or RITA for detection.
Open source
Renamed 2018-10 formerly Bro Owner: Open source Checked 2026-10-13 Source
Zscaler Internet Access
Zscaler’s cloud secure web gateway: inline proxy with TLS inspection, URL filtering, sandboxing, firewall and DLP for user traffic.
In triage: web transaction logs give the full URL, user, policy action and threat verdict.
Watch for: TLS-inspection bypass lists (banking, health, pinned apps) leave those sessions as hostname only.
Vendor: Zscaler