implementing-network-traffic-analysis-with-arkime skill (Anthropic-Cybersecurity-Skills)

From Public Agent Wiki

What it does. Queries Arkime (formerly Moloch) full packet capture via its API to search sessions, Part of mukul975/Anthropic-Cybersecurity-Skills (817 security skills) (mukul975/Anthropic-Cybersecurity-Skills).
Upstream mukul975/Anthropic-Cybersecurity-Skills
Skill file skills/implementing-network-traffic-analysis-with-arkime/SKILL.md
License Apache-2.0 (skill folder LICENSE)
Author mukul975
Fetched 2026-09-10

Install

  • npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill implementing-network-traffic-analysis-with-arkime, or copy the skill folder into ~/.claude/skills/implementing-network-traffic-analysis-with-arkime/.
  • Raw file: curl -sL https://raw.githubusercontent.com/mukul975/Anthropic-Cybersecurity-Skills/HEAD/skills/implementing-network-traffic-analysis-with-arkime/SKILL.md

SKILL.md (verbatim)

name: implementing-network-traffic-analysis-with-arkime
description: Queries Arkime (formerly Moloch) full packet capture via its API to search sessions,
  download PCAPs, detect C2 beaconing through connection interval/jitter stats,
  spot DNS tunneling via query-length analysis, and flag known-bad TLS certificate
  issuers, using the bundled scripts/agent.py. Use when investigating suspicious
  network flows or doing full-packet-capture forensics against an Arkime deployment.
domain: cybersecurity
subdomain: network-security
tags:
- network-security
- arkime
- full-packet-capture
- nta
- pcap-analysis
- network-forensics
version: '1.0'
author: mahipal
license: Apache-2.0
nist_csf:
- PR.IR-01
- DE.CM-01
- ID.AM-03
- PR.DS-02
mitre_attack:
- T1046
- T1040
- T1557
- T1071
- T1095

Implementing Network Traffic Analysis with Arkime

When to Use

  • When deploying or configuring implementing network traffic analysis with arkime capabilities in your environment
  • When establishing security controls aligned to compliance requirements
  • When building or improving security architecture for this domain
  • When conducting security assessments that require this implementation

Prerequisites

  • Familiarity with network security concepts and tools
  • Access to a test or lab environment for safe execution
  • Python 3.8+ with required dependencies installed
  • Appropriate authorization for any testing activities

Instructions

  1. Install dependencies: pip install requests
  2. Configure Arkime viewer URL and credentials.
  3. Run the agent to query Arkime sessions and analyze traffic:
    • Search sessions by IP, port, protocol, or expression
    • Download PCAP data for forensic analysis
    • Detect C2 beaconing via connection interval analysis
    • Identify DNS tunneling through query length statistics
    • Flag connections to known-bad TLS certificate issuers
python scripts/agent.py --arkime-url https://arkime.local:8005 --user admin --password secret --output arkime_report.json

Examples

Beaconing Detection

Source: 10.1.2.50 -> 185.220.101.34:443
Sessions: 288 over 24 hours
Avg interval: 300s, Jitter: 4.2%
Verdict: HIGH confidence C2 beaconing (jitter < 5%)

Other files in this skill

references/api-reference.md (verbatim)

API Reference: Arkime Network Traffic Analysis

Authentication

HTTPDigestAuth(username, password)

All API requests require Digest authentication.

GET /api/sessions
Parameter Type Description
date int Time range in hours (1=last hour)
expression string Arkime search expression
length int Max results to return
order string Sort field:direction (e.g. lastPacket:desc)
fields string Comma-separated field list

PCAP Download

GET /api/sessions/pcap
GET /api/sessions/pcapng
Parameter Description
date Time range in hours
expression Filter expression
Returns raw PCAP/PCAPNG binary data.

Connection Graph

GET /api/connections

Returns nodes (IPs) and links (connections) for network graph visualization.

SPI View (Field Statistics)

GET /api/spiview
Parameter Description
spi Comma-separated fields (e.g. srcIp,dstIp,dstPort)
Returns top values and counts for each field.

Session Fields

Field Description
srcIp Source IP address
dstIp Destination IP address
srcPort Source port
dstPort Destination port
srcBytes Bytes sent by source
dstBytes Bytes sent by destination
lastPacket Timestamp of last packet (ms)
srcJa3 JA3 fingerprint of client TLS
tls.issuerCN TLS certificate issuer CN
tls.subjectCN TLS certificate subject CN
tls.notAfter Certificate expiry (ms epoch)

Search Expressions

ip.src == 10.0.0.0/8
port.dst == 443
protocols == tls
country.src == CN
bytes > 1000000

Beaconing Detection Logic

  • Collect connection timestamps per (src, dst, port) tuple
  • Calculate intervals between consecutive connections
  • Compute jitter ratio: std_dev / avg_interval
  • Jitter < 0.05 = high confidence C2, < 0.15 = medium

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