Skill

hunting-for-unusual-network-connections

From asi

Hunts for unusual network connections by analyzing outbound traffic patterns, rare destinations, non-standard ports, and anomalous frequencies from endpoints using EDR and SIEM tools.

security

monitoring

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Tool Access

This skill uses the workspace's default tool permissions.

Preview

- When proactively hunting for indicators of hunting for unusual network connections in the environment

SKILL.md

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Hunts for Advanced Persistent Threats (APTs) in enterprise environments using hypothesis-driven searches on endpoint telemetry, network logs, and memory artifacts. For threat hunting cycles, UEBA investigations, and TTP validation.

asi

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Parent Repo Stars16

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Last CommitApr 4, 2026

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Hunting For Unusual Network Connections

When to Use

When proactively hunting for indicators of hunting for unusual network connections in the environment
After threat intelligence indicates active campaigns using these techniques
During incident response to scope compromise related to these techniques
When EDR or SIEM alerts trigger on related indicators
During periodic security assessments and purple team exercises

Prerequisites

EDR platform with process and network telemetry (CrowdStrike, MDE, SentinelOne)
SIEM with relevant log data ingested (Splunk, Elastic, Sentinel)
Sysmon deployed with comprehensive configuration
Windows Security Event Log forwarding enabled
Threat intelligence feeds for IOC correlation

Workflow

Formulate Hypothesis: Define a testable hypothesis based on threat intelligence or ATT&CK gap analysis.
Identify Data Sources: Determine which logs and telemetry are needed to validate or refute the hypothesis.
Execute Queries: Run detection queries against SIEM and EDR platforms to collect relevant events.
Analyze Results: Examine query results for anomalies, correlating across multiple data sources.
Validate Findings: Distinguish true positives from false positives through contextual analysis.
Correlate Activity: Link findings to broader attack chains and threat actor TTPs.
Document and Report: Record findings, update detection rules, and recommend response actions.

Key Concepts

Concept	Description
T1071	Application Layer Protocol
T1095	Non-Application Layer Protocol
T1571	Non-Standard Port

Tools & Systems

Tool	Purpose
CrowdStrike Falcon	EDR telemetry and threat detection
Microsoft Defender for Endpoint	Advanced hunting with KQL
Splunk Enterprise	SIEM log analysis with SPL queries
Elastic Security	Detection rules and investigation timeline
Sysmon	Detailed Windows event monitoring
Velociraptor	Endpoint artifact collection and hunting
Sigma Rules	Cross-platform detection rule format

Common Scenarios

Scenario 1: Backdoor communicating to C2 on non-standard port
Scenario 2: Data exfiltration over DNS to attacker nameserver
Scenario 3: Compromised host scanning internal network
Scenario 4: Cryptominer connecting to mining pool

Output Format

Hunt ID: TH-HUNTIN-[DATE]-[SEQ]
Technique: T1071
Host: [Hostname]
User: [Account context]
Evidence: [Log entries, process trees, network data]
Risk Level: [Critical/High/Medium/Low]
Confidence: [High/Medium/Low]
Recommended Action: [Containment, investigation, monitoring]