Containing Active Breach

Containing Active Breach

Overview

Cybersecurity skill for containing active breach. Follows industry best practices and security standards.

When to Use

Trigger phrases:

• "containing active breach"

• "Executes containment strategies to stop active adversary operations and prevent "

• A confirmed intrusion is in progress with an active adversary on the network

• Malware is spreading laterally across endpoints or servers

• A compromised account is being used for unauthorized access to systems

• Ransomware encryption has been detected and is actively propagating

• An attacker has established command-and-control communications from internal hosts

Do not use for post-incident cleanup when the adversary is no longer active; use eradication procedures instead.

When NOT to Use

• When you lack proper authorization for testing
• For production systems without change management
• When the task requires legal or compliance expertise beyond technical scope

Prerequisites

• Confirmed incident classification with P1 or P2 severity from triage
• EDR console access with host isolation capabilities (CrowdStrike Falcon, Microsoft Defender for Endpoint, SentinelOne)
• Network firewall and switch management access for segmentation
• Active Directory or identity provider administrative access for credential actions
• Pre-approved containment authority documented in the incident response plan
• Evidence preservation plan to avoid destroying forensic artifacts during containment

Workflow

# Example: IOC detection
import re

IOC_PATTERNS = {
    "ip": r"\b(?:\d{1,3}\.){3}\d{1,3}\b",
    "domain": r"\b[a-z0-9-]+\.[a-z]{2,}\b",
    "hash_md5": r"\b[a-f0-9]{32}\b",
    "hash_sha256": r"\b[a-f0-9]{64}\b",
}

def extract_iocs(text: str) -> dict:
    return {k: re.findall(v, text) for k, v in IOC_PATTERNS.items()}

1. Define Objectives — Clarify the goals and scope for active breach.
2. Gather Resources — Collect tools, data, and access needed for active breach.
3. Execute Process — Carry out active breach operations methodically.
4. Verify Quality — Check results against acceptance criteria.
5. Document Outcomes — Record findings, decisions, and next steps.

Tools

• Analysis Platform — Data processing and visualization
• Collaboration Tools — Team coordination and knowledge sharing

Process

1. Reconnaissance — Gather target information, identify attack surface, enumerate services
2. Analysis/Exploitation — Execute the technique, analyze results, document findings
3. Reporting — Document IOCs, write findings, provide remediation recommendations

Verification

• All active breach procedures executed completely and documented
• Findings validated against multiple data sources
• False positives identified and filtered
• Results documented with evidence and timestamps
• Recommendations provided with risk-based prioritization

Anti-Rationalization Table