Full Report
Here at Orange Cyberdefense, clients often ask us to test and help secure their infrastructure. We do this a lot. We test clients, we test ourselves, and we set up labs to test new ideas and tools. We’ve become quite good at this, if we say so ourselves, and would love to share some of the lessons we’ve learned along the way with anyone that would be interested. That’s what our Enterprise Infrastructure Hacking course is all about: it’s our way of sharing what we’ve learned with you.
Analysis Summary
# Best Practices: Enterprise Infrastructure Security & Hacking Countermeasures
## Overview
These practices are derived from lessons learned during enterprise infrastructure penetration testing, focusing on the common attack vectors used to breach perimeters, establish footholds, move laterally, and escalate privileges within an internal network. They serve as both offensive insights for testing and defensive guidance for hardening environments.
## Key Recommendations
### Immediate Actions
1. **Audit and Restrict Default Credentials:** Immediately scan all network services, systems, and applications for any deployed default or hardcoded credentials and enforce immediate password changes or removal.
2. **Review Perimeter Exposure:** Conduct an immediate review of externally facing assets to identify any potential points for initial foothold exploitation, including misconfigured services that could be vulnerable to low-hanging fruit attacks.
3. **Isolate Initial Foothold Vectors:** Ensure any host that allows command execution via tools impersonating WMI (like `wmiexec.py`) is strictly monitored or restricted to high-trust administrators only.
### Short-term Improvements (1-3 months)
1. **Implement Credential Guard Measures:** Apply mitigations against common credential-harvesting techniques such as LLMNR spoofing/reflection attacks by enabling solutions like Windows Defender Firewall rules to block inbound legacy protocols or using secure DNS configurations.
2. **Audit Least Privilege for Account Resets:** Review Active Directory permissions (specifically the `ForceChangePassword` attribute or similar delegation rights) to ensure standard user accounts cannot unilaterally force password resets on privileged accounts.
3. **Deploy Endpoint Detection for Scripting:** Deploy endpoint monitoring capabilities capable of detecting and alerting on the invocation of common red team PowerShell toolsets (e.g., PowerView) on domain-joined hosts.
### Long-term Strategy (3+ months)
1. **Establish Comprehensive Attack Path Mapping:** Integrate tools (like BloodHound) into standardized security assessments to proactively map out and remediate complex attack paths leading to domain compromise, focusing on multi-step privilege escalation chains.
2. **Thoroughly Test Privilege Escalation Mechanisms:** Regularly conduct internal penetration tests specifically aimed at achieving known, complex escalation techniques like DCSync and Kerberoasting to validate existing defenses.
3. **Integrate Defensive Feedback Loops:** Establish continuous logging ingestion (e.g., via an ELK stack or equivalent SIEM) for all security testing activities to generate high-fidelity alerts that can be used to fine-tune Blue Team detection signatures against known attack signatures before real adversaries utilize them.
## Implementation Guidance
### For Small Organizations
- Focus efforts on securing the perimeter and immediately eliminating default credentials across all discovered assets (including network gear and initial domain controllers).
- Prioritize the security of the primary account used for network administration, as successful compromise of this single account often replicates the impact of advanced attacks.
### For Medium Organizations
- Begin systematic auditing of Active Directory delegation where users might have rights beyond necessity (e.g., the ability to alter other users' account properties).
- Implement centralized logging for security events from domain controllers and critical servers to begin building a threat detection baseline.
### For Large Enterprises
- Mandate the use of attack path analysis tools (like BloodHound) within audit cycles to identify and break complex chains involving multiple hops and less-obvious trust relationships.
- Develop formalized playbooks (for the Blue Team) that specifically address detection and response chains for techniques encountered during testing, such as PowerShell loading and credential dumping.
## Configuration Examples
While specific configuration syntax was not detailed, the foundational concept revolves around mitigating specific attack tools:
1. **To block LLMNR/NBT-NS Reflection:** Configure client machines via Group Policy to disable or restrict NetBIOS Name Service and LLMNR resolution when DHCP is not available or to mandate NDN/DNS-only lookups where possible.
2. **To mitigate ForceChangePassword abuse:** Revoke the `ForceChangePassword` right on generic user objects in Active Directory. This right should generally only be granted where strictly necessary (e.g., service accounts managing specific groups).
3. **WMI Execution Hardening:** Severely restrict WMI DCOM access via Windows Firewall rules or DCOM security settings on workstations and servers to only allow necessary management hosts (e.g., dedicated administration jump boxes).
## Compliance Alignment
The processes derived from infrastructure hacking lessons strongly support the alignment with:
- **NIST Cybersecurity Framework (CSF):** Particularly the **Identify (ID)** functions (Asset Management, Risk Assessment) and the **Protect (PR)** functions (Access Control, Data Security).
- **CIS Critical Security Controls (CSC):** Specifically Control 4 (Audit Log Management & Analysis) and Control 5 (Account Management, focusing on least privilege).
- **ISO/IEC 27001:** Annex A controls related to documenting access rights and managing privileged access.
## Common Pitfalls to Avoid
- **Treating Infrastructure Testing as a One-Off Event:** Security posture degrades over time; testing must be continuous to catch new misconfigurations introduced during routine changes.
- **Ignoring Internal Foothold Scenarios:** Focusing solely on the external perimeter without simulating lateral movement greatly underestimates real-world risk.
- **Not Validating Blue Team Detections:** Running advanced attacks without having a corresponding logging/detection mechanism in place means the organization is blind to the actual attack being performed.
## Resources
- **Attack Path Discovery Tool:** Tools similar to BloodHound (used to map relationships and privileges).
- **PowerShell Execution Monitoring:** Endpoint Detection and Response (EDR) solutions capable of deep PowerShell logging and script block analysis.
- **SIEM/Log Aggregation:** Platforms (like an ELK stack or commercial SIEMs) used to aggregate logs from domain-joined hosts to observe attack signatures.