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Enterprise Network Security & VAPT

Network Security Audits, Pen Testing & Perimeter Hardening

Identify exploitable network vulnerabilities, eliminate lateral movement paths, and harden internal and external perimeters. Guru Group LLC conducts deep External & Internal Penetration Testing, Active Directory domain audits, Next-Gen Firewall evaluations, and Zero Trust microsegmentation validation.

Explore Network Disciplines Inspect Attack Path Explorer
Certified Network Penetration Testers
OSCP, CEH, CISSP & CREST Accredited

Protecting complex corporate infrastructures from perimeter compromise, Kerberoasting, ransomware propagation, and unsegmented broadcast domains.

100%

Port / Host Audit

0-Day

Exploit Coverage

Zero

Network Outage
Perimeter & Core Defense

Stopping Adversaries at the Perimeter & Neutralizing Lateral Traversal

Enterprise networks connect hybrid clouds, distributed branch offices, corporate identities, and remote workforces into a single operational fabric.

However, traditional perimeter firewalls can no longer safeguard against sophisticated threat actors who breach edge services, compromise remote credentials, and traverse unsegmented internal networks to reach critical domain controllers. Guru Group LLC provides comprehensive external and internal network penetration testing and vulnerability assessments (VAPT). We expose hidden attack paths, misconfigured routers, vulnerable VPN concentrators, and Active Directory trust flaws before malicious actors weaponize them.

Schedule a Network Penetration Test
Zero Trust Architecture Lateral Containment

Eliminate Flat Network Vulnerabilities

Transform flat, breach-vulnerable corporate subnets into identity-driven microsegmented zones with full East-West traffic inspection.

Active Directory Defense

Neutralize BloodHound attack paths, Kerberoasting, and domain privilege escalation.

SASE & Remote Access

Verify VPN SSL/TLS ciphers, MFA enforcement, and secure service edge (SASE) posture.

Core Disciplines

The Four Pillars of Network Security & Pen Testing

Exhaustive ethical hacking methodologies designed to evaluate network boundaries, test internal resilience, and enforce Zero Trust segmentation.

Internet Edge Perimeter

External Perimeter Penetration Testing

Simulates external hacker reconnaissance and intrusion against internet-exposed assets. We probe public IP blocks, boundary firewalls, VPN endpoints (Pulse Secure, Fortinet, Cisco AnyConnect), DNS services, and edge mail servers for exploitable services and unpatched firmware vulnerabilities.

Edge Telemetry Inspector 65,535 Ports Scanned
Edge Gateway & Firewall Rule Bypass Evaluation
VPN & Remote Access SSL/TLS Downgrade Resistance
DNS Zone Transfer & Subdomain Takeover Analysis
Target: Public IP Blocks / Edge Firewalls / VPNs Consult External Leads →
Internal Core & AD

Internal Network & Active Directory Audits

Simulates an attacker with an initial foothold on your internal LAN/VLAN (or a malicious insider). We assess Active Directory architectures, Group Policy Objects (GPOs), Kerberos authentication tickets (Kerberoasting, AS-REP roasting), and lateral movement to Domain Administrator privileges.

Domain Attack Path Radar BloodHound Verified
Kerberoasting, Pass-the-Hash & DCSync Attack Resistance
Tiered Administration & GPO Permission Vulnerabilities
LLMNR/NBT-NS Poisoning & SMB Relay Prevention
Target: Active Directory / Domain Controllers / Internal LAN Consult AD Leads →
Microsegmentation & ZTNA

Zero Trust Network Architecture (ZTNA) & Segmentation

Validate that network boundaries properly contain adversaries. We verify that internal subnets cannot freely communicate without deep packet inspection, testing East-West firewalls, virtual local area networks (VLANs), and identity-based network access control (NAC) policies.

Containment Validation Zero Trust Model
VLAN Hopping & Double Tagging Attack Verification
East-West Traffic Inspection & Next-Gen Firewall Policy Rules
Software-Defined Perimeter (SDP) Isolation Testing
Target: Cisco / Palo Alto / Fortinet / VMware NSX Consult ZTNA Leads →
Wireless & Remote Perimeter

Wireless & Remote Access Security Auditing

Examine corporate wireless networks, remote worker VPN connections, and branch office SD-WAN tunnels. We test WPA2/WPA3 Enterprise authentication, 802.1X RADIUS certificates, rogue access point injection, captive portal bypass, and guest network isolation.

RF & Wireless Security 802.1X Tested
Evil Twin & Rogue AP Impersonation Resistance
Guest Wi-Fi to Internal LAN Demarcation Verification
Remote Access VPN Split-Tunneling Security Checks
Target: Aruba / Cisco Meraki / Ruckus / SASE Consult Wireless Leads →
Architecture Evolution

The Perimeter Shift: Traditional Flat Network vs. Guru Group ZTNA

Compare the dangerous vulnerabilities of legacy flat networks with the resilient containment of an identity-driven Zero Trust architecture.

Network Security Vector
Traditional Legacy Flat Network
Guru Group Zero Trust Network
Internal Network Topology
Single flat subnet where any compromised workstation can probe servers and databases unhindered.
Microsegmented security zones where East-West traffic requires explicit identity and policy validation.
Active Directory Privilege Paths
Unmonitored domain trusts, circular group memberships, and unconstrained Kerberos delegation.
Strict Tier 0/1/2 administrative segregation with protected users groups and hardened SPNs.
Perimeter Firewall Verification
Legacy port/IP rule sets accumulated over years with forgotten legacy allow-all exceptions.
Next-Gen Application-Aware inspection (Layer 7) with continuous rule audits and automated cleanup.
Lateral Ransomware Traversal
Rapid propagation across SMB (Port 445), RDP (Port 3389), and WMI within minutes of initial breach.
Host-based endpoint firewall isolation and strict port containment blocking lateral spreads instantly.
Egress Traffic & Data Exfiltration
Unfiltered outbound traffic allowing reverse shells and encrypted C2 exfiltration over Port 443.
TLS Decryption and inspection with strict egress filtering and DNS sinkholing of malicious domains.
Live Attack Vector Simulator

Interactive Network Penetration & Attack Path Explorer

Explore how Guru Group systematically identifies, exploits, and permanently remediates critical network attack vectors across enterprise infrastructures.

Select Network Attack Path
1. Perimeter Edge & VPN Breach
External Gateway Penetration
2. Active Directory Privilege Escalation
Kerberoasting & Domain Admin Pivot
3. VLAN Hopping & Lateral Movement
East-West Microsegmentation Test
4. C2 Beaconing & Exfiltration
Egress Filtering & DNS Sinkholing
External Perimeter Vector Edge Firewall & VPN

External Gateway & Boundary Defense Evaluation

Probes internet-facing IP ranges for unpatched remote access vulnerabilities, insecure cipher suites, and misconfigured perimeter firewall rule sets.

External Threat Tier
Internet Reconnaissance Probes
Defense Boundary
Next-Gen Perimeter Firewall
Remediated Target
Hardened Edge & Drop Telemetry
Testing Standard
NIST SP 800-115 / PTES Framework
Inspection Protocol
Full TCP/UDP Port Range + Service Fingerprint
Operational Safety
Controlled Non-Disruptive Payloads
Remediation Delivery
Turnkey Firewall Rule Syntax & Patch Guide
Audit This Network Attack Vector CREST & OSCP Certified Testers
Rigorous Methodology

The Four-Phase Network Pen Testing Playbook

Our proven penetration testing methodology adheres to the Penetration Testing Execution Standard (PTES) and NIST SP 800-115 guidelines.

01
Recon & Mapping
Phase 1: Discovery

Passive and active reconnaissance across public CIDR blocks, DNS zoning, port mapping, and cataloging all responsive network interfaces.

02
Vulnerability Analysis
Phase 2: Assessment

Automated and manual vulnerability identification covering unpatched services, default credentials, weak ciphers, and outdated firmware.

03
Controlled Exploitation
Phase 3: Pen Testing

Safe, non-destructive exploitation demonstrating verified impact: breaching perimeters, pivoting across VLANs, and escalating domain rights.

04
Remediation & Re-Test
Phase 4: Closure

Executive risk summaries, detailed engineering remediation blueprints, complimentary re-testing, and compliance attestations.

Enterprise Arsenal

Enterprise Network Security & Testing Tooling

We utilize the world's most capable network reconnaissance engines, exploit frameworks, and active telemetry analyzers to ensure exhaustive coverage.

Reconnaissance & Port Auditing
  • Nmap & Masscan high-speed stateful port discovery
  • Wireshark & tcpdump deep packet protocol decoders
  • Tenable Nessus & Qualys enterprise vulnerability scanners
  • Amass & Recon-ng advanced attack surface mapping
Active Directory & Post-Exploitation
  • BloodHound graph theory attack path visualizers
  • Impacket suite (secretsdump, wmiexec, smbexec)
  • Mimikatz & Rubeus Kerberos ticket manipulation engines
  • Metasploit Pro enterprise exploitation framework
Wireless & Perimeter Hardware
  • Aircrack-ng & Kismet 802.11 wireless analysis suites
  • Alfa high-gain directional spectrum adapters
  • Palo Alto PAN-OS & Fortinet FortiOS rule evaluators
  • Zeek & Suricata network intrusion detection (NIDS)
NIST SP 800-115
PTES Standard
OSCP Certified
CISSP Certified
BloodHound Active Directory
Tenable Nessus Pro
Palo Alto Networks
Cisco Zero Trust
Quantifiable Returns

Measurable Network Hardening & ROI

Rigorous network penetration testing eliminates blind spots, protects critical corporate assets from ransomware, and fulfills strict compliance requirements.

99.9%
Attack Path Elimination

Complete eradication of identified lateral traversal and domain privilege escalation routes.

100%
Active Directory Hardening

Full alignment with Microsoft Tiering Models, disabling vulnerable NTLMv1 and securing Kerberos SPNs.

Zero
Network Disruption

All tests adhere to strict rules of engagement, executing during agreed windows with zero service outages.

6x
Accelerated Remediation

Ready-to-deploy firewall rule configurations and GPO templates accelerate engineering remediation.

Enterprise Network Leadership

Why Global Enterprises Choose Guru Group for Network Defense

We combine defensive network architecture wisdom with offensive ethical hacking capability.

Guru Group LLC doesn't deliver generic automated scan reports. Our network engineers hold elite certifications (OSCP, CEH, CISSP) and understand the intricacies of enterprise routing, BGP peering, SD-WAN, and hybrid identity. We provide realistic, scenario-based evaluations that reveal how an attacker could move from a guest Wi-Fi portal or phishing foothold to full domain takeover—and provide the exact architectural configurations to stop them.

Senior-Led Ethical Hackers

Every engagement is conducted by offensive security certified practitioners with years of live penetration testing experience.

Human-Verified Exploit Proofs

Every finding includes verifiable proof-of-concept steps, screen captures, and exact firewall rule recommendations.

Free Verification Re-Testing

We re-audit patched firewall rules and Active Directory settings within 30 days to certify 100% vulnerability closure.

Enterprise Benchmarks & Standards

PTES / NIST

Methodology Standards Structured testing framework

100%

Zero Interruption Guaranteed production safety

OSCP / CISSP

Certified Engineers Accredited ethical hackers

99.9%

Client Satisfaction Proven enterprise track record
Harden Your Network Perimeter

Ready to Neutralize Network Attack Paths & Secure Active Directory?

Schedule an architectural network penetration testing consultation with our lead security directors to validate your perimeters and achieve compliance readiness.

Request a Network Pen Test
Enterprise Guidance

Frequently Asked Questions

Answers to essential architectural, operational, and scheduling questions regarding Guru Group's Network Security & Pen Testing Services.

An External Network Penetration Test evaluates your organization from the outside across all internet-facing IP addresses, firewalls, VPNs, and DNS records, identifying vulnerabilities that external threat actors could exploit to breach your perimeter. An Internal Network Penetration Test evaluates your environment from the perspective of an attacker who has already breached the perimeter (or a malicious employee), testing internal segmentation, Active Directory security, and lateral movement vectors to high-value assets.

No. Our senior ethical hackers operate under strict Rules of Engagement (RoE). We use controlled, non-destructive exploit payloads and bandwidth throttling to eliminate any risk of network congestion or system failure. If specific sensitive systems require off-hours execution (such as night or weekend testing), we accommodate your maintenance windows seamlessly.

We utilize specialized tooling such as BloodHound, Rubeus, and Impacket to map the entire Active Directory graph. We query Service Principal Names (SPNs) configured with weak encryption (RC4-HMAC) for offline Kerberoasting, check for accounts susceptible to AS-REP roasting, test for unconstrained delegation vulnerabilities, and verify whether any non-domain admin user possesses write or replication permissions capable of triggering a DCSync attack.

Yes. For internal assessments, we offer multiple flexible deployment options: your team can deploy a pre-configured, hardened virtual appliance (OVA/VHD) inside your VMware or Hyper-V cluster, or provide our testers with dedicated VPN access directly into an internal testing subnet. All communications are securely encrypted with mutual certificate authentication.

Regulatory frameworks (including PCI-DSS Requirement 11.3, SOC 2 Common Criteria, and ISO 27001 Control A.12.6) mandate annual internal and external penetration testing as well as segmentation validation. Guru Group provides formal Attestations of Penetration Testing and comprehensive technical reports that satisfy PCI Qualified Security Assessors (QSAs) and third-party SOC 2 auditors.

Yes. Every network penetration testing engagement includes a complimentary re-testing period (valid for up to 30 to 60 days following report delivery). Once your network engineers apply the recommended firewall rules, GPOs, or software patches, we re-test the affected IP addresses to confirm that all findings have been thoroughly and properly remediated.