Introduction to Red Team physical intrusion

I/ Understanding physical intrusion

Physical intrusion consists in thwarting the physical security measures put in place to protect an organization's infrastructure, resources and people. Within the framework of offensive cybersecurity operations and more specifically of Red Teaming This encompasses all techniques enabling physical access to sensitive areas, often to simulate a compromise, exfiltrate data or install malicious hardware.

Unlike digital attacks, which are carried out remotely via vectors such as phishing, software vulnerabilities or malware, physical intrusion requires an on-site presence. It involves direct interaction with the physical environment, access control systems, and sometimes even with employees. This can range from simple "tailgating" (discreetly following an employee who is using his or her badge) to the most sophisticated and sophisticated access control systems. advanced intrusion requiring lock-picking or the installation of a network device in a server room.

🎯 Opportunistic vs. targeted intrusion

There are two main types of physical intrusion:

• Opportunistic intrusion, which exploits visible and easily accessible loopholes: a door left ajar, a badge forgotten at hand, a lack of human or technical vigilance.
• Targeted intrusion, on the other hand, is much more methodical, and relies on a preliminary reconnaissance phase: observation of personnel flows, identification of routines, spotting of secondary accesses, gathering of information via social networks or OSINT tools.

The aim is to simulate a realistic adversary: determined, prepared, resourced and capable of carrying out a discreet but effective attack.

In this context, physical intrusion becomes a real strategic lever for assessing an organization's overall security posture. The aim is no longer simply to detect a theoretical vulnerability, but to show how it can be exploited in a credible scenario, by an attacker with malicious intentions.

II/ Challenges and objectives of physical intrusion testing

🚨 The challenges of physical intrusion testing

Physical intrusion tests are mainly designed to verify the actual strength of a company against unauthorized attempts to access its premises or sensitive data.

These tests answer some key questions:

• Are physical security measures really effective?
• Can security personnel, employees or internal processes detect and react to suspicious behavior?
• Could physical access lead to more extensive infiltration of the internal network, servers or computers?

Physical intrusion can expose an organization to unauthorized access to sensitive information, directly compromising data confidentiality and integrity. This threat becomes even more critical when the attack is targeted, as it is often part of a strategy combining physical and digital vectors. Securing physical access is therefore an essential lever for protecting critical assets, in particular to guarantee compliance with standards such as the RGPD or the ISO 27001.

🎯 Intrusion testing objectives

From this perspective, the objectives are numerous and mutually complementary:

a. Assessing the strength of access systems

Whether RFID badges, traditional locks, biometric gates or surveillance cameras, all of these devices can be used to access your premises. can be tested for resistance to bypass techniques.

b. Testing staff vigilance

Testing the human factor: how do employees react to an unexpected presence? How aware are they? Do they tolerate tailgating? Do they open the door to a stranger dressed as a technician?

c. Reproduce realistic attack scenarios

A well-executed physical test can faithfully the tactics, techniques and methods employed by real attackers, just as an industrial spy would.

d. Discover unexpected access routes

These tests often reveal unsuspected access routes: a poorly secured emergency exit, a master key that opens too many doors, a technical closet accessible from the outside...

e. Raise awareness and improve internal practices

Finally, a major but often overlooked objective is to stimulate awareness within the organization. A successful intrusion, even a simulated one, has a significant impact. It prompts us to re-examine procedures, train employees, and review security rules with a more critical eye.

III/ Methodologies and approaches

A physical intrusion test cannot be improvised. It is based on a methodical approach in several steps, aimed at recreating a realistic intrusion scenario within a framework defined with the customer.

🔍 Targeting and recognition phase

Before going out into the field, a thorough reconnaissance is carried out to gather as much information as possible about the site to be tested. The aim is to draw up a mental representation of the environment, identifying exploitable weaknesses.

a. Site identification

• Location, company name, legal structure.
• Environment classification: private (head office, R&D center, warehouse) or public (store, agency, site accessible to the public).

b. Geographic OSINT

• Google Maps, Street View, Apple Maps : analysis of architecture, access points, fences, emergency exits, etc.
• Cadastral plans : consultation of adjacent structures.
• Identification of visible access points: main entrances, delivery zones, staff parking areas, visitor traffic.
• Identification of visible security cameras and other deterrents.

c. OSINT social networks and web

• Search on LinkedIn to profile employees (names, functions, badges visible in photos).
• Analysis of internal photos on Instagram or Facebook.
• Reading Google reviews, internal publications or photos posted by visitors.
• Company pages (blog, press releases) to detect peak periods, moves or special events.

d. Behavioral observation

• Study of hourly flows (opening hours, lunch breaks, staff rotation).
• Human behavior: vigilance, welcoming visitors, perceived level of mistrust.
• Identification of rituals or routines (recurring deliveries, technical passages, etc.).

🧰 Operational readiness

On the basis of the information gathered, the team prepares the intervention by precisely defining the framework, the scenario and the means to be mobilized.

a. Scenario design

• Intrusion realistic or opportunistic, for example by posing as :
• A technician to repair a piece of equipment.
• A delivery man with an urgent parcel.
• A trainee or new employee lost.
• A service provider (cleaning, IT, security).

b. Logistics plan

• Technical equipment: counterfeit badges, RFID tool, booby-trapped USB key, miniature camera.
• Disguises/professional outfits : safety vests, construction site outfits, name badges.
• Physical media : false purchase orders, false printed intervention e-mails.

c. Rules of engagement

• Limits agreed with the customer (prohibited areas, sensitive data not to be handled).
• No intimidation, destruction or unauthorized interaction.
• Emergency stop procedure or de-escalation password if required.

🚪 Intrusion execution

The test is then carried out in real-life conditions, usually without internal safety teams being informed.

a. Objectives

Access one or more critical areas defined with the customer: server room, manager's office, user workstation.

b. Documentation

Every action is rigorously recorded:

• Entry point used, access method (picking, tailgating, RFID badge...).
• Staff reactions (indifference, suspicion, intervention).
• Objects or information captured (screenshots, photos, connected devices).

IV/ Commonly used physical intrusion techniques

Physical intrusion testing relies on a variety of tactics inspired by the world of hacking, private security, and sometimes even espionage. These methods are chosen according to the security level of the target organization, the attack scenario envisaged, and the areas to be infiltrated.

Some techniques are subtle and discreet, while others involve social interactions or physical approaches to bypass security. Here are the main methods used in Red Team physics missions.

📡 RF Signal Analysis

The study of RF signals makes it possible to identify discrete exchanges between wireless devices, such as RFID cards, alarm systems or IoT devices. By intercepting these signals, we can recognize the protocols in use, record a valid transmission, then replay it to simulate legitimate access. This approach is particularly effective when systems have no additional authentication. It is carried out remotely, without the need to touch the devices.

🗝️ Lockpicking

Lockpicking (NLY) is a traditional technique in the field of unauthorized physical access. It enables locks to be opened discreetly without damaging them, whether on doors or secure furniture. Depending on the locking mechanism, the individual can use conventional hooks, percussion keys or fine tools.

🪪 Badge cloning

Badge cloning involves reproducing a badge's signal to fool an access system. With a discreet RFID reader, it is possible to the data contained in a badge simply by being close to the wearer, for example in an elevator. The resulting clone acts just like the original, allowing access control to be passed without a hitch. This technique is particularly effective if the company does not monitor entrances or integrate badges with visual identification.

🏃‍♂️ Tailgating / Piggybacking

Some tactics require no equipment at all: tailgating involves slipping behind an employee opening a secure door, taking advantage of their courtesy or a moment of inattention. This method exploits social engineering and human nature: few people would dare question someone who appears to be in their place. In a more direct version, piggybacking involves an intruder asking an employee to "hold the door" for him or her, on the pretext of an oversight or an emergency.

👁️‍🗨️ Observation furtve (Shoulder Surfing)

Visual spying involves observing a user entering a PIN code or password, or manipulating an access control system. This trick can be used to collect identification information, or to observe how a badge is used. It is all the more effective if reinforced by camera-equipped glasses or camouflaged recorders.

🎭 Social Engineering

Social engineering is one of the most formidable techniques of physical intrusion. It relies on the attacker's ability to himself as an authorized person: technician, trainee, delivery person or even manager. Thanks to a well-played role, sometimes accompanied by false papers, a ceremonial badge or appropriate attire, the intruder takes advantage of the spontaneous trust engendered by professional appearance. This method often enables access to sensitive areas without the use of force.

🗑️ Dumpster Diving

Dumpster diving remains a simple but highly effective method. Inspecting a company's garbage often uncovers sensitive documents, notes with passwords, or even accidentally discarded badges. This approach brings to light a good deal of internal negligence, such as the absence of secure destruction of confidential documents or inadequate sorting of office waste.

💾 USB Drop Attack

The USB flash drive attack consists of deliberately depositing an infected storage device in a location accessible to employees: parking lot, break room, elevator. If an employee connects it to his or her computer, the key can immediately malicious code, establish an external connection or extract information. This method exploits both human curiosity and the lack of rigorous IT security policies.

🎙️ Vocal imitation / Vocal deepfake

Thanks to advances in artificial intelligence, it is now possible to imitate the voice of an executive or employee from public recordings. A synthetic voice can be used to contact an internal department, validate an action, or request the opening of secure access. Combined with a physical intrusion or social attack, this imitation makes the whole operation extremely credible and difficult to thwart.

V/ Integration into Red Team operations

Physical intrusion goes far beyond a simple border violation or a quick security test. It is now a central strategic element of Red Team operations, which aim to simulate realistic, organized and diversified attacks against an organization. By incorporating this modus operandi into their scenarios, Red Team aims to expose the company to threats similar to those that could be launched by determined hostile groups, mixing physical and digital aspects.

🧩 Complementarity with digital attacks

With a global approach to simulation, Red Teams are no longer limited to exploiting software flaws or launching attacks on networks. Physical access becomes a crucial tool for triggering or intensifying a digital attack. For example, an intruder can pose as a technician, enter a building, connect malicious equipment to an internal network, steal a badge, or gain access to a normally secure server room.

Physical intrusion bypasses logical protections by attacking the hardware environment, human behavior or organizational weaknesses. It also offers the possibility of introducing spy devices, carrying out USB device attacks, or accessing sensitive data on unattended workstations. In this context, it becomes a means of transition: physical access is used to penetrate the digital network, test human and technical resilience, and evaluate the coordination between physical and IT security.

🏛️ A structuring regulatory framework: DORA and TIBER-EN

In a context where cyber threats are becoming increasingly complex and targeted, European regulators have put in place robust frameworks to improve the operational resilience of critical institutions, particularly in the financial sector. Today, two regulatory frameworks stand out: the DORA regulation and the TIBER-FR framework.

Visit DORA regulation (for Digital Operational Resilience Act), adopted by the European Union and coming into force in 2023, requires all players in the financial sector such as banks, insurance companies, cloud service providers and fintechs to implement concrete measures to protect themselves against risks linked to information and communication technologies. These include the obligation to report major incidents promptly, implement effective digital risk management and regularly check the robustness of their defense systems. These simulation exercises can include advanced Red Teaming operations, with the aim of confronting organizations with realistic and significant scenarios.

Visit framework TIBER-EU was specially designed to provide a framework for these tests. Developed at the instigation of the European Central Bank, then adapted for France under the name TIBER-FR, this methodological framework aims to harmonize Red Teaming practices throughout the European Union. It establishes a set of rules, roles and steps to ensure that tests are carried out ethically, securely and without disrupting the business of targeted entities.

One of the special features of the TIBER-FR framework is that it explicitly includes the possibility of carrying out physical intrusion scenarios, subject to prior validation. These intrusions can take the form of social engineering operations, aimed, for example, at gaining access to confidential premises to install a device or steal sensitive information. This approach, described in TIBER-EN guide on page 18, a fundamental development is the institutional recognition of physical risk as a critical attack vector, on a par with traditional cyber threats.

In practice, these tests can only be carried out within a rigorously defined framework: they must be planned, framed by an approved scenario, carried out by qualified service providers, and backed up by guarantees to prevent any damage or business interruption. This "threat-driven" approach meets DORA's requirements for simulating complex attacks, while maintaining a high level of control.

Today, the combination of DORA and TIBER-FR provides a coherent regulatory basis for integrating physical intrusion into Red Team strategies. It makes this practice part of a global resilience approach, aligned with the expectations of European supervisory authorities, and adapted to the operational realities of critical companies.

Conclusion: why is physical intrusion testing essential?

Including physical intrusion in a Red Team mission provides a concrete overview of an organization's security posture. Many digital incidents start with unauthorized physical access, often facilitated by a badge left unattended, a guessed digicode or a lack of human vigilance. Yet physical devices (access control, surveillance, procedures) are still audited less frequently than IT systems.

Assessing these weak points in a Red Team scenario helps to verify consistency between IT, physical and human security. It also fosters collaboration between teams, helps spot neglected areas and better predict hybrid threats that combine social engineering, physical penetration and cyber attack.