How to Spot a Spy: 3 Tips to Detect Secret Surveillance

There's no need for James Bond movies; spies still exist in modern life. According to many cybersecurity reports, there are millions of cases of surveillance, personal data theft, and corporate espionage occurring globally each year, and Vietnam is no exception. From cyber espionage, phone surveillance, hidden cameras, to being followed in real life—today's technology makes tracking others easier than ever.

Therefore, how to identify spies and the signs of being monitored are highly sought-after by users. This article will help you recognize common indicators when someone is tracking, monitoring, or collecting information about you or your business, thereby enabling you to proactively prevent, protect yourself, and safeguard important data before becoming a victim.

Tip 1: How to identify cyber espionage through virtual signs

Step 1: How to detect surveillance via a personal computer

Check your browser history regularly

• Open the browsing history on your preferred browser.

• Observe if there are any unfamiliar websites, pages you've never visited, or content unrelated to your daily usage habits.

• If your search history has been completely cleared and you're sure you didn't do it, this is a common sign that someone has accessed your computer without authorization.

• This usually happens when the tracker directly uses the computer to view your information, accounts, or personal data.

Protect your computer to prevent espionage

• Always turn off or lock your screen when not in use, even for a short period.

• Do not leave your computer on when you leave your desk or are unsupervised.

• This is a basic but very effective step to avoid being monitored and having your information stolen.

Set strong passwords to prevent unauthorized access

• Use passwords with uppercase letters, lowercase letters, numbers, and special characters.

• Avoid using overly simple passwords like birth dates, personal names, or easily guessed number sequences.

• You can combine them into a memorable but hard-to-guess structure, for example:

  • First letter of name + year + character + familiar service

  • Example: T2009@yahoo.com

• Strong passwords are a crucial line of defense that help you avoid computer espionage and personal data tracking.

Step 2: How to detect remote access surveillance software

Check third-party software running on your computer

• Open the list of active programs (Task Manager on Windows or Activity Monitor on macOS).

• Look for unfamiliar software that allows remote control of the computer, often referred to as remote access software or VNC.

• These programs allow others to view, control, and extract computer data from another location, as long as your computer is on and connected to the internet.

Identify common remote access software

• Some legitimate software often used for remote work includes LogMeIn or GoToMyPC.

• If you haven't installed or don't use these programs but still see them, this is a suspicious sign.

• If someone else obtains your login credentials, they can silently access your computer without your knowledge.

Actions to take when suspicious software is detected

• Immediately disconnect from the internet to limit external access.

• Uninstall remote access software if not needed.

• Change all computer and related account passwords.

• Scan for viruses and spyware to ensure no hidden tracking tools remain.

Step 3: An unusually slow computer might be under surveillance

Observe the device's operating speed

• If your computer or phone suddenly runs slowly, with delayed responses even for basic tasks, this could be a sign of surveillance.

• Tracking applications often run silently in the background, consuming RAM, CPU, and internet bandwidth.

• When resources are consumed, familiar actions like opening a browser, typing text, or switching windows will be noticeably slower.

Check applications running on the machine

• Open the task manager to view the list of active applications and processes.

• Pay attention to applications of unknown origin, with strange names, or that you don't remember installing.

• Many spyware programs are designed to run hidden, without displaying an icon but still consuming resources.

Use security software to detect tracking applications

• Reputable commercial antivirus programs can identify tracking software and spyware.

• Common tools like Symantec, McAfee, or Norton often effectively scan for suspicious background applications.

• It is recommended to update to the latest version and perform a full system scan to increase detection effectiveness.

Step 4: Check bills to detect surveillance

Review phone and regular service bills

• Carefully examine your mobile, internet, and other digital service bills.

• If you notice an unusual increase in data charges despite no change in usage habits, be especially cautious.

• Many phone tracking applications use GPS and internet continuously to send location data, causing data usage to increase faster than usual.

Beware of identity theft risks

• When someone gains access to your device, they often not only track you, but can also access other personal information such as accounts, emails, and payment data.

• This information can be exploited to impersonate you, register for services, or commit fraudulent acts without your knowledge.

• Unusual charges on bills are sometimes an early sign that personal data has been compromised.

Immediate actions to take when suspicious signs appear

• Check the list of applications using data, especially background apps.

• Uninstall unknown or unused applications.

• Change passwords for important accounts and enable two-factor authentication if available.

• Contact your network provider if you suspect unauthorized data consumption.

Step 5: Beware of downloading files from unsafe websites

Only download from trustworthy websites

• Before downloading any file, check if the website has credibility and security.

• Prioritize sites with HTTPS, clear domain names, and transparent information.

• Avoid downloading files from strange links, pop-up ads, or unknown websites.

Use a security system to check before downloading

• Always enable the built-in security features on your computer or browser to warn about unsafe websites.

• If the system displays a risk warning, do not proceed with downloading the file, even if it's "free" software.

• This is a simple but very effective step in identifying espionage and tracking software.

Understand the risks of downloading files from poorly secured websites

• Files downloaded from unsafe websites can contain spyware, malware, or tracking tools.

• Once installed, these programs can open the door for outsiders to access your device and collect personal data without your knowledge.

• Many surveillance cases begin with a single accidental file download.

Effective preventive actions

• Only download software from the developer's official website.

• Scan all files for viruses before opening or installing them.

• Immediately delete any files downloaded from suspicious websites.

Tip 2: How to effectively detect corporate espionage

Step 1: Recognize corporate espionage within the company

Clearly define the company's important information

• List high-value data that competitors might be interested in.

• This often includes:

  • Product research, new technologies

  • Business strategies, expansion plans

  • Financial reports, balance sheets

  • Customer lists, partners, suppliers

• These are all common targets in corporate espionage.

Control who has access to information

• Clearly define who is allowed to view, edit, or copy each type of data.

• Check if any personnel, collaborators, or accounts:

  • Are no longer responsible for related tasks

  • But still have access to sensitive data

• Inappropriate access is a major vulnerability in corporate security.

Identify signs of unusual access

• Someone views or downloads information that is not relevant to their job.

• Important data is opened, copied, or shared at unusual times.

• Internal information appears outside the company or falls into the hands of competitors.

Actions to prevent corporate espionage

• Grant access permissions according to job roles.

• Monitor the access history of important data.

• Revoke access immediately when personnel change positions or leave the company.

• Raise internal awareness on how to identify espionage and protect company information.

Step 2: Distinguish between legal and illegal corporate espionage

Understand the boundary between legal and unlawful conduct

• Not all activities involving the collection of information about a business are criminal.

• Most corporate espionage incidents begin with researching publicly available information, accessible to everyone, such as:

  • Personnel lists on websites or LinkedIn

  • Upcoming events, sales programs, recruitment drives

  • Organizational structure changes, branch openings, leadership changes

• These actions may pose risks to the business, but do not violate the law.

Corporate espionage acts considered illegal

• Only when there is an illegal element can authorities proceed with handling the case.

• Violations often include:

  • Fraud, identity impersonation

  • Unauthorized intrusion into systems or offices

  • Theft of internal documents, data

  • Unauthorized copying or theft of information

• These are the actions that constitute illegal corporate espionage.

Risks from employees' personal social media

• Employees sometimes unintentionally share too much information on their personal social media.

• For example:

  • Photos of activities in the office

  • Information on ongoing projects

  • Changes in job positions, new roles

• This data is completely legal to collect, but extremely valuable to corporate spies.

Practical approach to risk prevention

• Train employees on sharing information on social media.

• Clearly define what information is public and what needs to be protected.

• Actively control images and data related to the business in the digital environment.

Step 3: Identify strangers appearing in the office

Observe unfamiliar faces

• Notice if there are people in the building or office whom you have never met or do not recognize.

• In many businesses, with a large and frequently changing workforce, strangers can impersonate employees, following others to gain access to work areas.

• This "piggybacking" behavior is a common way to infiltrate internally without a badge or authentication.

Distinguish vigilance from personal speculation

• Observing strangers is only to identify those who are not authorized to be present, not to confront or conclude on your own.

• Avoid direct confrontation if the situation is unclear, as it could be a guest, partner, or new employee.

Follow proper security reporting procedures

• Businesses need to have clear regulations for handling internal security incidents.

• When detecting unusual signs:

  • Report immediately to security, reception, or direct manager

  • Provide a brief description of the stranger and the area where they were seen

• Following the correct procedure helps reduce risks and avoid improper handling.

Step 4: Detect unusual behavior and the risk of corporate espionage

Monitor unusual access activities

• Observe personnel's work habits and data access over time.

• Pay attention when someone:

  • Accesses more files than usual compared to their job role

  • Opens sensitive data not directly related to their tasks

  • Logs into the system from unusual locations, such as from home or outside working hours

• These signs may indicate that information is being collected for illicit purposes.

Recognize risks from corporate dumpster diving

• Dumpster diving is a simple but effective way to retrieve company information.

• Discarded printed documents, drafts, invoices, and internal notes can all contain valuable data.

• If you see someone who is not an employee rummaging through company trash, this is a sign to be wary of.

Practical actions to reduce the risk of information exploitation

• Monitor and record unusual data access behaviors.

• Restrict remote access to important data if not necessary.

• Properly shred paper documents before discarding them.

• Report any suspicious signs immediately to the relevant department.

Step 5: Recognize espionage through social engineering tactics

Beware of information exploitation through communication

• Most corporate espionage cases don't require high technology, but rather start with conversations and leading questions.

• Imposters may:

  • Call claiming to be a company employee

  • Say they forgot their login or password

  • Apply pressure, urge, or subtly threaten you to provide information

• Questions that seem "harmless" but delve into internal processes, systems, or data should all be treated with caution.

Identify common phishing tactics

• Bad actors may impersonate IT, HR, or technical departments.

• They may ask for:

  • Passwords, authentication codes

  • Account information, company email

  • System access

• A key principle in identifying espionage is:

  • Do not share sensitive information just because the person asking "sounds familiar" or "knows someone familiar."

Train employees to recognize signs of espionage

• Employees need to be instructed to identify:

  • Unusual leading questions

  • Pressuring, rushing, or intimidating attitudes

  • Requests to bypass procedures due to "emergencies"

• These are common social cues in espionage and internal information theft cases.

Adhere to the company's information security procedures

• Businesses need clear procedures for sharing sensitive data.

• If someone requests information that does not follow standard procedures, it is a serious warning sign.

• Employees should:

  • Temporarily stop providing information

  • Verify through official channels

  • Report to the security department or direct management

Tip 3: How to identify someone tracking you

Step 1: Be wary of being followed when moving outdoors

Always pay attention to your surroundings

• When out, avoid walking with your eyes glued to your phone or wearing headphones for too long.

• Distraction makes it difficult to notice someone following or observing you.

• Stalkers often take advantage of your inattention to approach without being noticed.

Identify signs of being followed in real life

• Someone appearing repeatedly in multiple locations you visit.

• Someone maintaining a fixed distance behind you for a long time.

• A person stopping when you stop, and continuing when you continue.

• These are common signs in how to recognize a spy or being personally followed.

Simple habits to reduce the risk of being followed

• Occasionally look behind and around naturally.

• Change your route or pace if something feels off.

• Prioritize walking in crowded, well-lit areas.

• Only use your phone when absolutely necessary.

Step 2: How to detect being followed by car

Observe unusual recurring vehicles

• Pay attention to cars with simple, inconspicuous designs, as followers often avoid overly flashy vehicles.

• Watch for vehicles that appear multiple times on your route, especially after you've made several turns or stops.

• Additionally, be wary of acquaintances' cars if they have a reason to follow you.

Check the reaction of suspicious vehicles when you change behavior

• If driving, gently slow down and observe if the vehicle behind does the same.

• On major roads or highways:

  • Change lanes appropriately

  • Observe if that car also changes lanes

• Repeated tailing is a significant sign in how to recognize being followed in real life.

Identify characteristics of a tailing vehicle

• Tailing vehicles are often:

  • Neutral colors

  • Common models, easily blending into traffic

• If suspicious, remember:

  • License plate number

  • Car color

  • Distinguishing features (scratches, accessories)

• These details are very useful if you need to report or verify later.

Safe actions when suspecting being followed

• Do not confront directly.

• Move to a crowded area or an area with security forces.

• Stay calm and continue observing naturally.

Step 3: How to detect hidden cameras in a room

Carefully observe unusual small details

• Hidden cameras are now very small and easily disguised in familiar objects.

• Pay attention to:

  • Small items appearing out of place or with no clear purpose

  • Unusual small holes on power outlets, clocks, smoke detectors, decorative items

  • Loose wires or not clearly connected to any device

• These "out of place" details are often early signs in how to recognize spies using surveillance cameras.

Use your phone to detect infrared cameras

• Turn off all lights in the room to create a completely dark space.

• Open the camera on your phone and scan the room through the screen.

• Night vision cameras often emit red infrared light to see in the dark.

• If you see unusual red glowing dots on your phone screen, it's highly likely to be a hidden camera.

Use specialized camera detectors

• There are compact, easy-to-use hidden camera detectors on the market.

• These devices emit high-frequency red light to scan the space.

• When light reflects off:

  • Lens

  • Camera chip

  • Infrared light
    it's highly probable there's a hidden recording device in the room.

Actions to take when a suspicious camera is found

• Do not touch or remove it immediately if the origin is unclear.

• Record the location and images, and disconnect from the internet if possible.

• Report to the landlord, building management, or authorities when necessary.

Step 4: How to detect listening devices around you

Note unusual sounds during phone calls

• If you still hear static, strange noises, or prolonged background sounds after hanging up, be especially vigilant.

• These signs sometimes appear when a listening device or call monitoring software is active.

• While not always espionage, this is a signal not to be overlooked in how to recognize being monitored.

Observe interference phenomena on electronic devices

• Listening devices can cause signal interference to surrounding devices.

• Pay attention if:

  • TV suddenly experiences signal interference, strange noises

  • Radio produces unusual static when not in use

  • Electronic devices operate erratically even with normal power

• This could be a sign that unfamiliar signals are being transmitted or received in the space.

Practical actions when suspecting being listened to

• Do not discuss sensitive information over the phone without verifying safety.

• Turn off suspicious devices and observe if the interference persists.

• Check around power outlets, fixed objects, and places where listening devices are easily hidden.

• Seek professional or technical assistance if the signs persist.

Step 5: Detect tracking devices via strange Wi-Fi networks

Check for unusual Wi-Fi networks

• Open the Wi-Fi list on your phone or laptop to see available networks.

• If you detect a strong Wi-Fi signal right in your home that you didn't set up, pay close attention.

• Surveillance devices like hidden cameras and voice recorders often use Wi-Fi to transmit data externally.

Identify Wi-Fi signs related to tracking devices

• Strange network name, not resembling your home or neighbor's network.

• Unusually strong signal even though no corresponding router is visible.

• The network appears continuously even after you've turned off your own Wi-Fi emitter.

• These are common signs in how to recognize spies using wireless devices.

Actions to take when suspicious Wi-Fi is detected

• Change your Wi-Fi password and update router security immediately.

• Check devices currently connected to your network.

• Turn off suspicious devices in the room and see if the Wi-Fi signal disappears.

• Combine with checking for hidden cameras and listening devices if the signs persist.

Important notes if you suspect you are being monitored

Understand being monitored at work

• Many businesses monitor employees' computer activity and web access to ensure security and productivity.

• Therefore, being monitored during work hours is not necessarily espionage.

• It's important to distinguish between legitimate corporate surveillance and illegal, unauthorized stalking.

Educate yourself to identify spies

• Reading books and articles on espionage and counter-espionage helps you understand:

  • How stalkers observe and collect information

  • Common behaviors used to conceal their presence

• Much of the knowledge in these materials can be directly applied to recognizing real-life spies.

Prioritize personal safety when there are signs of threat

• If you are:

  • Constantly followed

  • Threatened

  • Extorted or harassed
    then seek immediate assistance from authorities.

• These behaviors may not be related to espionage, but personal safety is always the highest priority.

Understand common stalker behavior

• Stalkers often try to blend into the crowd, avoiding attention.

• They dress, move, and behave like ordinary people to avoid detection.

• This "overly normal" behavior can sometimes be a sign to watch out for when trying to tell if you are being followed.

Tip for observing natural reflexes to detect a follower

• If you suspect someone is observing you at close range, try to yawn naturally.

• Yawning is contagious, and someone focusing on you might unconsciously yawn along.

• This is not definitive proof, but it's a small trick to help you further confirm your suspicions.

References

1. http://www.online-tech-tips.com/computer-tips/how-to-detect-computer-email-monitoring-or-spying-software/
2. http://www.welivesecurity.com/2015/01/29/how-to-spot-a-tracking-app/
3. http://www.computerworld.com/article/2551898/security0/how-to-spot----and-stop----a-spy.html
4. http://www.investopedia.com/financial-edge/0310/corporate-espionage-fact-and-fiction.aspx
5. https://www.computerworld.com/article/1684558/how-to-spot-and-stop-a-spy.html
6. https://venturebeat.com/security/detecting-if-someone-is-spying-on-you-or-tailing-you/
7. https://www.rosen.com/spouse-spying/spying-articles/spousal-spying-details/
8. http://www.deccanchronicle.com/150408/technology-latest/article/how-spot-hidden-cameras
9. http://www.brickunderground.com/blog/2014/11/apartment_surveillance
10. https://www.rosen.com/spouse-spying/spying-articles/spousal-spying-details/
11. https://venturebeat.com/security/detecting-if-someone-is-spying-on-you-or-tailing-you/

Translator: Rene Lee Nguyen.