Phishing: Complete guide to understanding and protecting yourself against this cyber threat

In an increasingly connected world, the threat of phishing stands as a major challenge for both individual and collective cybersecurity. Since the beginnings of online scams in the 1990s, this sophisticated form of fraud has undergone rapid evolution, continuously adapting to technological innovations and internet users’ behaviors. In 2025, more than 500,000 French people fell victim to cyberattacks, the majority resulting from fraudulent emails representing phishing attempts. Faced with this resurgence, better understanding the mechanisms of this threat has become essential to ensure the protection of sensitive data, whether personal or professional.

Phishing exploits the trust given to recognized entities and often plays on the fear or urgency felt by victims, inviting them to disclose confidential information. Whether it’s an email appearing to come from your bank or a message asking you to update your payment details, vigilance is necessary. The increasing sophistication of attacks, notably through advanced kits accessible on the dark web, allows less technical actors to launch massive campaigns with alarming efficiency.

From the original evolution of phishing in the 1990s to the growing impact associated with the democratization of cryptocurrencies and the global health crisis, this phenomenon is now a key issue in cybersecurity. We offer here a comprehensive overview, including concrete examples, precise classifications, as well as adapted advice for prevention and awareness. Let’s explore together the different facets of this digital trap to better guard against it.

Phishing: understanding its origins and historical evolution

The term “phishing” originates from the mid-1990s, derived from the English word “fishing.” This metaphor perfectly illustrates cybercriminals’ strategy: just as a fisherman uses bait to catch a fish, the scammer uses a fraudulent email or message to entice the victim to “bite” by revealing their confidential information.

The first phishing campaigns targeted AOL (America Online) users, then a very popular internet service provider. Hackers used software like AOHell to automatically generate these attacks, targeting passwords and using algorithms to create random credit card numbers. These fake cards were then used to open fraudulent accounts, facilitating access to more targets. Although the success rate was initially low, the economic impact was quickly felt.

Over time, tactics became more sophisticated. As early as 2001, more targeted attacks against online financial systems, such as E-Gold, appeared. Then, in 2003, customers of platforms like eBay and PayPal became the preferred new victims. Fraudulent emails impersonated legitimate requests to update personal data, allowing scammers to steal usernames and passwords. This phenomenon intensified the following year with a significant spike in attacks directly targeting banking sites and their clients, causing losses estimated at nearly one billion dollars in the United States in less than a year.

Cryptocurrencies could have curbed this threat thanks to their blockchain technology based on cryptography. However, phishing adapted and even takes advantage of these digital currencies to carry out frauds that are harder to trace. Specialized phishing kits are offered on the dark web, making this method accessible to a wide range of cybercriminals, regardless of their technical expertise.

The emergence of the Covid-19 crisis triggered a real explosion of phishing attempts. Many users, seeking official information and directives, were trapped by emails claiming to come from government institutions or their employer. These massive campaigns of fraudulent emails exploited fear and uncertainty in the context to rapidly spread malicious software.

The different forms of phishing: typologies and strategies used by cybercriminals

Phishing is not a homogeneous threat. There are several variants, each aimed at a specific objective. These attacks are mainly classified according to their purpose: either to obtain confidential information or to infect a device with malware. Knowing these distinctions helps better understand the risks and adjust defenses.

Theft of sensitive information via fraudulent emails

This type of attack relies on sending a message inviting the victim to click on a link or log into a fake website imitating that of a bank, payment platform, or known IT service. Once the credentials are collected, hackers can access bank accounts, messaging services, or online shopping platforms. This modus operandi is used in the majority of phishing cases.

The key lies in the appearance of the email, often very convincing, sometimes with the signature of a recognized company, an official logo, or even a fake security certificate. However, these emails often contain clues such as generic greetings (“Dear Customer”) or unusual spelling mistakes.

Downloading malware hidden in attachments

Sometimes, the fraudulent email contains files to download, disguised as legitimate documents (PDFs, ZIP files, Word documents). Upon opening, malware — often ransomware — installs itself on the device, blocking access to personal or professional data until a ransom is paid. This type of threat represents a significant share of attacks detected in enterprises in 2025.

Ransomware perfectly illustrates this threat: in 2017, it accounted for 93% of phishing attacks via attachments. Today, variants targeting organizations or individuals even more precisely, through spear phishing, have developed. Whale phishing, another more sophisticated version, targets top executives by impersonating their personal identity to carry out major financial scams.

Comparative table of the main types of phishing

Type of phishing	Main objective	Common method	Target victim	Concrete example
Classic phishing	Obtaining sensitive information	Email with link to fraudulent site	General public	Request to update bank password
Spear phishing	Targeted scam	Personalized email with real context	Specific employees	Urgent transfer request from a fake colleague
Whale phishing	High-stakes fraud	Impersonation of executive identity	Executives, senior managers	Fake CEO email requesting bank transfer
Phishing by attachment	Malware installation	Infected attachment (.zip, .doc)	All users	Ransomware in a Word document

Detecting a fraudulent email: warning signs to enhance IT security

Prevention essentially relies on everyone’s ability to identify a suspicious email before interacting with it. Vigilance is all the more crucial as cybercriminals master the art of spoofing, which consists of impersonating a person or organization to make the fraud more credible.

Check the sender: A familiar name is never a guarantee. Always examine the email address carefully, paying attention to anomalies such as an unusual extension (e.g.: .ru, .xyz) or a slight alteration of the name (e.g.: micorsoft.com instead of microsoft.com).

Impersonal greetings: A message beginning with “Dear Customer” or “Dear User” without mentioning your exact name should raise suspicion.

Urgency and threats: The feeling of urgency is a classic phishing tactic. A message pressuring you to act quickly, under threat of account closure or sanctions, should encourage caution.

Spelling or grammatical errors: Frequent and gross mistakes are clues of an unprofessional or fraudulent email.

Requests for sensitive information: No legitimate organization will ask you for your password or bank details by email.

Suspicious links and buttons: Hover your cursor over links without clicking to check the actual address. Beware of truncated URLs or those not matching the official site.

• Never click directly on an unsolicited link or attachment.
• Contact the concerned organization directly using a known phone number or address.
• Regularly update security software and operating systems.
• Use complex passwords and two-factor authentication for protection.
• Train and raise awareness among users about phishing risks.

The impacts of phishing on data protection and personal security

The scope of phishing goes far beyond the simple financial loss to the initial victim. When a hacker manages to steal credentials, they often open the door to violations of personal data protection, causing a domino effect with devastating consequences at both individual and organizational levels.

In the personal sphere, a compromised account can lead to identity theft, intrusion into private correspondence, or the usurpation of social media profiles. These situations generate significant stress, loss of trust, and sometimes legal repercussions related to misuse of stolen information.

From a business perspective, attackers exploit this data to access sensitive infrastructures, steal trade secrets, or disrupt business continuity. In 2025, financial losses related to phishing are estimated at several billion euros worldwide, with a direct cost to organizations often accompanied by lasting reputational damage.

Awareness of cybersecurity is therefore necessary not only as an individual response but also collectively. Regular training, strict policies on information access, and a reasoned distrust culture regarding unsolicited emails are key elements to limit damage.

Moreover, the implementation of technical measures such as systems for detecting fraudulent emails, securing mail servers, and the systematic use of the DMARC protocol contribute to strengthening overall IT security. The adoption of encrypted cloud storage solutions, such as pCloud or Google Drive, ensures reliable data backup against increasing digital risks.

Prevention and awareness agenda for better fight against phishing

Effectively combating phishing requires a multidimensional approach, combining education, technological tools, and responsible behaviors. One of the first steps is to make essential knowledge about this threat accessible to all. This involves regularly disseminating awareness messages targeting both individuals and professionals.

Training programs play a major role. For example, a company can organize phishing attack simulations to test employee reactions and strengthen their reflexes. These practical exercises are valuable for understanding the mechanisms of phishing in a secure and risk-free environment.

Companies are also encouraged to adopt a clear policy on managing sensitive emails. Integrating specific tools capable of identifying and blocking fraudulent emails before they reach the inbox greatly reduces exposure.

Finally, users themselves must adopt a daily cybersecurity culture: never share passwords, prioritize two-factor authentication, and be vigilant against email solicitations. These practices minimize the risks of compromising personal data and information systems.

• Participate in awareness workshops and seminars.
• Implement an IT charter within organizations.
• Use anti-phishing tools and keep software up to date.
• Use VPN solutions to protect Internet connections.
• Report any suspicious email to IT teams or competent authorities.

This collective approach improves not only individual protection but also overall resilience against the rise of cyberattacks. As cybercriminals continuously perfect their strategies, awareness remains the primary defense against these new forms of online fraud.