What is spear phishing?

THE spear phishing is a form of targeted phishing, in which attackers send emails or messages specifically tailored to a person or organization. Their goal is to steal confidential information or introduce malware. Unlike classic phishing, spear phishing relies on personal data concerning the victim, which makes the message particularly credible and difficult to detect.

What is spear phishing?

The principle of phishing is simple: scammers create fake emails, deceptive websites and sometimes even fake short messages that appear authentic, in order to trick users into providing their login information. In this way, cybercriminals obtain login credentials for online shopping, social media or Cloud storage accounts.

Spear phishing is a more targeted form of phishing. Instead of targeting a broad audience, as is the case with unwanted emails (spam), attackers select their victims carefully. With specific information about their target, they can design messages and websites that look very credible. If preparation requires more effort, the success rate is also higher.

Spear phishing targets specific people and adapts the fraud attempt to each target. These attacks generally mainly affect businesses and organizations. The perpetrators are not always simple opportunistic crooks: some seek to specifically harm a structure (theft of banking data, industrial espionage, or even cyberattacks targeting sensitive infrastructure).

Before the attack, the fraudsters “spy” on the target to collect information that will strengthen the credibility of their message. They then compose a carefully personalized email, often allegedly sent by a known authority or business partner. In large organizations, where the internal structure is less familiar to employees, this approach is even more effective: the victim is lured into disclosing sensitive information or downloading malware.

Short definition: Spear phishing is a form of targeted phishing that relies on gathering information, personalizing the message and exploiting trust in order to gain sensitive access or cause damage to an organization or individual.

Spear phishing explained with an example

Let's imagine that a hacker chooses a large multinational as his target. It starts with collect a large amount of relevant information : the structure of the company, its internal communication channels, its areas of activity, or even the email addresses of employees. This data makes it possible to design a precise and credible attack.

The attacker will not send their message to the entire company, as this would increase the risk of being detected; rather, he carefully selects a few people.

Thanks to the information collected, generally obtained on social networks, the message appears highly credible. It appears to come from a manager at another subsidiary or business partner. The sender's name, email address and signature are falsified to reinforce the illusion.

The email contains a link or button that redirects to a fake website. When the victim clicks on it, a malware can be downloaded in the background. Once installed on the computer, this malware allows the attacker to spy on the internal network or manipulate sensitive data.

The victim thinks they simply visited a legitimate site or took a survey. During this time, the virus quietly spreads throughout the company's network, giving the attacker full access or the ability to disrupt critical processes.

Tip #1: Stay skeptical

The best protection against spear phishing is based on good dose of skepticism. Avoid clicking on unfamiliar links or opening unexpected attachments. The danger comes from the fact that these attacks, unlike classic phishing emails, are very well designed. While regular spam emails are easily recognized by their language mistakes or absurd requests, spear phishing messages appear serious, coherent and authentic.

Tip #2: Keep a cool head

Cybercriminals exploit human weaknesses, including curiosity and fear. Those who fear missing important information or an opportunity tend to act impulsively. Spear phishing messages play on these emotions: some promise a professional advantage, others use an authoritative tone to create a sense of urgency and encourage action without thinking.

Tip #3: Protect Sensitive Data

Spear phishing only works if attackers have sufficient information about their victims. THE social media profiles are often their first source. Avoid disclosing sensitive personal or professional details there. Scammers can also use Social Engineering to obtain more information. Golden rule: never share confidential data with strangers, even if the contact seems credible.

Tip #4: Check the sender in the sending protocol

A fraudulent message can in most cases be identified by examining the sender's real address. In the case of emails, it is useful to display the complete sending protocol. Even if the name or address displayed is falsified, the address authentic appears in the technical headers of the message. Many email clients, such as Outlook or Thunderbird, hide this information to only show a display name, but it is possible to display the header of an email. If the source differs from the apparent sender, the message is likely fraudulent.

Tip #5: Avoid HTML and Automatic Image Uploading

An effective security measure is to disable HTML display and prevent images from loading automatically in emails. This greatly reduces the risk of malware being executed or downloaded as soon as the message is opened.

Tip #6: Do not open unknown attachments

Attachments from unknown senders should not Never be opened without prior verification. First make sure to confirm the identity of the sender. Even if it seems reliable, don't download files you didn't expect to receive. It is possible that the known person's computer is already infected with malware. If in doubt, contact the sender through another channel to confirm the legitimacy of the message.

Tip #7: Examine URLs and Links Carefully

Be careful with Internet addresses embedded in emails. Hover over a link to view theaddress real before clicking. Cybercriminals often use spoofing of URLs to make a fraudulent domain look like a legitimate address. Also be wary of shortened links: if possible, restore their original form or avoid them altogether.

Tip #8: secure the email address against falsification

In addition to individual best practices, the technical configuration of the mail server plays a key role in protection against spear phishing. The SPF, DKIM and especially DMARC protocols allow you to verify the authenticity of senders and to prevent fraudulent use of a domain. These measures help businesses block spoofed emails sent in their name.