What Is Phishing and How Does It Work?

Learn what phishing is, how phishing works, how to prevent phishing.

This article is from The Defender's Handbook:

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Introduction

Ever since internet usage for the average person became a lot more widespread in the late 1990s, phishing attacks have remained one of the most prevalent and dangerous threats to both individuals and organizations. There’s a pretty clear explanation for it: Unlike other cyber threats, phishing doesn't necessarily rely on computer vulnerabilities—it relies more on human vulnerabilities. In other words, it involves more of a psychological approach.

To make matters worse, the growing shift to remote work since the COVID-19 pandemic has made it easier for threat actors to exploit unprotected networks. Email, social media, and messaging platforms give attackers tons of opportunities to disguise themselves as legitimate entities in hopes of fooling victims.

As more people fall for these scams, cybercriminals continue to refine their techniques —making phishing a go-to attack method for those looking to steal sensitive information or gain unauthorized access to systems.

Read on to learn:

  • What phishing is and how it works
  • How hackers infiltrate environments through phishing attacks
  • How phishing as a service (PhaaS) works
  • How phishing spreads within an organization
  • How to prevent phishing attacks

Common Questions About Phishing

Phishing is one of the most common and dangerous cyber threats, targeting individuals and organizations through deceptive emails, messages, and websites. This section addresses common questions about phishing, how to identify it, and effective ways to stay protected from these malicious schemes.

What is phishing?

Phishing is a type of cyberattack where threat actors disguise themselves as legitimate entities to trick users into revealing sensitive information, such as passwords, credit card numbers, or personal details. Read more

How does phishing work?

Phishing is when an attacker sends emails or other messages that appear to come from trusted sources. These emails and messages contain malicious links or attachments. When a recipient clicks on a link or downloads an attachment, they are redirected to a fake website that mimics a legitimate one, prompting them to enter their credentials or other sensitive information. Read more

How does phishing spread within an organization?

Phishing can spread within an organization through compromised accounts. Once a threat actor gains access to one account, they can use it to send phishing emails to other employees, increasing the likelihood of further breaches. Read more

How can I detect phishing?

Phishing can be detected by scrutinizing communications for signs of fraud, such as unfamiliar sender addresses, generic greetings, spelling errors, and unexpected attachments or links—anything that looks fishy. Security tools like email filters and phishing simulation software can also help identify and block phishing attempts. Read more

How can I prevent phishing?

Preventing phishing involves a combination of user education and technical defenses. Key prevention measures include training employees to recognize phishing attempts, using multi-factor authentication (MFA), and deploying email security solutions. Read more

How does phishing as a service work?

Phishing-as-a-Service (PhaaS) is a business model that enables threat actors to purchase phishing kits and services from other cybercriminals. This allows even those with limited technical skills to launch sophisticated phishing attacks. Read more

How Do I Respond To A Phishing Attack?

If you suspect a phishing attack, do not click on any links or open any attachments. Report the email to your IT or security team immediately. They can help you verify the legitimacy of the email and take steps to mitigate any potential damage. Read more

Does antivirus software stop phishing?

Antivirus software can help detect and block malicious attachments and links, but it may not catch all phishing attempts, especially those that rely on social engineering rather than malware. Read more

Should I reveal personal information in response to a suspicious email?

No, you should never reveal personal information in response to an unsolicited or suspicious email. Always verify the authenticity of the request by contacting the organization directly through official channels. Read more

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What is Phishing?

Phishing is a type of cyberattack where attackers disguise themselves as legitimate entities to trick individuals into revealing sensitive information. This information can then be used for malicious purposes, such as identity theft, financial fraud, or unauthorized system access.

Key Phishing Terms
Credential Harvesting

Collecting users' login credentials through deceptive means.

Phishing Kit

A set of tools and resources that cybercriminals use to create and launch phishing attacks.

Deceptive Phishing

Phishing attacks that use fake websites or emails to trick users into revealing personal information.

Spear Phishing

A targeted phishing attack aimed at a specific individual or organization.

Pharming

Redirecting a legitimate website's traffic to a fake website to steal information.

Whaling

A type of phishing attack targeting high-profile individuals, such as executives or public figures.

How Does Phishing Work?

Phishing attacks typically involve sending deceptive emails, texts, social posts, instant messages, etc., that appear to come from trusted sources. These communications often contain malicious links or attachments. When a recipient clicks on a link, they are usually redirected to a fake website that prompts them to enter their credentials or other sensitive information for the hacker to steal. Another tactic is via a malicious attachment; opening an attachment may download malware onto the victim's device.

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How Do Hackers Execute Phishing Attacks?

Hackers can infiltrate an environment in several ways. Here are a few common methods:

Phishing emails are the most prevalent method for hackers to gain access to an environment. These emails often appear to come from trusted sources and contain links or attachments designed to steal information or install malware.

Social engineering involves manipulating individuals into performing certain actions or divulging confidential information. Phishing emails often use social engineering tactics to create a sense of urgency or trust.

Once attackers get a list of stolen credentials, they use automated tools to try these credentials on multiple sites, exploiting the ever-so-common practice of reusing the same password(s).

Attackers can use social media platforms to create fake profiles or hijack existing ones, sending messages that appear to come from trusted friends or colleagues.

Hackers can create fake websites that mimic legitimate ones. When victims enter their information, it gets sent directly to the attackers.

What Is Phishing as a Service (PhaaS)?

Phishing-as-a-Service (PhaaS) is a business model that enables cybercriminals to purchase phishing kits and services from other attackers. These kits include all the tools needed to launch a phishing campaign, making it easier for less skilled attackers to execute sophisticated attacks.

What Are Some Examples of Real-Life Phishing Attacks?

  1. Google Docs Phishing Scams: In this attack, users typically receive an email inviting them to view a document on Google Docs. When they click the link, they are taken to a fake Google login page designed to steal their credentials.
  2. PayPal Phishing: Attackers send emails claiming to be from PayPal, warning users of suspicious activity on their accounts. The email includes a link to a fake PayPal login page where users are prompted to enter their credentials.
  3. COVID-19 Phishing Scams: During the pandemic, cybercriminals exploited the crisis by sending emails claiming to offer health advice, government aid, or vaccination appointments. These emails often contained links to malicious websites or requests for personal information.
  4. Business Email Compromise (BEC): In BEC attacks, cybercriminals impersonate company executives or vendors and request fraudulent wire transfers. These highly targeted attacks can result in massive financial losses.

Can Phishing Attacks Be Prevented?

Phishing attacks can be prevented through a combination of technical defenses and user education. Here are some key measures:

  1. Email Security Solutions: Deploy email security solutions that can filter out phishing emails before they reach the inbox.
  2. Multi-Factor Authentication (MFA): Use MFA to add an extra layer of security to user accounts. Even if credentials are stolen, MFA can prevent unauthorized access.
  3. Security Awareness Training: Educate employees on how to recognize phishing attempts and the importance of verifying suspicious emails.
  4. Regular Software Updates: Keep software and systems updated to protect against known vulnerabilities that phishing attacks may exploit.
  5. Layered Security Tools: Deploy an EDR (Endpoint Detection and Response) solution and antivirus software to detect and mitigate phishing threats.

Read our full exploration of How to Prevent Phishing Attacks.


How to Respond to a Phishing Attack

If you suspect you’ve been targeted by phishing or discover a phishing attack in progress, take the following steps immediately:

  1. Do not interact with the suspicious email or message.
  2. Report the email to your IT or security team.
  3. Run a full scan of your device using security software.
  4. Change your passwords immediately if you suspect they have been compromised.
  5. Monitor accounts for any signs of unauthorized access or activity.

A History of Phishing

Phishing has evolved a lot since it first emerged as a cyber threat. While the core concept remains the same, phishing methods are always adapting and evolving to newer technologies and platforms.

The Early Days

The first recorded phishing attacks occurred in the mid-1990s when attackers targeted AOL users with fake emails asking for their login information. Known as "AOHell," these attacks involved mass emails from supposed AOL support, urging users to verify accounts by providing passwords. The novelty of the internet and users' unfamiliarity with tactics like this meant a lot of people were duped by these them and set the stage for future cybercriminal threats.

The Evolution

Over time, phishing attacks have become more sophisticated. Cybercriminals now use advanced methods such as spear phishing and whaling, targeting specific individuals or high-profile victims. Spear phishing involves highly personalized emails, often containing information about the victim, while whaling targets executives or key figures within organizations, aiming for higher-value data. Plus, with the rise of new technologies like social media and SMS texts, hackers have even more ways to gather information and launch attacks. For instance, they can now exploit platforms like LinkedIn or Facebook to learn more about potential victims and use SMS messages for targeted phishing, making it easier to impersonate trusted contacts or organizations and increase the likelihood of success.

Today’s Threat Landscape

Modern phishing attacks often involve incredibly convincing emails and websites that are almost indistinguishable from legitimate ones. Attackers can use advanced social engineering tactics, like spoofing email addresses and creating realistic-looking websites, to increase their chances of success. 

Now, with AI tools in the mix, phishing is becoming even more dangerous. AI can help craft emails that perfectly mimic writing styles or generate personalized messages at scale, creating attacks that are far more convincing and harder to spot. This technology enables cybercriminals to automate and refine their techniques, making it easier than ever to trick even the most vigilant individuals.

‍Phishing Detection

Can Antivirus Detect Phishing?

Antivirus software can help detect phishing emails by identifying known malicious attachments and links. However, it may not be effective against new or highly sophisticated phishing attacks that use social engineering rather than malware.

What to Do if You Discover a Phishing Attack in Progress

If you discover a phishing attack in progress:

  1. Disconnect from the network to prevent further compromise.
  2. Report the incident to your IT or security team immediately.
  3. Conduct a full security audit to identify any potential breaches.
  4. Educate employees on recognizing and reporting phishing attempts.


Want to Learn More about Preventing Phishing Attacks?

Huntress Managed EDR can help detect and mitigate phishing attempts with advanced threat detection and response capabilities. In addition to endpoint monitoring, we offer expert-led security awareness training that teaches individuals how to spot cyber threats like phishing attempts and stop hackers from even getting a foot in the door.

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Additional Resources

Additional Resources
Phishing in the Fast Lane: The Attacker’s Eye View
Additional Resources
Mistakes to Mastery: Get to Know Phishing Defense Coaching from Huntress SAT
Additional Resources
Effortless Phishing Simulations Now Part of Huntress Security Awareness Training
Additional Resources
Phishing Solutions
Solutions
Additional Resources
Phishing Training with Huntress
Product
Additional Resources
Phishing in the Fast Lane: The Attacker’s Eye View
Blog Post
Additional Resources
Teach Yourself to Phish: The Strategy Behind Phishing Simulations
Blog Post
Additional Resources
Phishing Guidance: Stopping the Attack Cycle at Phase One (CISA.gov)
External Link
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