What Is a Phishing Attack? Types, Examples, and How to Stop Them

The attacker selects their targets — either broadly (mass phishing campaigns sent to millions) or narrowly (spear phishing aimed at a specific individual or organisation). For targeted attacks, the attacker researches their victim on LinkedIn, company websites, press releases, and social media to gather details that will make the lure convincing.

The attacker builds the deceptive message and any supporting infrastructure — a spoofed email address, a cloned website, or a lookalike domain (for example, paypa1.com instead of paypal.com). AI tools are now widely used to generate grammatically perfect, contextually accurate phishing content at scale and at minimal cost.

The phishing message is sent via email, SMS, phone call, social media direct message, or collaboration platforms like Microsoft Teams or Slack. Mass campaigns send millions of messages simultaneously; targeted spear phishing campaigns may send a single, precisely crafted email to one person.

The victim clicks a link, opens an attachment, or responds with sensitive information. A phishing link typically redirects to a spoofed login page that captures entered credentials in real time — while displaying a convincing copy of the legitimate site. Some links trigger silent malware downloads without requiring any further interaction from the victim.

The attacker uses the harvested data to access accounts, exfiltrate sensitive files, deploy ransomware, commit financial fraud, or sell credentials on dark web markets. In Business Email Compromise (BEC) attacks, the attacker may impersonate a senior executive and instruct finance staff to transfer large sums of money to attacker-controlled accounts.

MFA is the single most impactful technical control against phishing. Even if an attacker successfully steals a password, MFA prevents them from using it without the second factor. Use authenticator apps (TOTP) or hardware security keys (FIDO2/WebAuthn) wherever possible — SMS-based MFA is better than nothing but is itself vulnerable to SIM-swapping and real-time phishing proxy attacks.

Enterprise email security solutions use machine learning to analyse sender reputation, email headers, URL reputation, and attachment behaviour to quarantine phishing messages before they reach employee inboxes. Solutions like Microsoft Defender for Office 365, Proofpoint, and Mimecast significantly reduce phishing exposure at the delivery stage.

These three email authentication standards prevent attackers from spoofing your organisation's domain. SPF specifies which mail servers are authorised to send email on your behalf. DKIM adds a cryptographic signature to outgoing messages. DMARC instructs receiving servers how to handle messages that fail SPF or DKIM checks — and provides you with daily reports on spoofing attempts. Set your DMARC policy to p=reject for the strongest protection.

The most effective way to build phishing resilience in your workforce is to test it. Simulated phishing campaigns send realistic fake phishing emails to employees; those who click receive immediate, non-punitive education tailored to the specific attack type they fell for. Platforms like KnowBe4, Cofense, and Proofpoint Security Awareness Training make ongoing simulation programmes straightforward to run. Update simulations regularly to reflect current attack techniques — including AI-generated content.

Many phishing attacks deliver malware that exploits known vulnerabilities in outdated browsers, document readers, operating systems, or server software. A rigorous patch management programme — keeping all software current and applying critical security updates promptly — closes these entry points before attackers can use them.

DNS filtering blocks requests to known malicious or suspicious domains at the network level, before a browser connection is established. If an employee clicks a phishing link, DNS filtering can prevent the browser from reaching the credential-harvesting page entirely — providing a safety net when human vigilance fails.

Phishing is frequently the first step in a multi-stage attack — stolen credentials are then used to access servers, databases, and internal systems. Ensuring your infrastructure is properly hardened means that even a successful phishing attack has a limited blast radius. Professional server hardening services reduce your attack surface by enforcing least-privilege access, disabling unnecessary services, applying security baselines, and monitoring for signs of post-compromise activity.

Employees who suspect they've received a phishing email — or clicked one — need a simple, blame-free process for reporting it immediately. Fast reporting allows your security team to pull malicious emails from other inboxes, alert affected users, and begin containment before an incident escalates. Make reporting as frictionless as possible, such as a one-click "Report Phishing" button in your email client.

Limit each user account's access to only the systems and data required for their role. If a phishing attack compromises a standard user account, least-privilege access limits what the attacker can reach — preventing lateral movement to sensitive databases, administrator consoles, or financial systems.

If you receive an unexpected request to transfer funds, share credentials, approve a purchase, or grant system access — even if it appears to come from a senior colleague or a trusted external partner — always verify through a completely separate communication channel: a direct phone call, an in-person conversation, or a message to a verified number you already have on file. Never use contact details provided in the suspicious message itself. This single rule stops the vast majority of BEC and whaling attacks.

If you clicked a link or opened an attachment that may have installed malware, immediately disconnect the affected device from all networks — Wi-Fi and wired. This prevents malware from communicating with attacker-controlled servers, exfiltrating data, or spreading to other devices on your network.

From a separate, clean device, immediately change the password for any account you entered credentials into. Also change your email account password, since attackers commonly use a compromised inbox to trigger password resets on linked services and to send further phishing emails from your address to your contacts.

After changing passwords, immediately enable multi-factor authentication on every affected account if not already active. This prevents the attacker from continuing to use stolen credentials even if they captured them before you changed them.

Notify your IT or security team immediately, even if you're embarrassed. They need to assess the scope, check other users for the same phishing email, scan the affected device for malware, and review logs for any signs of data exfiltration or account access. Speed of reporting is a critical factor in limiting damage.

Forward phishing emails to [email protected] (the Anti-Phishing Working Group) and to the organisation whose brand was spoofed. In the UK, report to the NCSC at [email protected]. In the US, file a report with the FTC at reportfraud.ftc.gov. If financial details were exposed, contact your bank immediately to freeze cards or accounts as appropriate.

Run a comprehensive malware scan on any device that interacted with the phishing content. If the scan detects an infection, isolate the device from the network and engage professional support for complete remediation before reconnecting it.