What Is Phishing and How Does It Work
Phishing is a cyberattack in which someone impersonates a trusted person or institution — your bank, a tax authority, a vendor, even your own boss — to trick you into handing over passwords, card details, or access to company systems. The attack almost always arrives by email, text message, or chat app, carrying a link or attachment that leads to a fake page or installs malicious software.
What makes phishing effective isn't the technology behind it, it's the manipulation: the message creates urgency ("your account will be suspended"), fear ("we detected an unrecognized charge"), or misplaced trust ("this is the director, I need this wire done today"). That's why no business is exempt, regardless of size or industry.
Common Types of Phishing
Not every phishing attack looks the same. Knowing the variants helps your team recognize the threat no matter which channel it arrives through:
- Bulk email phishing. The most common form: generic emails sent to thousands of addresses at once, imitating banks, delivery services, or popular platforms.
- Spear phishing. Attacks targeted at a specific person, using their name, role, or real projects to appear legitimate. It requires the attacker to research the victim first.
- Whaling. A spear phishing variant aimed at executives or business owners, because they hold more approval power (wire transfers, access, contracts).
- Business Email Compromise (BEC). The attacker impersonates or compromises a real executive's or vendor's account to request a transfer or a change in banking details, almost always framed with urgency.
- Smishing. The same technique over SMS, with short links that lead to fake bank pages, delivery notices, or pending-payment pages.
- Vishing. Phishing over a phone call, where the attacker poses as tech support, a bank, or an authority to obtain data by voice.
- Pharming. Instead of tricking the user with a message, it redirects traffic from a legitimate site to a fake copy, without the victim clicking anything suspicious at all.
Warning Signs of a Phishing Email
Most phishing attacks share patterns that can be spotted before you ever click:
- A sender address that almost matches the real one, with a domain that's off by a letter or uses a different extension.
- Artificial urgency: "act within 24 hours" or "your account will be locked today."
- Links that don't match the visible text; hovering over the link shows a real destination different from what's displayed.
- Requests that skip the normal process, like asking for a wire transfer by email when company policy requires approval through the system or a separate channel.
- Unexpected attachments, especially with executable extensions or macros the message insists you enable.
- Writing or formatting errors that don't match the usual style of the brand or person supposedly sending it.
- Requests for data a real company never asks for by email, like full passwords or verification codes.
No single sign confirms an attack on its own, but two or more together are reason enough to verify before acting.
Phishing Examples You Should Know
Concrete examples help a team recognize the pattern the next time it shows up:
- An email that appears to come from a tax authority, claiming a "pending refund" and asking you to click a link to "confirm your account."
- A message impersonating a regular vendor, announcing they "changed bank accounts" right before a scheduled payment date.
- A text message that looks like a delivery notice, with a link to "reschedule delivery" that actually asks for card details.
- An email that appears to come from the CEO, sent from an almost-identical domain, asking finance for an urgent, confidential wire transfer.
- A phone call from a supposed IT support team, asking for a password to "fix an issue" that doesn't actually exist.
In every one of these cases, the mechanism is the same: build trust or urgency so the victim acts before thinking twice.
How to Prevent Phishing in Companies: Key Controls
Reducing phishing risk in a business combines technology, process, and people. No single control is enough on its own:
- Multi-factor authentication (MFA) on email, VPN, and critical systems. Even if an attacker gets the password, they can't get in without the second factor.
- Ongoing training with real examples and phishing simulations, not just a one-time session during onboarding. Recognition of these signs fades if it isn't reinforced.
- Dual-verification processes for wire transfers and changes to banking details, especially when the request arrives by email framed as urgent.
- Email filtering and domain-reputation tools that catch spoofed senders before the message ever reaches an inbox.
- A least-privilege policy, so that one compromised account doesn't hand over access to every system in the company.
- A clear channel to report suspicious messages, without anyone worrying about "bothering" IT over a false alarm.
These controls work best as part of a broader enterprise security strategy, where phishing prevention is paired with threat detection at the network and access level.
What to Do If an Employee Clicks a Phishing Link
If someone on your team already clicked or handed over data, the order of actions matters more than the speed of any single one:
- Change the affected password immediately, from a device you know isn't compromised, and update it on any other account where it was reused.
- Turn on MFA for that account if it wasn't already enabled, and check whether there's already an active session you don't recognize.
- Report the incident to IT or your security lead, even if it seems minor: the faster it's known, the less damage it can do.
- Review recent account activity: sent emails you don't recognize, auto-forwarding rules added without permission, logins from unusual locations.
- Warn anyone who might be affected, especially if the attack was disguised as an internal contact, so they don't fall for the same message.
- Document what happened: what the message said, what was clicked, what data was shared. That record helps improve filters and future training.
Following this order doesn't eliminate the risk, but it shortens the window an attacker has before someone notices and shuts it down.
Frequently Asked Questions
What is phishing and why is it dangerous for businesses
It's a social engineering attack in which someone impersonates a trusted source to steal credentials, financial data, or access to systems. It's dangerous because it doesn't depend on a technical flaw, it depends on a person trusting and acting without verifying, which makes it hard to block with technology alone.
What's the difference between phishing and spear phishing
Bulk phishing is sent without personalization to thousands of recipients, while spear phishing targets one specific person, using real details about their role, projects, or contacts to make it look more credible.
Is antivirus software enough to prevent phishing in a company
No. Antivirus software helps against malicious files, but most phishing attacks aim to get a person to enter data directly on a fake page, something no antivirus can stop without training and controls like MFA.
How do I know if an email from my bank or a government agency is phishing
Check the sender's exact domain, don't click links inside the email, and go directly to the official site by typing the address yourself. No legitimate institution asks for full passwords or verification codes by email or text.
How often should a team be trained against phishing
Ideally several times a year, combined with internal phishing simulations, because recognition of these warning signs fades over time if it isn't practiced.
If your business wants to reduce phishing risk without relying only on every person catching the message in time, at AISDC we design enterprise security strategies that combine technical controls, MFA, and training built around how your team actually works. Learn more about cybersecurity, two-factor authentication, and social engineering as pieces of the same problem.