What Is Social Engineering? The Human Hack Behind Most Cyberattacks

Your firewall didn't fail. Your antivirus didn't miss a thing. The hacker didn't break in through a vulnerability in your software. Instead, they just asked. And someone answered.

That's social engineering, and it's the reason 60% of all data breaches in 2025 involved the human element, according to the Verizon 2025 Data Breach Investigations Report (DBIR). It's the oldest trick in the cybercriminal's book, and it's still the most effective one.

What is social engineering?

Social engineering is the art of manipulating people into revealing confidential information or performing actions that compromise security. Rather than exploiting a flaw in code, attackers exploit a flaw in human nature: our trust, helpfulness, fear, and curiosity.

As the NIST Cybersecurity Framework defines it, social engineering targets human fallibility, not software vulnerabilities. It's less about technical skill and more about psychology.

The goal is always the same: get a person on the inside to open the door. Sometimes that looks like a panicked email. Sometimes it's a convincing phone call. Sometimes it's a deepfake video of your CEO.

Why social engineering works: the psychology behind the hack

Attackers succeed because they study human behavior and exploit the cognitive shortcuts our brains take every day. The most common psychological triggers they use include:

1. Fear and urgency

"Your account has been suspended. Click here immediately."

Creating panic short-circuits critical thinking. When we're afraid, we act fast, and that's exactly what attackers exploit. Urgency is the oldest social engineering lever, and it still works.

2. Authority and trust

"This is your IT department. We need your login credentials to resolve a security incident."

Humans are conditioned to defer to authority. Attackers impersonate executives, IT staff, government agencies, and even law enforcement. An order from a figure of authority feels harder to question, even when it should be.

3. Curiosity and greed

"You've been selected to receive a $500 Amazon gift card. Click to claim."

Baiting attacks play on our natural curiosity and desire for reward. A USB drive left in a parking lot. A too-good-to-be-true email. These lures get people to act without thinking.

The awareness-action gap

Here's what makes this so difficult to solve: many employees know an action feels risky but do it anyway, for convenience, to avoid friction, or to seem helpful. This awareness-action gap means the problem isn't just about training. It's about security design. When security controls create too much friction, people find workarounds. When verification processes are unclear, people skip them.

The most common types of social engineering attacks

Phishing

Mass emails made to look legitimate (from your bank, a popular service, or your own company) that trick recipients into clicking malicious links, downloading malware, or entering credentials on fake websites.

Spear phishing and whaling

Unlike broad phishing, spear phishing is targeted. Attackers research a specific individual, often using LinkedIn, social media, or public records, and craft a message that feels personal and legitimate. Whaling targets executives, with attackers impersonating the CEO or CFO to authorize fraudulent wire transfers.

Pretexting

The attacker creates a fabricated scenario to manipulate a target. Think: "Hi, I'm from the IT audit team. I need to verify your credentials for a compliance check." Pretexting briefly overtook phishing as the top social engineering tactic in Verizon's 2023 DBIR, though the 2025 DBIR shows phishing back in the lead (57% vs. 30% of social engineering incidents).

Vishing (voice phishing)

Phone-based attacks where scammers impersonate trusted figures: tech support, IRS agents, bank fraud departments. Vishing surged 442% from the first half to the second half of 2024, according to CrowdStrike's 2025 Global Threat Report, fueled by AI voice-cloning tools that can replicate someone's voice from just seconds of audio.

Smishing (SMS phishing)

Text message-based attacks, often spoofed to appear from your bank, a delivery service, or a government agency. With more people managing sensitive accounts from their phones, smishing has become a high-yield attack method.

Business Email Compromise (BEC)

One of the most financially damaging forms of social engineering. Attackers impersonate an executive or vendor via email to trick employees into wiring money or handing over sensitive data. BEC caused $2.77 billion in losses in 2024 alone, per the FBI's Internet Crime Complaint Center (IC3). The median loss from a single BEC incident: $50,000.

Baiting

Attackers leave infected USB drives or other physical media in places where targets will find them, a company parking lot, a conference room, banking on curiosity. Once plugged in, the device installs malware automatically.

Tailgating and piggybacking

Low-tech but effective: an attacker gains physical access to a restricted area by following an authorized employee through a door, often playing the role of a vendor, delivery driver, or new hire.

Real-world social engineering attacks (and what they cost)

The MGM Resorts hack (2023): 10 minutes to own a $14B company

In September 2023, threat group Scattered Spider (linked to ALPHV/BlackCat) took down MGM Resorts International with a social engineering attack that reportedly took just 10 minutes to execute.

The method? A phone call to MGM's IT help desk. Attackers looked up an MGM employee on LinkedIn, gathered enough information to convincingly impersonate them, then called the help desk claiming to have lost their login credentials. The help desk reset the account and handed over access. The eventual damage: over $100 million in losses, with disrupted hotel check-ins, slot machines, and digital key cards across multiple resorts.

The Arup deepfake scam (2024): $25.6 million lost to a fake CFO

In early 2024, a finance employee at global engineering firm Arup was tricked into transferring $25.6 million to fraudsters after attending what appeared to be a video call with the company's CFO and other colleagues. Every single person on that call was a deepfake, AI-generated audio and video clones of real Arup executives.

This case marked a turning point: social engineering had evolved from email tricks to fully synthetic human impersonation at scale.

The Twitter/X hack (2020): 130 high-profile accounts

Hackers targeted Twitter employees with phone-based social engineering, convincing internal staff to hand over access to admin tools. The result: 130 accounts compromised, including those of Barack Obama, Elon Musk, Apple, and Jeff Bezos, all used to broadcast a Bitcoin scam that netted over $120,000 in hours. The attackers were teenagers.

The numbers: how big is the social engineering threat?

The data makes a clear case for why this deserves attention:

• 60% of all data breaches in 2025 involved the human element (Verizon DBIR 2025)
• $4.88 million, the global average cost of a data breach in 2024 (IBM Cost of a Data Breach Report 2024)
• $4.91 million, average cost of breaches that started with phishing, higher than any other initial attack vector (IBM X-Force 2025)
• $2.77 billion, losses from Business Email Compromise in 2024 alone (FBI IC3)
• Under 60 seconds, the median time for a user to fall for a phishing email (Verizon DBIR)
• 442% surge in vishing attacks, first half to second half of 2024 (CrowdStrike 2025 Global Threat Report)
• 36% of all intrusions between May 2024 and May 2025 were social engineering attacks, surpassing malware and exploits as the #1 breach method (TechRepublic / CrowdStrike)

AI is making social engineering more dangerous

The rise of generative AI has fundamentally changed the threat landscape. Attackers no longer need to write convincing phishing emails: AI does it for them, in any language, at any scale, with perfect grammar and contextual relevance.

More alarmingly:

• AI voice cloning can replicate someone's voice from just a few seconds of audio, enabling fake phone calls from "your CEO" or "your bank"
• Deepfake video technology (as seen in the Arup case) can fabricate entire video conferences with synthetic versions of real people
• AI-powered chatbots can engage in extended, convincing text conversations to extract information gradually
• Automated spear phishing can now personalize attacks at scale, combining scraped social media data with AI generation

The result is that attacks that previously required significant research and skill can now be launched by almost anyone with access to the right tools.

How to protect yourself (and your organization)

Social engineering is a human problem, which means defending against it requires a human-centered approach, not just technology.

Train, test, and retrain regularly. Security awareness training is essential, but it has to go beyond a once-a-year video. Regular phishing simulations, realistic scenario exercises, and ongoing micro-trainings help close the awareness-action gap. Employees need to practice skepticism, not just learn about it.

Implement Multi-Factor Authentication (MFA). MFA significantly raises the bar for attackers. Even if credentials are stolen, a second factor, an authenticator app, biometric, or hardware key, prevents account access. SMS-based MFA is weaker and can be bypassed; authenticator apps or hardware keys are more secure.

Establish out-of-band verification for financial requests. Any request to transfer money, change payment details, or share sensitive credentials should require a second, independent verification: a phone call to a known number, an in-person confirmation, or a secondary approval workflow. Never verify a financial request using contact information from the request itself.

Minimize your digital footprint. Attackers build profiles from LinkedIn, company websites, press releases, and social media. Encourage employees to limit the professional detail they share publicly, especially job titles, responsibilities, and internal tools or processes.

Apply the principle of least privilege. Not everyone needs access to everything. Limiting user permissions means that even if an attacker does compromise a single account, the blast radius is contained. Review and audit access rights regularly.

Create a culture where it's safe to ask. Many social engineering attacks succeed because the target was afraid to question authority or slow down a request. Build a culture where employees feel comfortable verifying unusual requests, even from the CEO, without fear of reprimand.

Use real-time threat detection. Modern security tools can flag anomalous email patterns, detect voice deepfakes, and identify behavioral deviations that suggest an account has been compromised. Guardio, for example, detects and blocks phishing sites and malicious links before you ever click them, working quietly in the background across your browser and your phone.

The bottom line

Social engineering doesn't need to break your systems: it just needs one person to answer, click, or say yes. Here's what actually reduces that risk:

• Multi-factor authentication makes a stolen password far less useful on its own
• A verification habit (calling back on a known number, confirming big requests through a second channel) stops most pretexting and BEC attempts cold
• Regular, realistic training closes the awareness-action gap between knowing a request feels off and acting on that instinct
• Real-time tools like Guardio catch phishing links and malicious sites before a rushed decision becomes a costly one

None of this requires perfect vigilance from every employee, all the time. It requires making the safe choice the easy choice.

Conclusion

Social engineering works because it targets something no software patch can fix: human nature. Our trust, our helpfulness, our fear, our curiosity, these aren't weaknesses to be ashamed of. They're what make us human. But in the hands of a skilled attacker, they're an open door.

The companies that get breached aren't always the ones with weak technology. Sometimes they're the ones with the strongest firewalls and the most sophisticated infrastructure, and a single employee who picked up the wrong phone call.

The good news: social engineering is also one of the most preventable threats in cybersecurity. Awareness, process, and the right tools can make your people your strongest layer of defense rather than your most vulnerable one.

Don't wait for the call. Start building that defense today. Get a free security scan with Guardio today and stay protected from social engineering threats.