Phishing Attacks in Crypto: How to Avoid Them

Between late 2022 and late 2023, a single operation called Inferno Drainer stole roughly $87 million from more than 137,000 victims, spread across over 16,000 phishing domains impersonating at least 100 real crypto brands. The scale of the drainer economy has only grown since: Chainalysis has tracked billions of dollars stolen through this method, concentrated not just among careless newcomers but across the full range of crypto users, including experienced holders who signed one bad transaction in a rushed moment. None of those victims typed a password into a fake login page. They signed a transaction. That distinction is exactly what makes modern crypto phishing more dangerous than the version most people picture. Crypto phishing attacks have only grown more sophisticated since.

Classic Phishing: The Version Everyone Already Knows

Fake login pages, urgent “verify your account” emails, and lookalike domains designed to steal a password or seed phrase. This version is still common, and the defense is straightforward: never enter credentials or a recovery phrase anywhere you navigated to via a link rather than typing the address yourself. How to Avoid Crypto Scams: Red Flags to Watch For covers the broader pattern this fits into, urgency and manufactured pressure being the common thread across nearly every version.

Approval Phishing: The More Dangerous Evolution

Rather than stealing your login, a wallet drainer tricks you into signing a transaction that grants a malicious contract ongoing permission to move your tokens, often triggered by a fake airdrop, mint, or “claim your tokens” page. Your private key never leaves your device. You hand over authority instead, through a signature you approved yourself, which is exactly why so few people see it coming. In January 2024, attackers even compromised the SEC’s own official social media account to promote a fake token airdrop that was, in fact, a wallet drainer, a reminder that even a verified, official-looking account isn’t proof of legitimacy on its own. The moment that approval lands, the attacker’s contract can sweep the authorized assets, sometimes within seconds.

This has become an organized industry. “Drainer-as-a-service” operations rent out ready-made phishing kits and draining contracts to affiliates, who keep the majority of what they steal. The technical skill required to run a sophisticated attack has dropped close to zero.

What “Blind Signing” Means and Why It’s Dangerous

Many wallets can’t render complex transaction data in plain, readable language, showing an opaque string of code instead of a clear description of what you’re actually authorizing. This isn’t a flaw unique to any one wallet brand, it reflects a genuine, unresolved technical challenge: translating complex smart contract interactions into language a non-technical person can actually evaluate before approving. When you can’t read what you’re signing, you’re trusting the website’s description of it, which is exactly the gap drainers are built to exploit. Treat any signing request you don’t fully understand as a reason to stop, not a formality to click through.

How to Protect Yourself From Crypto Phishing Attacks

Verify URLs independently rather than clicking through from social media, Discord, or an email, typosquatted domains are a core part of how these attacks spread. Never sign from a manufactured sense of urgency, a limited-time airdrop is a classic lure specifically designed to rush a decision you’d otherwise slow down for. And be especially cautious connecting your wallet to any new site, since connecting itself is often the first step toward a later approval request. How to Secure Your Crypto Wallet From Hackers covers additional device-level habits that complement these specifically phishing-focused defenses.

Checking and Revoking Old Approvals

Every approval you’ve ever granted remains active until you explicitly revoke it, including ones from months or years ago that you’ve long forgotten about. Free, publicly available token approval checkers let you review and revoke these permissions for any wallet address. Set a recurring reminder to do this every few months, similar to reviewing which apps have access to an email or social media account, since the habit only works if it’s actually repeated rather than done once and forgotten. This is worth doing periodically, not just after a suspected incident, since an old, forgotten approval to a since-compromised contract is a real, standing risk sitting quietly in your wallet.

Common Phishing Lures to Recognize

Fake customer support responding to a public complaint you posted, a compromised official social media account promoting a suspicious “airdrop,” and search ads for exchanges that lead to a convincing but fake copy of the real site are all common delivery methods. Even a compromised official account, including ones belonging to major, well-known organizations, has been used to promote drainer links, which means brand recognition alone is never sufficient verification. What to Do If You’ve Been Scammed in Crypto covers the immediate steps worth taking if a drainer has already succeeded against you.

Frequently Asked Questions

Phishing in crypto has evolved well past fake login pages. The most damaging version today doesn’t need your password at all, it needs your signature, given in a moment you didn’t slow down enough to actually read. That single habit, reading before you sign, is worth more than almost any other security practice covered on this site. Most crypto phishing attacks still fail against one habit: slowing down and reading exactly what you are asked to sign.

Prefer to learn from a book, at your own pace? The Crypto Book Series covers this in more depth. If you’re new to crypto, start with Book 1, then work through the series as you go.

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