20 Minutes, $6.3 Billion Gone: The Binance Hack Explained

If you follow closely the recent hack on Binance hack on 28 Oct 2026, we can learn something from this. This blog is my own understanding of the hack, verified against reliable source- see bottom page reference section. The entire story may not be complete as investigation is still on-going.

First, in one statement what happen? Binance says it likely started with one engineer's work laptop. The hacker used it to reach Binance's internal systems, and then got Binance's own wallet system to approve withdrawals to the hacker. About $6.3 billion left in roughly 20 minutes.

What Binance itself has said (official statements)

1. Where it started: "a compromised DevOps engineer's laptop." A DevOps engineer is a staff member who looks after Binance's computer systems.
2. What the hacker reached: that laptop gave the attacker access to a "service container", a piece of Binance's internal software that handles tasks such as withdrawals.
3. What the hacker did: they submitted unauthorized withdrawal transactions, meaning they told Binance's system to send money out.
4. Private keys were not stolen: Binance says it found "no evidence of any wallet private key leak." (Private keys are the master passwords to crypto wallets.)
5. It was more than one laptop: co-CEO Richard Teng later said "the attacker did not simply use one engineer's permissions, and this was not a single 'one-click' action". Binance said it found "additional points of breach."
6. No individual blamed: "Our investigation has not attributed responsibility to any individual."
7. Users will be covered from Binance's emergency SAFU fund and its own money.

How the money was taken (blockchain experts' reconstruction)

This comes from TRM Labs and Elliptic, firms that study blockchain records. It's their analysis, not Binance's confirmed explanation.

In simple steps:

1. Preparation (at least 36 hours before): the hacker set up their own wallet using small amounts from Tornado Cash, a service that hides where crypto came from. A few hours before, they tested their code on 3 wallets.
2. Getting Binance to "sign" for them: the hacker got Binance's hot wallet, the online wallet used for everyday withdrawals, to sign 50 permission slips in advance. Each slip said: "let the hacker's program control this wallet."

• Why 50? Every wallet keeps a counter of its transactions, and each permission works only at one exact counter number. Binance's wallet was busy with normal withdrawals, so the number kept changing. By preparing 50 in a row, the hacker made sure one would still match. It is a bet and one actually did.

1. The theft (20:20 UTC): about 3.5 minutes later, the hacker told the wallet to send its entire balance to their address. That one transaction moved 167,464 ETH plus 63 tokens, including about 1.6 billion USDT.
2. The same thing happened across about 10 blockchains within roughly 20 minutes.

Questions left unanswer:

1. How was the engineer's laptop hacked? — Not disclosed by Binance
2. Was it a fake job offer or coding test (a known North Korean trick)?- Only a possibility Elliptic raised from past hacks. This is not confirmed yet.
3. What are the "additional points of breach"? — Not disclosed
4. How did Binance found out about the hack? Binance's own security team spotted the unauthorized withdrawals while they were happening, at about the same time as outside blockchain-monitoring firms raised alarms. Exact details not published yet.
5. Full root cause — Binance hasn't published it yet. It's working on a full post-mortem
6. Did any keys leak? According to Binance, no but Blockaid Says Eleven Binance Keys Signed the Transfers.
7. Who is behind this? — Quote directly fro TRM "The Binance hack is link to TraderTraitor, a North Korean state-sponsored hacking group, based on robust onchain and offchain intelligence. The same group was behind the USD 1.5 billion Bybit hack in February 2025"

So, what can we learn? The Binance hack shows that even the world's largest crypto exchange can be breached, not by cracking its encryption but by getting past the people and computers around it. What reportedly began with one engineer's compromised laptop became a $6.3 billion theft, because the attacker could get Binance's own systems to approve withdrawals on their behalf. The first lesson is that security is only as strong as its weakest human link: one infected device or one successful scam can open the door to everything. The second is that automated systems need hard limits, such as caps on how much a hot wallet can send at once and extra checks on unusual instructions, so a single breach can't drain billions in minutes. The third is that speed and cooperation matter: about $3 billion was frozen quickly because stablecoin issuers, blockchain analysts and exchanges acted together. Binance has promised to cover user losses, but the full story of how the attack unfolded won't be known until its final investigation is published.

Reference:

1. https://www.trmlabs.com/resources/blog/north-korea-steals-usd-6-36-billion-from-binance-in-the-largest-hack-in-history
2. https://decrypt.co/382203/binance-finds-additional-points-of-breach-in-6-3b-hack
3. https://www.forbes.com/sites/digital-assets/2026/10/30/binances-63-billion-hack-started-with-one-engineers-laptop/
4. https://thehackernews.com/2026/10/binance-suffers-security-breach.html
5. https://financefeeds.com/binance-hack-eleven-keys-signed-no-leak/?
6. https://news.sbs.co.kr/english/article.do?news_id=N1008824704