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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallOn February 21, 2025, an attacker stole crypto from one of Bybit’s Ethereum cold wallets by compromising the transaction-approval workflow around its Safe multisignature wallet. Bybit’s preliminary account says Safe developer credentials were compromised; technical analysis by NCC Group explains how malicious code in the signing interface could make signers approve a transaction different from the one they thought they were reviewing. The attack did not establish that multisignature cryptography itself was broken. Bybit valued the stolen assets at about US$1.46 billion in its incident timeline.
What was stolen from Bybit?
Bybit’s incident timeline itemized the assets taken from one Ethereum cold wallet as follows. The quantities and approximate US-dollar valuation below are Bybit’s reported figures; the valuation is the company’s estimate in its 2025 timeline, not a fixed value for those tokens at every later date.
| Asset | Amount Bybit reported stolen |
|---|---|
| ETH | 401,347 |
| stETH | 90,375 |
| cmETH | 15,000 |
| mETH | 8,000 |
Bybit put the combined value at about US$1.46 billion. The headline figure is therefore a dated valuation of the reported token amounts, rather than a claim that the same quantity would have the same market value later.
How was the Bybit hack done?
A routine transfer became the approval opportunity
Bybit described the event as a routine transfer from an Ethereum multisignature cold wallet to a warm wallet. In its February 26, 2025 preliminary forensic update, the exchange said Safe developer credentials had been compromised, giving the attacker access to Safe Wallet infrastructure. Bybit’s incident timeline says the Safe multisig interface was spoofed in a phishing-style attack.
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The approval screen did not reliably show what was being signed
NCC Group’s March 10, 2025 technical analysis describes malicious JavaScript manipulating the transaction data presented during approval. In practical terms, signers could see what appeared to be an ordinary transfer while their signatures authorized a change to the wallet’s smart-contract logic. That change gave the attacker control of the wallet’s contract implementation, after which the assets could be moved.
The crucial weakness was the gap between the transaction a signer believed they were approving and the transaction their signature actually authorized. Multiple signatures do not provide much protection if each signer is misled by the same compromised approval path.
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What the incident does—and does not—show about cold storage
Cold storage describes how signing keys are kept; it does not guarantee that the transaction presented to a signer is trustworthy. Likewise, this incident is not evidence that Safe’s multisignature cryptography was cracked. The accounts available describe a compromised interface and signing workflow, not a mathematical break of the multisignature scheme.
Bybit said its preliminary investigation found no indications that its own infrastructure had been compromised. That is the company’s account of its investigation, not an independently established finding about every system involved. The reporting also does not show that an ordinary consumer hardware wallet would have prevented the attack: the described failure was in the interface and transaction approval path, and no cited source tested a consumer device against it.
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Who did the FBI say stole the funds?
On February 26, 2025, the FBI attributed the theft to the Democratic People’s Republic of Korea (DPRK) and referred to the actors as TraderTraitor. Bybit’s own February 26 preliminary forensic update named Lazarus Group. These are attributed statements by the FBI and Bybit, respectively; they should not be collapsed into a claim that every detail of the attackers’ identities or operations has been independently established here.
The FBI said TraderTraitor actors were converting some stolen assets into Bitcoin and other virtual assets and dispersing them across thousands of addresses on multiple blockchains. That description indicates a broad laundering effort, but attribution and movement across addresses do not establish where every asset is now or whether it can be recovered.
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Were Bybit customer funds safe after the theft?
Bybit’s reported response in 2025
Bybit’s March 3, 2025 incident chronology said withdrawals continued after the theft and that the exchange covered the ETH deficit through bridge loans, deposits from large holders, and over-the-counter purchases. The chronology also described a February 24 proof-of-reserves report by Hacken and Bybit’s claim that key assets had collateral ratios above 100% at that time.
Those statements describe Bybit’s response and reported reserve position in 2025. They do not by themselves establish the exchange’s current financial position, prove that every customer’s assets were continuously available, or substitute for an independent assessment of its present-day liabilities and reserves.
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Recovery and litigation reported in August 2026
In a release dated August 7, 2026, Bybit said it had filed a civil lawsuit in the U.S. District Court for the District of Columbia against the DPRK, its Reconnaissance General Bureau, Lazarus Group, and John Doe defendants. Bybit said the court granted a preliminary injunction freezing identified assets during the litigation. The company quoted the court as finding that “Bybit has demonstrated a likelihood of success on the merits”; that quotation and description of the ruling are reported by Bybit, rather than cited here directly to the court record.
In the same release, Bybit reported approximately US$48.4 million recovered and more than approximately US$30.5 million frozen across more than 28 exchanges and custodians. It said the frozen assets remained subject to legal and investigative action and that proceedings were ongoing. These are Bybit’s figures and status as of August 7, 2026, not independently verified totals or a final judgment; recovery amounts can change as investigations and litigation continue.
What would make a signing workflow safer?
The incident points to safeguards around transaction review and approval, not simply to adding another device or another signer. A custody system’s practical resilience depends on whether it can detect a mismatch between what the interface displays and what is actually signed.
Quick Recap
- Independently verify transaction data: Compare the destination, operation, and contract changes shown for approval with the transaction that the signing process will authorize. A screen controlled by the same compromised interface is not an independent check.
- Limit what approvals can do: Restrict arbitrary contract operations where the system allows it, so a routine transfer cannot silently authorize a change to wallet logic.
- Protect developer and interface access: Compromised developer credentials and web-interface code can affect what signers see, so access controls and review of changes to signing infrastructure matter alongside protection of private keys.
- Plan for assets that move on-chain: Once funds are dispersed across chains and addresses, recovery may depend on tracing, cooperation from exchanges or custodians, freezes, and legal action. A freeze is not the same as a completed recovery.
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