834 hack event(s)
Description of the event: Messari, a cryptocurrency research organization, announced on the 27th that Stellar's blockchain protocol had an inflation loophole in April 2017. An attacker used the loophole to create 2.25 million XLM (worth about 10 million US dollars). This bug was discovered by the Stellar Development Foundation (SDF) and patched after the accident.
Amount of loss: 10,000,000 Attack method: Inflation
Description of the event: Bitfinex suffered a cyber attack in August 2016. 2,072 Bitcoin transactions were transferred out without Bitfinex's authorization, and then the funds were scattered and stored in 2,072 wallet addresses. Statistics show that Bitfinex lost a total of 119,754.8121 BTC. It was worth about $60 million at the time of the incident, or about $4.5 billion in today's prices. The U.S. Department of Justice (DOJ) announced on Tuesday (February 8, 2022) that it has seized $3.6 billion worth of bitcoin in connection with the 2016 hack of cryptocurrency exchange Bitfinex. Ilya Lichtenstein, 34, and his wife Heather Morgan, 31, were arrested in New York on charges of conspiracy to launder money and defraud.
Amount of loss: $ 900,000,000 Attack method: Unauthorized theft
Description of the event: The DAO smart contract running on the Ethereum suffered a reentrancy-attack-on-smart-contract.
Amount of loss: $ 60,000,000 Attack method: Reentrancy attack
Description of the event: Gatecoin experienced a cyberattack on its hot wallets that resulted in the loss of funds. A new update from the exchange team indicated that as much as $2m was lost, confirming rumors that circulated soon after the hack became apparent. Gatecoin has claimed that it lost as much as 185,000 ethers and 250 bitcoins, an amount worth roughly $2.14m at press time.
Amount of loss: 2,000,000 USD Attack method: Server is hacked
Description of the event: KipCoin announced that the attacker gained access to the server in 2014 and downloaded the wallet.dat file. A few months later, the attacker stole more than 3,000 BTC.
Amount of loss: 3,000 BTC Attack method: Server is hacked
Description of the event: BTER announced that it lost 7,170 BTC (then worth $1.75 million). The company claims that BTC was stolen from a cold wallet.
Amount of loss: 1,750,000 USD Attack method: Cold wallet stolen
Description of the event: Bitstamp reported that multiple operating wallets were damaged, resulting in the loss of 19,000 bitcoins. The company was hacked by multiple phishing attacks in the months before the attack. An employee downloaded a malicious file that allowed an attacker to access the password of the company's hot wallet and the server including the wallet.dat file.
Amount of loss: 19,000 BTC Attack method: Phishing attack
Description of the event: MintPal announce that the attacker stole 8 million VeriCoins ($1.8 million) from the company's hot wallet. The attacker exploited a vulnerability in its system that allowed them to bypass the security controls to withdraw funds.
Amount of loss: 1,800,000 USD Attack method: Stolen hot wallet
Description of the event: Digital currency exchange Poloniex, which trades bitcoin and other popular digital currencies such as litecoin, namecoin and dogecoin, has lost 12.3% of its total bitcoin supply in an attack. The exchange took to Bitcoin Forum on 4th March to report it had been compromised by a previously unknown vulnerability in its coding.
Amount of loss: 97 BTC Attack method: Unknown
Description of the event: MtGox was hacked. Losses totalled 850,000 BTC, worth $470m at the time.
Amount of loss: 850,000 BTC Attack method: Stolen hot wallet
Description of the event: On June 8, Feathercoin was attacked by 51%. Before the attack, Feathercoin's total computing power was 0.2GH/s, and during the time of the attack, the computing power doubled 7 times to 1.5GH/s. Thirty-one hours later, an investigation revealed that the attacker took away 580,000 Feathercoin through a double-spending attack on the exchange, at a current price of $63,800.
Amount of loss: $ 63,800 Attack method: 51% attack
Description of the event: Bitcoin exchange Bitfloor suspended operations after the theft of $250,000. The founder Roman Shtylman explained in a post on the Bitcoin Forum that an attacker obtained an unencrypted backup of exchange wallet keys and used these keys to transfer "BitFloor on hand" Most of the coins he held," Shtilman later locked this part of the money at around 24,000 BTC.
Amount of loss: 24,000 BTC Attack method: Private key leak
Description of the event: Bitcoinica was hacked twice in 2012. Hackers stole a total of 61,000 BTC, leading to the bankruptcy of Bitcoinica.
Amount of loss: 61,000 BTC Attack method: Stolen hot wallet
Description of the event: The attacker has a lot of computing power to launch a 51% attack. The interesting thing about the Coiledcoin attack is that it is not economically driven, but purely political. Although this move has caused some protests in the community, it shows how vulnerable the SHA-256 cryptocurrency with low hashing power is to attack.
Amount of loss: - Attack method: 51% attack