Bankroll Network Token Sale Contract Exploit
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Bankroll Network is similar to a decentralized bank, which operates through a smart contract. The project appears to have been inactive since February 2022. On September 22nd, 2024, a vulnerability in their token sale contract was exploited by a hacker. The project appears to be completely inactive, and therefore it is assumed that no assistance will be provided for any affected users.[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]
About Bankroll Network
"Bankroll is the best way to HODL and grow your crypto!"
"Bankroll is a premiere decentralized finance network on TRON. It implements a voluntary, sustainable, and permissionless global economic engine. Through a network of financial contracts the platform provides rewards in TRX, BNKRX, and BNKR. Bankroll... play to win!!!"
"Bankroll is a premiere decentralized finance network on the TRON blockchain. It implements a voluntary, sustainable, and permissionless economic global engine. Through a network of financial contracts the platform provides rewards in TRX, BNKR, BNKRX, and BTT. Bankroll… play and win!!! Bankroll simply put is a decentralized community bank. As a financial mutual organization; Bankroll holds a native store of value tied to TRON. These tokens are BNKR and BNKRX. BNKR is our digital cash and is more liquid than VLT on the Ethereum side of the network. BNKRX is our elastic reward token, which scales to the savings rate of the community. Both tokens are supported by several contracts which mine, exchange, and store value on the network."
The Reality
This sections is included if a case involved deception or information that was unknown at the time. Examples include:
- When the service was actually started (if different than the "official story").
- Who actually ran a service and their own personal history.
- How the service was structured behind the scenes. (For example, there was no "trading bot".)
- Details of what audits reported and how vulnerabilities were missed during auditing.
What Happened
"On September 22, Bankroll Network on BNB was attacked due to a contract vulnerability, resulting in a loss of approximately $230,000."
| Date | Event | Description |
|---|---|---|
| September 22nd, 2024 10:50:58 AM MDT | Blockchain Transaction | The blockchain transaction is present on the Binance Smart Chain. |
| September 22nd, 2024 10:53:00 PM MDT | Cyvers Alerts Tweet | The transaction is first noted by Cyvers Alerts. |
| September 23rd, 2024 1:11:00 AM MDT | First Shared News Report | The first news report is shared with some high level details of the exploit. |
Technical Details
"Victim contract is a token sale contract, there’re functions for buying and selling tokens. To buy tokens, users need to send WBNB to the pool, and some of that WBNB is used as fee(like reward to Liquid Providers).
This means “profitPerShare_” is increased when user buys tokens. Root cause of this hacking is in “buyFor” function. It’s a function for buying tokens on behalf of other user.
If “_customerAddress” is the same as address of victim contract, anyone can increase “profitPerShare_” without WBNB tokens.
Hacker bought some tokens before attack, and called “buyFor” function hundreds of times. “profitPerShare_” became much bigger than before, he could gain much more WBNB tokens by calling “withdraw” function.
He gained $230k."
Total Amount Lost
The total amount lost has been estimated at $230,000 USD.
How much was lost and how was it calculated? If there are conflicting reports, which are accurate and where does the discrepancy lie?
Immediate Reactions
"ALERT Our system has detected a suspicious transaction involving @Bankroll_Status on #BNB with loss of #230k It seems that #dualpools hacker is behind the suspicious transaction!. Our system has detected malicious contract deployment targeting #Bankroll 90 days ago!"
Ultimate Outcome
What was the end result? Was any investigation done? Were any individuals prosecuted? Was there a lawsuit? Was any tracing done?
Total Amount Recovered
There do not appear to have been any funds recovered in this case.
What funds were recovered? What funds were reimbursed for those affected users?
Ongoing Developments
What parts of this case are still remaining to be concluded?
Individual Prevention Policies
No specific policies for individual prevention have yet been identified in this case.
For the full list of how to protect your funds as an individual, check our Prevention Policies for Individuals guide.
Platform Prevention Policies
Policies for platforms to take to prevent this situation have not yet been selected in this case.
For the full list of how to protect your funds as a financial service, check our Prevention Policies for Platforms guide.
Regulatory Prevention Policies
No specific regulatory policies have yet been identified in this case.
For the full list of regulatory policies that can prevent loss, check our Prevention Policies for Regulators guide.
References
- ↑ BNB Smart Chain Transaction Hash (Txhash) Details | BscScan (Accessed Oct 25, 2024)
- ↑ @BSCNheadlines Twitter (Accessed Oct 25, 2024)
- ↑ @ThaiCryptoNews Twitter (Accessed Oct 25, 2024)
- ↑ @FXFinanceFeeds Twitter (Accessed Oct 25, 2024)
- ↑ @TechTinypen Twitter (Accessed Oct 25, 2024)
- ↑ @IntelChain_AM Twitter (Accessed Oct 25, 2024)
- ↑ @stakewatcher Twitter (Accessed Oct 25, 2024)
- ↑ @brokedoni Twitter (Accessed Oct 25, 2024)
- ↑ @coinlivespace Twitter (Accessed Oct 25, 2024)
- ↑ @Cat99Meow Twitter (Accessed Oct 25, 2024)
- ↑ @_Tazow Twitter (Accessed Oct 25, 2024)
- ↑ @BlckzillaCrypto Twitter (Accessed Oct 25, 2024)
- ↑ @CryptoTraderPro Twitter (Accessed Oct 25, 2024)
- ↑ @TheCryptoPost_x Twitter (Accessed Oct 25, 2024)
- ↑ @iNewsBTC Twitter (Accessed Oct 25, 2024)
- ↑ @alphaskout Twitter (Accessed Oct 25, 2024)
- ↑ @AltcoinWave Twitter (Accessed Oct 25, 2024)
- ↑ @alphaskout Twitter (Accessed Oct 25, 2024)
- ↑ @AltcoinWave Twitter (Accessed Oct 25, 2024)
- ↑ @zimisss Twitter (Accessed Oct 25, 2024)
- ↑ @JasonDotX Twitter (Accessed Oct 25, 2024)
- ↑ @Cryptovka Twitter (Accessed Oct 25, 2024)
- ↑ @veritas_web3 Twitter (Accessed Oct 25, 2024)
- ↑ @BSCNews Twitter (Accessed Oct 25, 2024)
- ↑ @BecauseBitcoin Twitter (Accessed Oct 25, 2024)
- ↑ @Stock_Market_Pr Twitter (Accessed Oct 25, 2024)
- ↑ @0xNickLFranklin Twitter (Accessed Oct 25, 2024)
- ↑ @NorqueNoq Twitter (Accessed Oct 25, 2024)
- ↑ @MarketsDotNews Twitter (Accessed Oct 25, 2024)
- ↑ @0xNickLFranklin Twitter (Accessed Oct 25, 2024)
- ↑ @CyversAlerts Twitter (Accessed Oct 25, 2024)
- ↑ @Bankroll_Status Twitter (Accessed Oct 25, 2024)
- ↑ Bankroll Network hacked – Defi hack analysis (Accessed Oct 25, 2024)