ABCCApp USDT Overclaim addFixedDay Access Control Missing

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Binance Security Image

The ABCCApp smart contract on Binance Smart Chain allowed users to claim daily stablecoin rewards but contained a critical vulnerability due to a missing access control on the addFixedDay function. This function was essential in calculating claimable BSCUSD (though TenArmor reports the loss in USDT). The flaw allowed an attacker to manipulate the rewards, leading to an estimated $10.1k loss. The project lacks any public-facing presence, and there is no evidence of recovery efforts, further investigation, or community awareness beyond TenArmor’s report.[1][2][3][4][5]

About ABCCApp

The ABCCApp smart contract on the Binance Smart Chain appears to provide the ability to claim daily stablecoin rewards. The smart contract was launched on April 1st, 2023.

The Reality

Unfortunately, the smart contract was launched with a missing access control on a key addFixedDay function, which was instrumental in calculating the claimable amount of the BSCUSD stablecoin.

What Happened

The ABCCApp smart contract on Binance Smart Chain suffered a $10.1k exploit due to missing access control on a key function.

Key Event Timeline - ABCCApp USDT Overclaim addFixedDay Access Control Missing
Date Event Description
April 1st, 2023 6:31:12 AM MDT ABCCApp Smart Contract Launch The exploited ABCCApp smart contract is originally launched on the Binance Smart Chain.
August 23rd, 2025 8:32:07 AM MDT Attack Transaction Occurred The attack transaction is accepted into the Binance Smart Chain.
August 23rd, 2025 9:26:00 PM MDT TenArmor Posts About Exploit TenArmor makes a tweet about the exploit on their Twitter/X account. They provide some high level information on the nature of the exploit.

Technical Details

The technical description provided by TenArmor is as follows:

"The root cause is that the addFixedDay() function lacks access control, and fixedDay is used in the calculation of claimable USDT."

Total Amount Lost

TenArmor reported the loss with an estimated value of $10.1k. While TenArmor reports that the amount is claimable in USDT, it appears that the attack transaction took BSCUSD.

The total amount lost has been estimated at $10,000 USD.

Immediate Reactions

The project does not appear to have a public website or social media presence. The transaction was reported by TenArmor.

Ultimate Outcome

It's unclear if there is any outcome. There do not appear to be any mentions of this transaction in any other locations.

Total Amount Recovered

There is no suggestion that any funds have been recovered.

There do not appear to have been any funds recovered in this case.

Ongoing Developments

There does not appear to be any ongoing attempt to investigate further or recover funds.

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

  1. ↑ TenArmor - "Our system has detected a suspicious attack involving #ABCCApp on #BSC, resulting in an approximately loss of $10.1K. The root cause is that the addFixedDay() function lacks access control, and fixedDay is used in the calculation of claimable USDT." - Twitter/X (Accessed Aug 27, 2025)
  2. ↑ Attack Transaction - BSCScan (Accessed Aug 27, 2025)
  3. ↑ ABCCScan Exploiter Address - BSCScan (Accessed Aug 27, 2025)
  4. ↑ The Exploited Smart Contract - BSCScan (Accessed Aug 27, 2025)
  5. ↑ The Exploited Contract Creation Transaction - BSCScan (Accessed Aug 27, 2025)
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