Safe Nintendo Honeypot

Reported loss Not disclosed
BNB Chain
Honeypot

What happened

Safe Nintendo (SFNINTENDO) is a BNB Chain token deployed on 14 April 2021 at 0xd5d0bcd6…8192f2. A comment at the top of the source advertises an NFT game, 3% reflections to holders and 3% auto-liquidity, but the contract contains no fee logic; instead, its internal _approve function only stores an allowance when the approving address is the hard-coded deployer 0xF576f0dD…acFd2D and stores zero for everyone else. A PancakeSwap sale needs the router to move the holder's tokens with transferFrom, which then fails the allowance check, so holders can buy but not sell through the router, while the deployer's own approvals work.

The owner can also mint any amount of SFNINTENDO to itself. De.Fi's REKT database lists Safe Nintendo as an exit scam/honeypot, stating that the contract owner could disable transfers and so stop holders from selling.

How it happened

  1. The constructor mints 1,000,000,000,000 SFNINTENDO (8 decimals) to the deployer.
  2. When a holder approves the PancakeSwap router, the approve call succeeds, but _approve checks if (owner == address(0xF576f0dDe6b6ecaBa4f25e4AC3241B8A17acFd2D)) and, for any other holder, runs _allowances[owner][spender] = 0; and emits Approval(owner, spender, 0).
  3. A router sale calls transferFrom, which subtracts the amount from the zero allowance with sub(amount, "BEP20: transfer amount exceeds allowance") and reverts.
  4. Buys use the pair's transfer to the buyer, which needs no allowance, so buying keeps working.
  5. The hard-coded deployer address keeps normal allowances, so it can still sell through the router. The onlyOwner function mint(uint256) can create unlimited SFNINTENDO for the owner. renounceOwnership would remove the mint power, but the allowance exception is tied to a fixed address, not to the owner role.

Protocol details

Classification Token
Protocol Type Exit Scam/Honeypot
Affected asset / contract SFNINTENDO

Evidence

Same attack technique

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