Reverse Engineering a Sniper Contract.

Hey, I've seen this contract on BSCScan. The owner of this contract made actually so much money so I've wondered how it works. Those are the notes I've took.

Owner: 0xa7cc7c1522f529320776d27d9340f534d3a73b7f Sniper: 0x851686b5db3c11e4bfc7fc9b92f66041bfae4665

0x432d5802

No transaction has made with this method.
Gets a address parameter does that unknownMap[addr(_param1)] = 1.
Looks not important.

0xf191414b

This function might be called to set the token buy amount.
The second parameter might be a bool to set swap path.

0xf6f33638

This should get the owner's balance (?)

call _owner with:
    value eth.balance(this.address) wei
    gas 2300 * is_zero(value) wei

0xc0af8385

The first parameter could be the target token that contract will snipe.
This contract has another path setting function that allows you to set the path length to 3.
This contract sets the path to for ex. WETH -> DAI.

addr(swapPath.WETH) = 0xbb4cdb9cbd36b01bd1cbaebf2de08d9173bc095c
...
addr(swapPath.targetTokenAddress) = _param1

0x744ebfb5

This function also sets the swap path but this time it you can add one more token to the path.
The path could be like: WETH -> DAI -> DOGE.

addr(swapPath3Lenght.WETH) = 0xbb4cdb9cbd36b01bd1cbaebf2de08d9173bc095c
...
addr(swapPath3Lenght.tokenAAddress) = _param1
...
addr(swapPath3Lenght.tokenBAddress) = _param2

0xfd0af329

This is the main function that does the swapExactETHForTokens with the value of eth.balance(this.address).
The path might change due to the which function being called. (0x744ebfb5, 0xc0af8385).

call router.swapExactETHForTokens with:
    value eth.balance(this.address) wei
    gas gas_remaining wei
    args 0, uint32(stor7.amountTokenToBuy?), 128, __owner, block.timestamp + 3600, swapPath.length

Summary

It looks like this contract doesn't have any special ability besides swapping. I'm pretty sure that there is another program that monitors the sniped token events and use that contract to snipe tokens.

Donations and Contact.

You can donate me in that wallet.

ETH/BSC: 0x9D3b16055aCcC713612a18aaBEFff9Db8163F9f5

I'm interested in job offers, you can contact me using those addresses.

Discord: cool guy#4125 Telegram: @HichigoR35

buzs / sniper-contract-notes