There is a deployed contract which is not verified.
How 1 eth got withdrawed from the contract without any permission??

Why do you need to verify to withdraw?

so how you can call withdraw without knowing abi or verified code?

First 0x00000000 method id get done(which i don’t know what is exactly) and after that, withdraw of WETH happended

Who deployed the contract?

One of my friends

Then it had access control error and someone decompiled and withdrew those ethers

All the write functions in the contract, has onlyOwner modifier. How is that possible??

And also, what is method id: 0x00000000 ??

Share the source

I don’t have it. it’s private source.
But i know it has some assembly level source in it
Also works with weth

we can't help without the source

He just invoked the fallback function(0x000.. its function signature. Which doesn't exist in the contracts functions .. so the fallback will be triggered).. and executed what ever the code in it which allows him to withdraw

without checking the original code it's quite hard to understand