Sent small amount of ETH to new address, it was swept. How can I prevent this in the future? : ethereum

I generated a new address the same way I’ve been doing it for years. I sent a super small amount of ETH to it to load it up for gas to be used for later. It was swept within a few minutes. That’s never happened to me before. It was not my action that swept it either. I can see the address where the ETH was sent and this person has been sweeping small amounts of ETH to this address for some time now.

Clearly someone else with a bot and they somehow had this private key. Has this happened to anyone else? Scary thing is, I generated the private key the same way I’ve been doing it for a long time.

I’ve been reading about “weak private keys” and “ether combing”. Is there a way to detect/prevent this?

https://www.ise.io/casestudies/ethercombing/

https://www.wired.com/story/blockchain-bandit-ethereum-weak-private-keys/

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