This is the source code of the script that I used in October 2019 to congest EOS mainnet. EOS was ranked top7 by coinmarketcap at that moment. My attack caused EOS mainnet to freeze for almost a month.
Here is an article that describes the attack: https://www.eosgo.io/blog/Eos-network-congestion-by-ddos-analysis/
Here is my announcement of the attack: https://twitter.com/dexaran/status/1179071416764960768?lang=bg
Here is another article on subject by a EOS DAPP developer: https://steemit.com/gaming/@nickcav/move-your-txt-tokens-from-eos-to-trustdice-account
Here is an article from Cointelegraph: https://cointelegraph.com/news/research-claims-eos-network-can-freeze-blockone-denies-any-errors