Attackers search for these indexed files to download them and attempt to crack their encryption to steal the funds inside.
The wallet.dat file is a database (typically Berkeley DB or SQLite) that contains your private keys, public addresses, and transaction history. 📂 Quick Setup Guide To "install" or load your wallet.dat into Bitcoin Core: indexofwalletdat install
Copy a Bitcoin address (any public address). Then paste it into Notepad. If the pasted address differs from the one you copied, you are infected. Attackers search for these indexed files to download
This is a feature of misconfigured web servers. When a website does not have an index.html or index.php file, the server may display a directory listing—literally an "index of" all files and folders on that part of the server. Hackers use Google dorks (advanced search operators like intitle:index.of wallet.dat) to find these exposed directories. Then paste it into Notepad
On their own offline machine (critical—they never go online with an unknown wallet), they replace their existing wallet.dat in the Bitcoin data directory.