Once a file like "1.2k VALID HOTMAIL.txt" is generated, it is used for several malicious purposes:
These lists were often the result of data breaches on unrelated websites. Since people frequently reuse passwords, "hackers" would test these combinations against Hotmail to see which ones worked. 1.2k VALID HOTMAIL.txt
The Mystery of the ‘1.2k VALID HOTMAIL.txt’ File: What It Is, Why It Exists, and Why You Should Be Careful Once a file like "1
If you find active unauthorized access, file a report with: Why It Exists