: Accessing linked services like social media, cloud storage, or financial apps through password reuse.
: Hackers use automated tools to "check" the credentials against mail servers (SMTP/IMAP). If the login works, it is added to a "valid base" file, which is much more valuable than raw, unverified data. 530k Mail Access valid base.txt
: Impersonating executives to authorize fraudulent wire transfers. : Accessing linked services like social media, cloud