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Cybersecurity researchers say they have uncovered the biggest non-government botnet in recent years.
The botnet is most likely operated by an Iranian threat actor, GreyNoise reported.
They are also used for sending massive spam campaigns, distributing phishing emails or malware while avoiding detection.
Cybercriminals leverage botnets for credential stuffing and brute-force attacks, trying to break into accounts using stolen credentials.
Another frequent use is click fraud, where infected machines generate fake ad clicks to inflate revenue.
Botnets also enable cryptojacking, secretly mining cryptocurrency on victims devices, slowing them down and increasing electricity costs.
