Optus, one of Australia's largest telecommunications companies, recently suffered a data breach that affected over 9.8 million customers.
The telecom giant is not sure who was behind the cyber attack, but did admit that some identity documents may have been compromised. SBS News recently reported that the company's data is already being leaked to sites on the Dark web, including a extortion threat that the info would be released unless Optus replied:
Source: SBS News
This data breach should be a big learning lesson to organizations all around - the ramifications of this are solely due to social engineering tactics.