A chain of events that led to a record-breaking $6.3 billion mega-hack began with a dodgy download, so says the company that was hacked, Binance.

The world's largest cryptocurrency exchange says that the hack was not a "single isolated breach or simple phishing incident"; multiple steps were required to break through its security measures. It all began when a Wallet DevOps engineer (named Engineer A) downloaded a tampered Homebrew installation that was suggested to them by an unnamed search engine.

Homebrew is a third-party package manager for macOS. A report from the SANS Technology Institute, linked to in Binance's investigation, suggests that malicious adverts for Homebrew have been spotted in search engine results, hoping to ensnare users into installing malware on a user's PC.

"Our security team detected the anomaly, replaced the device, and rotated all related credentials as a proactive security action," Binance says. "However, Engineer A’s role and his related colleagues on our wallet infrastructure team was exposed to the hacker."

Then came a separate incident with a software engineer (named Engineer B). They were contacted through a job hunting platform (Binance says it was a legitimate platform) and was asked to attend a first-round interview with a HR representative. This was followed by up a second-round interview with the CEO. Not the HR representative, nor the CEO, however, were real; the company was made up.

The aim of the interviews? To offer Engineer B an 'assignment' that was really a repository of malicious code that executed during setup.

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