Hackers of adultery website Ashley Madison used AC/DC’s “Thunderstruck” to alert company employees to the security breach.

According to Billboard, when Avid Life Media employees logged onto their computers following the hack, they discovered a message from hackers accompanied by the 1990 song.

Avid Life Media is the parent company of the adultery website.

From Billboard, “Lyrically, the hit song is about finding yourself ‘caught in the middle of a railroad track’ after a wild night of partying with women. ‘You’ve been thunderstruck,’ goes the chorus. It’s not hard to see how this played into the hackers’ agenda.”

Avid Life Media is offering a $500,000 reward for any information leading to the prosecution of the hackers who managed to breach over 33 million accounts.

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