In April 2012, several stories were published about a mysterious malware attack shutting down computer systems at businesses throughout Iran. Kaspersky Lab has analyzed hard drive images that were attacked by Wiper. We can now say with certainty that the incidents took place and that the malware responsible for these attacks existed in April 2012. We are aware of some very similar incidents that have taken place since December of 2011. The creators of Wiper were extremely careful to destroy absolutely every single piece of data which could be used to trace the incidents.”]
Source: https://securelist.com/what-was-that-wiper-thing-48/34088/