Slack has been gain popularity over past few months and has been valued at a whopping $2.8 billion by its investors. The hack was noticed by the Slack security team who made a post on their website announcing the same. Though the hack occurred in February, it took more than a month for Slack to announce the hack. It also announced that it had enabled 2 factor authentication after the hack attack. “This further highlights the need for all organizations – both startups and established companies – to invest in post-infection software that can quickly identify security breaches and prevent valuable data theft,” said Paul Martini, CEO of iBoss, a cybersecurity provider. Slack has been criticized for its security practices in the past. In October 2014 for a design flaw which left its chat room names visible and open to anyone. After a furore online, Slack denied that the design flaw was a bug.