Two-thirds of responding companies have been attacked via collaboration tools in the last 12 months. Hackers have had great success using phishing techniques. With the credentials to a collaboration account in hand, hackers could perpetrate all sorts of mayhem by posing as an employee. With a bit of social engineering, hackers can get their prey to open the document, thus unleashing the malware. Before opening a document, employees must ensure that they are not walking into a hacker-laided trap.”]
Source: https://www.darkreading.com/application-security/4-ways-at-work-apps-are-vulnerable-to-attack