A Windows zero-day vulnerability which got patched by Microsoft as part of the company’s April 2019 Patch Tuesday together with 73 other flaws could allow potential attackers to take full control of vulnerable systems. The vulnerability was used by threat actors to “make a trivial HTTP reverse shell”” (also known as a reverse shell) as a part of a three-stage exploitation procedure which would eventually help “”the attacker gain full control over the victim s system”” The active exploitation of this vulnerability shows that bad actors have really embraced the use of readily available tools such as the omnipresent PowerShell to run their malicious tools.”
Source: https://www.bleepingcomputer.com/news/security/patched-windows-zero-day-provided-full-control-over-vulnerable-systems/