iTWire Wednesday, 14 April 2021 17:54 FBI cleans up Web shells on Microsoft Exchange Server installations Featured Image by Clker-Free-Vector-Images from Pixabay The FBI has intervened to clean up the mess left by attacks on on-premise Microsoft Exchange Server installations after obtaining court orders to access hundreds of vulnerable machines in the US and remove Web shells. In a statement issued on Tuesday, the Department of Justice said these servers had been exploited in January and February by some groups who used zero-day vulnerabilities that Microsoft publicised on 3 March. More groups piled on in March while some of the earlier Web shells were removed by the owners, the statement said.