These networks are used by financial institutions, military and intelligence agencies, the nuclear power industry, as well as even some advanced news networks to protect sources, according to La Repubblica journalist Stefania Maurizi.READ MORE: ‘CIA’s Cherry Bomb’: WikiLeaks #Vault7 reveals wireless network targetsThese newly released documents show how closed networks not connected to the internet can be compromised by this malware. However, the tool only works on machines with a Windows operating system.Firstly, an internet-connected computer within the targeted organization is infected with the malware. When a user inserts a USB stick into this computer, the thumbdrive itself is infected with a separate malware.Once this is inserted into a single computer on the air gapped network the infection jumps – like a kangaroo – across the entire system, enabling sabotage and data theft.RELEASE: CIA air-gap jumping virus 'Emotional Simian' https://t.co/KkBnXhNtGCpic.twitter.com/w6MZFGushc— WikiLeaks (@wikileaks) June 22, 2017If multiple computers on the closed network are under CIA control, they “form a covert network to coordinate tasks and data exchange,” according to Wikileaks.Data can be returned to the CIA once again, although this does depend on someone connecting the USB used on the closed network computer to an online device.