This article's lead section contains information that is not included elsewhere in the article. (April 2023)
On 31 March, 2022, SentinelOne researchers Juan Andres Guerrero-Saade and Max van Amerongen announced the discovery of a new wiper malware codenamed AcidRain designed to permanently disable routers.  Viasat later confirmed that the AcidRain malware was used during the 'cyber event'. AcidRain shares code with VPNFilter, a 2018 cyber operation against routers attributed to the Russian military by the FBI.  On 10 May, 2022, the European Union condemned the attack targeting Viasat's KA-SAT network as a Russian operation. 
The Viasat hack led Ukraine to deem Starlink as a potential solution for communications amidst the war as Russia had damaged or destroyed other means to communicate and get Internet within the country.
Viasat Analysis Edit
According to Viasat, the attacker used a poorly configured virtual private network appliance to gain access to the trusted management part of the KA-SAT network. The attackers then issued commands to overwrite part of the flash memory in modems, making them unable to access the network, but not permanently damaged. The satellite itself and its ground infrastructure were not directly affected.
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- KA-SAT Network cyber attack overview - from Viasat