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WhatsApp and Signal messages at risk of surveillance following EncroChat ruling, court hears | Computer Weekly
(www.computerweekly.com)
This is a most excellent place for technology news and articles.
The headline is a little misleading. The actual ruling is that police can obtain warrants to install surveillance malware on phones when they have evidence the owner is using it to communicate about crimes.
Could malware be installed without access to the physical phone? How would this be achieved. Is it with a backdoor from the phone manufacturer or infected somehow from the sim card service provider.
Depending on circumstances it can be done remotely in different ways AFAIK using things like IMSI Catchers, malicious and sometimes invisible SMS messages, and maybe spearfishing or other methods. Or a combination of things, leveraging different weaknesses of the phone in question.
This is much much harder though, and would risk exposing the vulnerabilities they are using, so they likely won't use these methods unless it's higher profile and involves some higher up govt entities. Your normal street crime cop shop won't be able to do this.