This undated GCHQ presentation gives an overview of the agency’s use of hacking techniques, including an explanation of what it perceived the legal position to be at the time: see the InterceptHow U.K. Spies Hacked a European Ally and Got Away With It, 17 February 2018.
This page from GCHQ’s internal GCWiki, last updated on 1 May 2012 documents progress in a variety of the agency’ projects: see Facing Data Deluge, Secret U.K. Spying Report Warned of Intelligence Failure, 7 June 2016.
This undated GCHQ reference document enumerates the processes and tools analysts use for computer network exploitation: see the Der Spiegel article The Digital Arms Race: NSA Preps America for Future Battle, 17 January 2015.
This extract from a 2012 GCHQ document details progress in the operation against Belgian telecommunications company Belgacom in the first quarter of 2012: see the Intercept article Operation Socialist: The Inside Story of How British Spies Hacked Belgium’s Largest Telco, 13 December 2014.
This GCHQ presentation from 2011 provides the background to the agency’s hacking attack on Belgacom: see the Intercept article Operation Socialist: The Inside Story of How British Spies Hacked Belgium’s Largest Telco, 13 December 2014.
This page from GCHQ’s internal GCWiki provides a guide to the NSA’s XKeyScore tool: see the Der Spiegel article The NSA in Germany: Snowden’s Documents Available for Download, 18 June 2014.