I hacked Citrix, says Russian hacker

https://en.wikipedia.org/wiki/Citrix_Systems

Citrix, a US software company specialising in virtualisation and cloud computing, has reportedly been compromised by a Russian hacker called w0rm.

w0rm is infamous for several attacks over the past five years on a number of high profile targets including the BBC, CNET, Adobe and Bank of America. The identity of the person or group behind w0rm is unknown.

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Story added 13. January 2016, content source with full text you can find at link above.