On 13 January 2010, Google announced that operators, from within China, had hacked into their Google China operation, stealing intellectual property and, in particular, accessing the email accounts of human rights activists. The attack was thought to have been part of a more widespread cyber attack on companies within China which has become known as Operation Aurora. Intruders were thought to have launched a zero-day attack, exploiting a weakness in the Microsoft Internet Explorer browser, the malware used being a modification of the trojan "Hydraq". Concerned about the possibility of hackers taking advantage of this previously unknown weakness in Internet Explorer, the governments of Germany and, subsequently France, issued warnings not to use the browser.