Anonymous hackers have targeted Twitter this week and gained access to roughly 250,000 user accounts though only "limited information" such as email addresses was compromised, the microblog said on Friday.
Twitter has already reset passwords for affected users, and will notify them soon, it said in a blog post. The cyberattacks come days after the New York Times and the Wall Street Journal revealed they had been the target of a well-coordinated hacking effort.
"This attack was not the work of amateurs, and we do not believe it was an isolated incident," Twitter said. "The attackers were extremely sophisticated, and we believe other companies and organizations have also been recently similarly attacked."
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Chinese Hackers had attacked The New York Times on Jan.30, 2013.
Chinese hackers, having government links, have hit the media company including The Wall Street Journal. The report says that attackers apparently spied on reporters covering China and other issues, according to The Wall Street Journal.
According to Forbes, the hackers tried stealing login credentials and info from its reporters and employees by infiltrating their systems.
U.S. media companies had been the hacker's target for several years.
According to The Wall Street Journal, the attackers could allow Beijing to identify sources on articles and information about pending stories by just tapping the reporters' computers.
Moreover, PC mag added that an October story about the wealth of China's prime minister, Wen Jiabao, was reportedly attacked to know details about sources to whom Times' reporters spoke. Particularly, they targeted the email accounts of David Barboza, the Times' Shanghai bureau chief, and Jim Yardley, the paper's South Asia bureau chief in India, who lately held the Shanghai post.
Chinese Embassy representative Geng Shuang condemned allegations of Chinese cyber-spying.
"It is irresponsible to make such an allegation without solid proof and evidence," he said. "The Chinese government prohibits cyberattacks and has done what it can to combat such activities in accordance with Chinese laws," according to The Wall Street Journal.
On the other hand, the PC mag reported that the hackers installed 45 pieces of malware, out of which, antivirus software from Symantec detected only one. Moreover, the company found only one instance in which Symantec identified an attacker's software as malicious and quarantined it, according to Mandiant.
"To get rid of the hackers, The Times blocked the compromised outside computers, removed every back door into its network, changed every employee password and wrapped additional security around its systems," the story said. "For now, that appears to have worked but investigators and Times executives say they anticipate more efforts by hackers."
Just few weeks back there was an attack on Java and now the media. We must prevent these attacks and treats that merge every day.