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Summary:Online censorship watchdog Greatfire says that Microsoft was attacked over the weekend, causing havoc for Chinese users.

Greatfire.org Microsoft's Outlook email service was subject to a cyberattack over the weekend, just weeks after Google's Gmail service was blocked in China.

On Monday, online censorship watchdog Greatfire.org said the organization received reports that Outlook was subject to a man-in-the-middle (MITM) attack in China. A MITM attack intrudes on online connections in order to monitor and control a channel, and may also be used to push connections into other areas -- for example, turning a user towards a malicious rather than legitimate website.

After testing, Greatfire says that IMAP and SMTP for Outlook were under a MITM attack, while the email service's web interfaces were not affected.

A screenshot of the attack is below:

Greatfire.org

The attack, dubbed "especially devious" by Greatfire, involved a pop-up warning message in the email client. Unlike in the case of browser warnings, users are more likely to quickly click the "continue" button on the message without actually reading the message or considering risk factors -- potentially attributing the warning to a network issue instead and therefore nothing to be concerned about.

Once clicked upon, the user's emails, contacts and passwords could then be logged by the cyberattackers.

According to Greatfire, the attack lasted for approximately a day and has stopped -- at least, for now.

The cyberattack on Microsoft systems comes after recent MITM attacks which reportedly have taken place against Google, Yahoo and Apple in China. It is only weeks since Google's email client, Gmail, was blocked in the country well-known for its tough censorship laws. Since 26 December, Gmail users in China have been unable to access the service, even if they use a third-party service -- such as Outlook -- to access their messages. Currently, VPN circumvention of the block is the only way to use Gmail.

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Microsoft Outlook hacked following Gmail block in China