Problem has been rumbling on for months
Users who search for major Chinese cities see spam from accounts that appear to be bots
The email warned of a fake cyber campaign and pinned the blame on a specific security researcher
Malicious emails peaked in March
Users will be warned when they see or send a suspected spam message
The only elections Levashov may have tried to 'hack' are Russian ones
Trojan's authors change tactics in apparent attempt to infect businesses with crypto-malware
Fallen 'spam king' pleads guilty to sending 27 million messages using 500,000 Facebook accounts
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