Security experts at Securi firm have recently detected a series of SQL Injection attacks conducted abusing of the Google Bot activity. The exploitation of search engines like Google and Bing to conduct an attack represents an optimal choice for hackers that intend to stay hidden during the offensive. Google Bot could also be abused to attack a targeted site. Security experts have already advised Google about the possible abuse of its Bot activity, site admin are advised, before to trust any source it is necessary a further level of inspection.”]
Source: http://securityaffairs.co/wordpress/19514/cyber-crime/google-bot-sql-injection-attacks.html