Amazon blamed (by security vendor) for unpatched OS , which resulted in Malware infection.

(Beauty of the Cloud)

According to the article:-

Bkav claims that AWS, a division of e-retailer Amazon, initially handed the customer a version of Windows Server 2003 that had not been patched since October 2009.

Hackers continuously scan the Internet for vulnerabilities in servers, so it is possible they found the unpatched OS and infected it with malware as soon as it was turned on, Anh said.

Bkav tested the cloud-computing services of Microsoft, Hewlett-Packard and GoGrid and claims to have found that Microsoft Azure was the only one consistently running updated versions of Windows. HP Public Cloud had some versions eight months out of data, while GoGrid had versions that had not been patched since April 2012

The link below has more information:-

http://www.csoonline.com/article/2147661/application-security/security-vendor-blames-amazon-for-customer-malware.html