"Dozens of iOS apps in Apple's App Store were infected with malware in recent days, including hugely popular Chinese social networking apps, in what appears to be the first major case of hackers breaching Apple's highly controlled mobile software ecosystem."
Some of the popular apps affected:
"WeChat, which has more than 500 million users in all, said its app was affected by the issue but that it had already fixed the problem earlier this month. It said its version 6.2.5, released on Sept. 10, was infected, but version 6.2.6, released Sept. 12, was not..."
How the breach happened:
"Both the app developers and Apple were apparently unaware that the apps had been infected. Hackers succeeded by tricking the app developers into downloading a modified version of Xcode, the software that developers use to create iOS apps. This fake version of Xcode included the malware, which then made its way into the apps, which were then uploaded to the App Store."