是什么启动了古老的“ Update Helper”，又如何确定它不是特洛伊木马？

有时，某个程序会突如其来地困扰我进行更新。我很少屈服，因为我总是怀疑木马。例如，今天我得到了一个持久性： I launch Activity Monitor and sure enough, there is indeed a process with that name. Yet after the last upgrade (to El Capitan) I didn't bother installing either Google Chrome or Google Earth. I confir...