Here's looking at you Kido
Vitaly Kamluk · Network Security · 2009
Now notorious for reaching worldwide epidemic proportions, the Kido family (otherwise known as Conficker or Downadup) is a polymorphic network worm that spreads mainly by exploiting a critical vulnerability in the Microsoft Windows operating system. Not only has Kido led to the biggest epidemic for several years, but it implements a wide array of tricks designed to make it difficult to analyse and hard to remove from infected systems, making it one of the most dangerous current pieces of crimeware.