(also Downup, Downadup, Kido)
Conficker is a type of computer worm that targets Microsoft Windows operating systems. It first appeared in 2008 and quickly spread across the internet, infecting millions of computers worldwide.
The Conficker worm exploits a vulnerability in the Windows operating system that allows it to spread by copying itself to network shares and removable media that are accessible from an infected computer. When a user inserts an infected USB drive into another computer, the worm can spread to that computer and continue infecting other systems on the network. Once it enters a system, it is difficult to detect and remove.
After infecting a computer, Conficker tries to contact command and control servers to receive instructions from its owner. The worm can also disable security software and block access to security-related websites. It can download and install additional malware, which can be used by the attackers to steal sensitive information, take control of the infected computer, or launch attacks on other systems.