Conficker, also known as
Downup,
Downadup and
Kido, is a
computer worm that surfaced in October 2008 and targets the
Microsoft Windows operating system.
[1] The worm exploits a known vulnerability in the Windows Server service used by
Windows 2000,
Windows XP,
Windows Vista,
Windows Server 2003,
Windows Server 2008, and
Windows 7 Beta.
[2][3][4] The latest variant will begin checking for a payload to download on
April 1,
2009.
[5
Operation
The Conficker worm spreads itself primarily through a
buffer overflow vulnerability in the Server Service on Windows computers. The worm uses a specially crafted
RPC request to execute code on the target computer.
[6]
When executed on a computer, Conficker disables a number of system services such as
Windows Automatic Update,
Windows Security Center,
Windows Defender and
Windows Error Reporting.
It receives further instructions by connecting to a server. The instructions it receives may include to propagate, gather personal information and to download and install additional
malware onto the victim's computer.
[7] The worm also attaches itself to certain Windows processes such as
svchost.exe,
explorer.exe and
services.exe.
[8]
The worm seems to implement some of the ideas presented by Fucs, Paes de Barros e Pereira at the Blackhat Briefings Europe 2007, specifically: digitally signed additional payload, use of PRNG for communication and
P2P communication.
[9]