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A botnet sinkhole is a target machine used by researchers to gather
information about a particular Botnet sinkhole botnet.
Sinkholing is the redirection of traffic from its
original destination to one specified by the sinkhole owners. The altered
destination is known as the sinkhole. (The name is a reference to a physical
sinkhole, into which items apparently disappear.)
Sinkholes can be used for good or ill intent. Most
commonly, sinkholes are used to redirect zombies in a botnet to specified
research machines to capture data about them.
In a centralized botnet, sinkholing is straightforward.
The discovery of a C&C (command and control) server makes it possible to
redirect DNS requests for that server to a law enforcement computer or other
analyzing machine. The specially configured DNS server can simply route the
requests of the bots to a faked C&C server, where the requests provide
information to researchers about the nature of the botnet. To establish this
type of botnet sinkhole, researchers need the cooperation of the owner of the
DNS used by the botnet, as well as knowledge of the botnet and its C&C
server.
Since there is no C&C server in a decentralized or P2P
botnet (peer-to-peer botnet), the researcher has to detect its method of
picking up owner commands before any attempt can be made to block or analyze
the botnet's communication.
Other methods used to effectively sinkhole botnet DDoS
(distributed denial of service) traffic include locally rerouting
traffic through changes via Windows updates or to a hosts file.
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