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Rule:
--
Sid:
2180
--
Summary:
This event is generated when a BitTorrent client connects to a tracker
to gain access to a BitTorrent network.
--
Impact:
Possible violation of policy and abuse of network resources.
--
Detailed Information:
BitTorrent is a peer-to-peer application used for simultaneous downloads
of large files. BitTorrent is designed to allow multiple peers to
download large files simultaneously without using extraneous bandwidth
from a centralized server.
BitTorrent's centralized server, called a tracker, refers peers to each
other. This rule looks for a request sent to a BitTorrent tracker from a
peer.
--
Attack Scenarios:
A user downloaded a BitTorrent client and attempts to download files
from a BitTorrent network.
--
Ease of Attack:
Unix, Windows, and MacOS clients are publicly available for BitTorrent.
--
False Positives:
Other web-based applications could use similar URLs and parameters.
--
False Negatives:
The URL path "/announce" is hardcoded in the BitTorrent tracker. If the
URL was changed in the tracker, then this rule would not generate an
event.
--
Corrective Action:
If this is a violation of network policy, take appropriate steps to
prevent further violations.
--
Contributors:
Sourcefire Research Team
Brian Caswell <bmc@sourcefire.com>
--
Additional References:
Bittorrent Protocol Specification
http://bitconjurer.org/BitTorrent/protocol.html
Wikipedia
http://en.wikipedia.org/wiki/BitTorrent
--
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