The CERT Societe Generale has released another cheat sheet for Distributed Denial of Service (DDoS) freely available here. "This Incident Response Methodology is a cheat sheet dedicated to handlers investigating on a precise security issue." [1]

[1] http://cert.societegenerale.com/resources/files/IRM-4-DDoS.pdf

Previously published cheat sheet:

Worm Infection - http://cert.societegenerale.com/resources/files/IRM-1-Worm-Infection.pdf
Windows Intrusion - http://cert.societegenerale.com/resources/files/IRM-2-Windows-Intrusion.pdf
Unix Intrusion - http://cert.societegenerale.com/resources/files/IRM-3-Unix-Intrusion.pdf

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Guy Bruneau IPSS Inc. gbruneau at isc dot sans dot edu