The CERT Societe Generale (site is in French and English) has published a 6 Steps IRM Worm Infection cheat sheet (English only) freely available for download here. "Feel free to contact us if you identify a bug or an error in these IRMs." [2]

[1] http://cert.societegenerale.com/en/publications.html
[2] http://cert.societegenerale.com/resources/files/IRM-1-Worm-Infection.pdf

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