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Message-ID: <4017984D.20232.90A4F0C1@localhost> From: nick at virus-l.demon.co.uk (Nick FitzGerald) Subject: Mydoom Vlad Galu <dudu@...spar.rdsnet.ro> wrote: > "Ferris, Robin" <R.Ferris@...ier.ac.uk> writes: > | > |Does any one know what the size of the attachment is when is comes in > |as a zip file? > > It's the <compressed size>/<ratio>. Admit it -- you're just guessing! Mydoom makes its zip form by gluing together a .ZIP header for a single, stored (i.e. not compressed) file, the whole of the virus binary and a suitable one-file .ZIP central directory. As the size of the first and third components depends on the length of the filename, the .ZIP is not of constant size because Mydoom uses different length filenames. And, as I explained earlier, even the size of the .EXE can vary, adding yet another inconstancy to the equation. -- Nick FitzGerald Computer Virus Consulting Ltd. Ph/FAX: +64 3 3529854
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