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I wish to analyze the changes made by a virus like Win32.Sality. Where can I get the sample of this, or other similar, malware for testing?

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And do AV editors in general have some official feed for malware? – curiousguy Aug 19 '12 at 18:22
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+1, always wondered this: where is malware when you need it?! – Luc Aug 19 '12 at 19:00

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Contagiodump blog and the spam folder are your best friends

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Would be the first time ever that my spam folder contains malware. – Luc Aug 19 '12 at 19:25
@Luc Let me guess, gmail? ;) – Polynomial Aug 19 '12 at 19:59
@Polynomial Hotmail actually – Luc Aug 19 '12 at 22:25
up vote 5 down vote

Offensive Computing has about 4,456,929 samples.

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You can always run your own honeypot.

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http://www.malware.lu/ Has 2,236,674 samples

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up vote 1 down vote

virusshare.com is another great repository of malware samples, having a huge number of samples. A snapshot from the website's homepage:

enter image description here

Access is by invitation only, so you will need to drop a mail to the site admin.

Another good resource that I know of- www.deependresearch.org

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