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I wish to analyze the changes made by a specific virus. For example, 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
    
Can you say me which tools you are using for the analyze? –  The All Seeing Eye Jun 17 '13 at 14:33
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6 Answers

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
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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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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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Here is the answer to my great question

I have checked and Tekdefence is the only simply browsed. Open Malware. responds with some list if I enter "windows" into the MD5 search windows. Others are useless forums or others require registration. Malshare also provides search without registration but, it requires MD5 hash. I have no idea how to get it.

Contagio

KernelMode.info

DamageLab.org

MalwareBlacklist

Malware.lu

Malware URLs.

Open Malware.

virusshare

maleware.lu

An Blog which has some url's

Malshare

Tekdefence

MalwareTIps - Virus exchange Forum

The above url's are An Summary from here

Hope it helps

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