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NSIS Error "Installer failed integrity test"


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#1 auzfix

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Posted 08 November 2011 - 05:38 PM

I hope this is the right place to post.

I have a laptop that needed new security software so I downloaded kasperky. When I try to run I get NSIS Error. The drives have been formatted and win xp home reinstalled along with drivers, thats about it. I tried downloading the file many times from kaspersky themselves as well as download.com.

I also tried to run it on my other laptop only to receive the same error. I was instructed to run malwarebytes and combofix (from the seller) which I did. Now that Ive read some posts on this site Im also concerned about having used combofix.

My laptops are both still working fine but using the net without any security software bothers me, please help

Wayne

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#2 Didier Stevens

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Posted 08 November 2011 - 06:12 PM

Can you check the digital signature of the file you downloaded?

Right-click Properties, select the tab Digital Signatures, select the signature and click on Details. Does it say "This digital signature is OK."?

Didier Stevens
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#3 auzfix

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Posted 09 November 2011 - 04:25 PM

It says "not valid"

#4 Didier Stevens

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Posted 09 November 2011 - 04:38 PM

It says "not valid"


OK, that is the reason why you get the NSIS error. The file you have is different than the one Kaspersky offers for download.
This is often caused by incomplete downloads, but can also be caused by file infecting malware.

Let's check for incomplete downloads first. Do you use more than one browser? For example Internet Explorer and Firefox? If so, download the file again with your alternative browser, and check the signature again.
If you only use IE, clear your temporary Internet files and then try again. You find this in the Internet options / General tab.
Check the signature again.

If the signature is valid, install the application.

Edited by Didier Stevens, 09 November 2011 - 04:38 PM.

Didier Stevens
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SANS ISC Senior Handler
Microsoft MVP 2011-2016 Consumer Security, Windows Insider MVP 2016-2019
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#5 auzfix

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Posted 14 November 2011 - 04:06 PM

Thankyou for the help. Allfixed now. Downloaded the same file from the same site but on a friends computer. Transfered to thumb drive and you know the rest. Thanks again
Wayne

#6 Didier Stevens

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Posted 14 November 2011 - 07:35 PM

You're welcome.

So it was an incomplete download.

Didier Stevens
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SANS ISC Senior Handler
Microsoft MVP 2011-2016 Consumer Security, Windows Insider MVP 2016-2019
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If you send me messages, per Bleeping Computer's Forum policy, I will not engage in a conversation, but try to answer your question in the relevant forum post. If you don't want this, don't send me messages.

 

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