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Virus inside a rar or zip file

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#1 sudhi_gs


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Posted 11 May 2011 - 08:51 PM


I am setting up a backup system for my pc, backsup to a remote machine via ftp. The files to backup will be compressed into a zip file and then backed up to the remote machine. My question is, if my pc gets infected with a virus and those files backed up to the remote machine, will the virus infect the remote machine as well ? (if the files are not unzipped on the remote machine & both machines running on windows Xp pro). Appreciate any help or suggestions in this.


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#2 Didier Stevens

Didier Stevens

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Posted 12 May 2011 - 06:04 AM

No, malware inside a ZIP or RAR file can't infect a machine, unless you extract the malware (and execute it).

So in your case, the simple fact of storing a ZIP backup on a remote machine will not infect that remote machine.

That's why malware researchers share malware samples in password-protected ZIP files.

Didier Stevens

SANS ISC Senior Handler
Microsoft MVP 2011-2016 Consumer Security, Windows Insider MVP 2016-2019


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#3 sudhi_gs

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Posted 12 May 2011 - 06:49 PM

Thanks Stevens, I will confidently go ahead and implement my backup system.

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