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Let's say there is a particular network which has a "monthly" successful cryptolocker attack. Every time, every computer in that network is infected.

The set up is like this:

  • 1x Windows 2003 server (SMB1)
  • 4x Windows 10 Client computers

Every time, the server and 3x Windows 10 machines are infected. 1 machine remains unaffected.

They are all part of the same domain.

Is it possible, that a virus infection resides on that one computer that never gets infected, and spreads the crypto onto the other machines without infecting it's host? Has anyone experiences likewise behavior?

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    The machine that is spreading the virus in this scenario would be infected, it would just not be encrypted. And yes, this is theorethically possible. Does it happend in practice? I have no idea. – Anders May 23 '19 at 19:09
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The concept you are looking for is "persistence". You don't want to destroy your route to continue to extort the victim.

If you encrypt the machine that is your route in, then the victim will reformat/reinstall the operating system and wipe out your route in.

So, you leave the one machine (likely the first infected machine) alone, but launch attacks from it to the rest of the network.

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I don't see how it is possible for a virus to spread from a computer that is not infected. With that in mind, security updates for Windows server 2003 stopped in 2015. Since that date, a number of vulnerabilities have been identified:

https://www.cvedetails.com/product/7108/Microsoft-Windows-Server-2003.html?vendor_id=26

This could leave the machine wide open to automated attacks.

This vulnerability is oddly consistent with the configuration you are describing:

https://www.cvedetails.com/cve/CVE-2017-0176/

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  • In this scenario the computer would be infected (or compromised at least), the attackers would have just left it in such a state so that it seemed untouched so that no one would bother wiping/restoring it, thus persisting the attack. It's certainly possible: whether or not it happens is another matter. – Conor Mancone Sep 14 at 23:35

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