Fresh news about the issue coming from Synology forums:
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The AnandTech article was updated a bit ago:
http://www.anandtech.com/show/8337/synology-advises-users-of-synolocker-ransomware
"Synology has finished analyzing the exploit and confirmed which versions of DSM are vulnerable. The vulnerability in question was patched out of DSM in December of 2013, so only servers running significantly out of date versions of DSM appear to be affected.
In summary, DSM 5.0 is not vulnerable. Meanwhile DSM 4.x versions that predate the vulnerability fix – anything prio