I'm monitoring the site 24h/day and it's been working for 20+ hours, although at times it's still timing out.
Virwox has their server hosted on a server that has "DDOS protection" which basically means they get attacked like any other site, but they will block certain IPs. Those blocks usually last about 6 to 8 hours, after which they are lifted.

Current access time averages out to about 5~10 seconds, which means the DDOS is probably still going on, but less than before.

The VirWox site seems to be operational again, since about 6AM UTC today (november 2nd, 2017) - but i'm still seeing request times that vary between 0.5s and 10s. It will take a while for it to stabilize again.

It started experiencing problems around 1PM UTC on oct. 31st and 8 hours later almost completely blacked out for a duration of another 32 hours.

[edit]... and it's offline again!

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Does anyone have a channel that has active content about Virwox?  Their twitter account has been inactive for the past 5 years give or take, and those that have tried know that emails most of the time are replied to, but usually not very fast and with little information. I've searched for some channel about Virwox for the past 5 years, but all i found so far is just a couple forum posts here and there..

Since i know there's a lot of people using their service to buy & sell Bitcoins for USD and EUR, there should be a fixed place for conversation and information about their service. I'm willing to set up a website for that, if there isn't already. Replies to this thread are highly appreciated, so i know what steps to take.

I've mailed them. Got a one-liner as a return:
That was yesterday, after about 12 hours of being offline.

It is also good to notice that sometimes i can get through to the site... about once an hour or so, for few seconds only, before it becomes unresponsive again. Also PINGs won't work much either (they usually do work, even if their server has its famous Bad gate "nginx" apology). Seems likely they are indeed under attack. This has happened before, few months ago.