From were?

There have been several threads about people who's money was sent to the same group of addresses. We are still trying to figure out how the computers are being compromised.

Could you give us a list of bitcoin related downloads you have made.
Do you feel like your computer is susceptible to traditional viruses?
Do you have your wallet online anywhere unencrypted?
Have you run any namecoin binaries?

can anyone verify this adress:
18hMx774ULBKJKMbwo5reBm3zW8unJ92FW

?

my btc-client told me, I transfered the btc I got earlier from deepbit (but i didn't transfer anything)

my client sent 0.46 btc to this address today.. by itself.
im on win7x64 with latest updates, scanned the whole pc, checked open ports and autoruns.. and nothing.

i need help cus this is serious, if my antivirus and 4 anti-troyan apps say my windows is clean and it clearly isnt, there is something wrong.

Sure it was sent by your client, or did you store your wallet.dat somewhere else as well?  Look up the transaction ID in blockexplorer, and search for the first 20 bytes of it in debug.log.  (It is in ~/.bitcoin/ under Linux.  Have no idea where Wintendo stores it.)  If you see an "askfor tx transactionid" somewhere, the transaction was initiated by someone with a copy of your wallet.dat.  It looks like your own, because you have the same wallet.

I'm 99% sure now that someone hacked into my dropbox account, where I stored the first backup of my wallet.dat a few months ago, when I started mining. The file was compressed and with a rather long password, but I assume It wasn't a problem for some bruteforce app to crack it.
I'm so glad that this was my very old backup and I lost only 0.46 BTC (doing encrypted backups only on usb drives now)

btw http://techcrunch.com/2011/06/20/dropbox-security-bug-made-passwords-optional-for-four-hours/

goodbye dropbox...

thats why I'm leaving, got no email from them about this security issue, ridiculous
gonna try skydrive + truecrypt combo now

OP, how strong was your password on the zipped wallet that was on DropBox? How many chars, and what kind of mixture of lower case, upper case, numbers, punctuation, etc, did it contain?

And what format was the zipped file in? WinRAR?

I hate when people make these posts and make you ask every little detail in order to try to help them figure out what may have happened. It's like pulling teeth. Just fucking give us all the info instead of making us ask for every little thing. Don't make assumptions like "I'm 99% sure that XYZ happened" and then think that posting additional details is no longer of any use. You are of course free to make your assumptions about what might have happened, but at least post all the necessary info that is required to come to that conclusion. If you leave things out like the info I asked above, you leave the possibility in everyone's mind that your zipped & password protected file might actually have been impossible to brute force. And then the community still has no idea what happened in your case and we are no closer to figuring out how people are getting hacked, and your entire thread was a waste of everyone's time. That also leaves open the possibility that all the "I was hacked" threads are troll or FUD threads.

Sorry, OP, this is not meant to single you out. This is a common theme in all the "My BTC was stolen due to hack" threads.

Sorry to hear about your loss nakowa. I hope you did not loose too much.

Please notify all the major exchanges about this so they can keep an eye on transactions flowing from those two addresses.