I have a good friend that told me the same story, she used Sistemkoin a few times and withdraw all good, then one day she withdraw about 1.5 btc and the coins sent to another address not her, she complain to the exchange and they told het that was her fault, i check the email and the address was correct, she try to contact them trough chat support and the chat window dissapeared, she though this was strange so when i access the site i can see the chat window, so i try to chat with them and they also blocked me too. this happened around February
This kind of proves that it's a scam. If they were hacked or infected with replace address malware, they'd get another email which contains the malicious address. Without triggering an email, only someone from within the company could initiate a withdrawal to the wrong address.
Do they have an account to tag, here?
i actually have a copy of the email and screenshot of my friend address. i will need to ask permision to post it here.
But she input the address on systemkoin withdrawal page, then she received an email saying that she want to withdrawal x amount to her withdrawal address, her withdrawal address is correct on the email and that was the only withdrawal email she received,
then the coins never arrived at destination.
when i help her to find out what happened, we discovered that the Tx id that shows on her history on Systemkoin has as receiver of her coins another address, but the amount is right.
this happened to others too, if you do a quick search on twitter or google you will find reports of this.
It is probable that some systemkoin insider is maybe stealing, and not the exchange, maybe is their support involved in this and the owners are not aware, i am just speculating in this.