may be this hack is real because transfers are in small amounts .. seems like attacked
If it was a hack, transfers would have done in minutes or hours and mixed within 24 hours, last transfer from so called hacker's wallet 139+ BTC on 16 April 2018. 8 days to transfer BTC from first address.
Hacker and Coinsecure+Cyber Cell playing Hide n Seek?
It is obvious that if the hackers have done so then the transactions would have been very fast and a huge amount would have been transfered in a very short time period.