This is a good example on the broader issue about the fungibility of cryptocoins, and this is what the for privacy cryptocoin advocates have been arguing about. Full transparency on the blockchain is not absolutely good.
As suggested by gentlemand. The hackers' only hope is to ransom those coins. I hope they are smart enough to accept a private and fungible coin hehehe. Accepting bitcoin will only expand their problems.
Reiger had previously told CoinDesk that his group was tagging accounts containing stolen XEM. His team also helped develop a system to automatically flag any stolen XEM, as well as the accounts they appeared on.
On Wednesday, The Japan News reported that the stolen XEM was transferred to 20 different accounts over the course of five days, with a series of transfers on both Jan. 26 (Friday) and Jan. 30 (Tuesday). The newspaper further stated that the Metropolitan Police Department was investigating these transfers as a possible attempt at slowing the investigation into the actual hack.
The Japan News further claimed that nine different accounts each received at least 11,000 yen.
It is unclear where The Japan news received its information from. The NEM Foundation declined to confirm the report's claims.
In its statement, the NEM Foundation noted that it would be difficult for the hacker to liquidate most of the stolen XEM, and the token's developers were continuing to monitor the accounts regardless.
Read the full article https://www.coindesk.com/nem-foundation-refutes-exchange-news/