On May 30, 2015, the Iranian hackers J0K3R and -N4tw0rk- of the new hacker group "Zero Security", along with Dragon from Iran-Cyber Security Team, successfully hacked and defaced a large number of Dutch and Ukrainian websites. The defaced pages featured the following images:
Source: Irancybernews.org, May 30, 2015.
June 2, 2015