ZmEu is a computer vulnerability scanner which searches for web servers that are open to attack through the phpMyAdmin program, It also attempts to guess SSH passwords through brute-force methods, and leaves a persistent backdoor. It was developed in Romania and was especially common in 2012.
It is apparently named after Zmeu, a dragon-like being in Romanian folklore.
References
ZmEu (vulnerability scanner) Wikipedia(Text) CC BY-SA