malicious

adjective
1
having or showing a desire to harm somebody or hurt their feelings, caused by a feeling of hate
کینه‌توز, بدخواه, شرور, خبیث, بداندیش
synonym malevolent, spiteful
2
intended to damage somebody's computer or data files
خرابکارانه, مخرب
These are nasty pieces of malicious code such as viruses, Trojan horses and worms.
malicious software/applications