Yes. Allah ordered the punishment for theft in the Quran (5:38), which shows that it is a serious sin. Taking another person's property wrongfully in any way is forbidden.
Quanto ao ladrão e à ladra, decepai-lhes a mão, como castigo de tudo quanto tenham cometido; é um exemplo, que emanade Deus, porque Deus é Poderoso, Prudentíssimo.
This is general information, not a fatwa. For your own situation, ask a qualified scholar.
Questions about halal and haram
Is stealing haram?
Yes. Allah ordered the punishment for theft in the Quran (5:38), which shows that it is a serious sin. Taking another person's property wrongfully in any way is forbidden.