Additional Sessions Judge Virender Bhat held Rahul (27), Ravi (23) and Vinod (23) guilty of the offences, saying they had gratified their "sexual lust upon the deceased by subjecting her to rape one by one".
"All the circumstances proved by the prosecution in the present case unerringly point to one hypotheses i.E. The guilt of the accused. Nothing has been brought on record which would point towards innocence of the accused.
The court has fixed February 17 for arguments on quantum of sentence.
Talking to the media after pronouncement of the verdict, parents of the victim said that the three deserved capital punishment for their acts.
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The three youths were arrested and booked for offences of kidnapping, unnatural sex, gangrape and murder of a girl on intervening night of February 9 and 10, 2012.
According to the prosecution, the girl, who was working as a data entry operator in Gurgaon's Cyber City, was kidnapped by the three youths in a car near her house in Qutub Vihar here and was gangraped and murdered by them on February 9, 2012.
Additional public prosecutor Satwinder Kaur had informed the court that the victim's mutilated body was found three days after the incident from a mustard field in Rodhai village in Haryana's Rewari district.