Gurucharan Kalluraya, a former employee of ARINC which maintained the Common Use Passenger Processing System and Baggage Reconciliation System at the IGI's Terminal-3, was allegedly not happy with the treatment received from the company, CBI sources said.
They said Kalluraya claimed that he was not happy with the salary and the lack of recognition for the hard work he had put in to design the efficient system.
Kalluraya, who has a mother and a sister in the family, had claimed that there was no effort to retain him when he offered to resign, the CBI sources said.
The company, however, used to keep calling him whenever problem came in the system even after he left the firm.
Frustrated with the company, Kalluraya allegedly decided to teach the company a lesson and scripted a new virus "all by himself" which was capable of stalling the check-in and baggage claim system of the airport, they said.
Kalluraya transferred the virus on the system, leading to outage of check-in and baggage claim services of the swanky Terminal 3 for 12 hours on June 29 last year which resulted in cancellation of many flights.
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The probe agency carried out searches and recovered the pen drive and hard disks of his laptop.
In its charge sheet filed before the chief metropolitan magistrate at Tis Hazari court, the CBI alleged that forensic examination of his laptop, pen drive, the logs of cyber cafe used by him have revealed the presence of virus used to stall the operations at the IGI airport.