You can email SingCERT at
singcert@csa.gov.sg or access SingCERT's Cyber Incident Reporting form at
https://www.csa.gov.sg/singcert/reporting.
Please note that our operating hours are Monday to Thursday from 8:30am - 6:00pm (GMT+8) and Friday from 8:30am - 5:30pm (GMT+8).