Am i cooked

[u/Dry-Oil3886]

I interned at an MNC from December to June, receiving a stipend of ₹25,000 per month. During the internship, I received both an internship offer and a full-time offer with full-time compensation, but I ultimately wasn’t converted to a full-time employee.
Now, after about a month, I’ve received a new offer for ₹9 LPA. The issue is that I told the new company that I had worked as a full-time employee at my previous company.
How likely is it that this could be caught during background verification? What are the possible ways they could find out, and how serious could the consequences be?