Well, I think there are a plenty of articles that with an initial study you may find out in which area of auditing you are interested in working on, furthermore data collection in which topics is possible in your environment? Please have a look at the attached files, I hope there are useful for you.
I think it would be very interesting to look at some financial statements and see how businesses in the same sector reported during Covid-19, especially with regards to state aids. Another, more interdisciplinary topic would be "Are women the better auditors?" where you could encorporate many KPI's and managerial theories as well.
If you were my Thesis Student, I would encourage you to look at the three-way conflict between Auditee rights vs Auditor convenience/access, vs verification of data provided. In Australia, when someone applies for an aged pension (means tested) the data is exhaustively verified before a decision is made -- it may be more socially efficient to do the exhaustive audit only after a decision has been made to award a pension--this would save unsuccessful applicants large amounts of effort and aggravation. In doing the masters thesis, a model of costs and consequences would need to be developed. Good Luck on whatever you choose to do -- make sure that you find you question interesting and enjoyable -- you will be doing it for awhile and it may ladder up into a PhD thesis.
Please note: the data set needed to make a negative decision is often of lesser quantity and quality than the data set needed to award a positive decision.
It would be significant contribuation to investigate the effect of Business Volatility,Uncertainty, Complexity and Ambiguity (VUCA) on Auditing Process: practical guidelines.
I'd suggest aiming for a topic that is both interesting and relevant to either to your doctorate or a future career position. Any or all of the following easy-to-read articles may help give your literature review a boost as they cover a variety of audit topics including fraud upon which you can expand in your thesis:
Article Payroll internal audit: On the hunt for payroll fraud
Article Improving the bottom line: Achieving material cost recoverie...
Article The dollar value of error-seeking audits
Article CASE STUDY: Drive for effectiveness: A motor vehicle fleet a...
Technical Report Increasing Internal Audit's Influence With Monte Carlo Analysis
Article Retail point of sale fraud prevention and detection using in...
Article Beneath the data: Using self-service business intelligence d...
Article Enlarging Internal Audit results with Action Research methodology