There is a process for that. The National Accountability Bureau would investigate allegations of financial impropriety during a time period that the individual (politician or bureaucrat) was in government. My understanding is that the military has a separate mechanism for investigating such irregularities, but someone with more knowledge can clarify
@PanzerKiel @blain2 @jaibi @Ark_Angel
The issue here is that the majority of the allegations revolve around the business of Bajwa's brothers in the US, that Asim Bajwa is not personally involved in. So, for example, if my brother goes into government and my business expands in the US during the time he's in government, does that automatically mean he funneled funds to me? In fact (and this is true), I have given my brother a small share in my company as compensation for some of his occasional assistance with resources etc in Pakistan -- just because he's my brother.
A real 'investigative report' should have focused on any potential abuse of power by Bajwa while he was in the military - show us where he was in charge of contracts/projects and there was evidence he extorted money or demanded bribes or funneled funds away. Show us evidence that he was purchasing homes or cars beyond his sources of income at that time.
Merely pointing to the success of someone's extended family isn't enough.
There are some allegations about companies 'set up by Bajwa's sons', but setting up a company isn't a problem nor is it something that requires a lot of money - setting up a company is mostly paperwork and some fees. Funneling contracts to said companies while in power or said companies having enormous amounts of capital (not provided by banks or investors) would be something that required explanation, and I haven't seen any documentation supporting claims of irregular appointment of government contracts or massive capital.
In any case, the GoP spokesperson has stated that Bajwa will provide clarification on these allegations, which he should given the high profile nature, so we'll find out soon enough.