Md. Rule 13-402
Rule 13-402. Objections to Claims
A motion objecting to a proof of claim may be filed at any time before entry of an order approving a receiver's or assignee's final report. The grounds for the motion shall be stated with particularity. The motion shall be served on the claimant, the claimant's counsel of record, if any, and, unless the receiver or assignee is the moving party, on the receiver or assignee.