735 ILCS 5/4-127
When it shall appear by the affidavit filed or by the return of the officer, that a defendant in any attachment action is not a resident of this State, or the defendant has departed from this State, or on due inquiry cannot be found, or is concealed within this State, so that the order for attachment cannot be served upon him or her, and that property of the defendant has been attached, or that persons having such property or effects, choses in action or credits belonging to defendant, or owing debts to him or her, have been summoned as garnishees, it shall be the duty of the clerk of the court in which the action is pending to give notice, by publication at least once in each week for 3 weeks successively, in some newspaper published in this State, most convenient to the place where the court is held, of such attachment or garnishment, and at whose action, against whose estate, for what sum, and before what court the same is pending, and that unless the defendant shall appear, give bail, and plead within the time limited for his or her appearance in such case, judgment will be entered, and the estate so attached or garnisheed sold or otherwise disposed of as provided by law. Such clerk shall, within 10 days after the first publication of such notice, send a copy thereof by mail, addressed to such defendant, if the place of residence is stated in such affidavit; and the certificate of the clerk that he or she has sent such notice in pursuance of this section, shall be evidence of that fact.
735 ILCS 5/4-127