Wis. Stat. § 811.06
Before the writ of attachment is executed, a bond on the part of the plaintiff in a sum set by the judge or the judicial officer issuing the writ of attachment in an amount sufficient to provide adequate security to the defendant for any damages the defendant may sustain by reason of the attachment, shall be filed with the court to the effect that if the defendant recovers judgment the plaintiff shall pay all damages which the defendant may sustain by reason of the attachment. The affidavit of the surety annexed to the bond shall state that the surety is a resident and householder or freeholder within the state and worth double the sum specified in the bond in property therein above his or her debts and exclusive of property exempt from execution. No bond is necessary when this state or any county, town or municipality therein is plaintiff.
Wis. Stat. § 811.06
The bond may be executed by the plaintiff's attorney on the plaintiff's behalf. Plan Credit Corp. v. Swinging Singles, Inc. 54 Wis. 2d 146, 194 N.W.2d 822 (1972).