Anaheim confirmed the agreement on its official site.
The Hawks acquired Garbutt from the Dallas Stars in July as part of the Patrick Sharp trade. The 30-year-old left winger scored just six points and racked up a minus-seven rating in 43 games with the team before being dealt again.
He'd made a bigger offensive impact over the previous two seasons in Dallas, tallying 25 goals and 32 assists across 142 contests.
The Ducks will hope he's able to rediscover at least some of that scoring touch. They struggled mightily to find the net during the first half of the campaign and currently rank at the bottom of the league in goals per game (1.98).
Meanwhile, Chicago gets a younger asset in Sekac, 23, who's still trying to find his way in the NHL. He had just three points in 22 games for Anaheim this season. His shooting percentage (3.4 percent) does suggest he should be in line for a little more "puck luck" over time, though.
It's a trade that makes sense for both sides, especially with both players needing a spark after failing to make their presence felt so far this season.
The Ducks get a player more prepared to help them right away, and Garbutt's numbers should improve if he's placed in a more offensive role. On the flip side, the West-leading Hawks couldn't find a consistent place for the veteran and can take a chance on Sekac without needing much from him in the short term.