Possible, the Russians have deployed BM-30 Smerch
In Syria spotted Russian BM-30 heavy multiple rocket launcher | Defence blog
Reportedly used near Sukayka. "The town is called Sukayka and it is important for maintaining security in the Al-Suwaydaa` Governorate because it is only about 1 km from the Al-Tha’lah Airbase".
However, if so, the target was the Free Syrian Army and Turkmen, not ISIS.
http://www.almasdarnews.com/article/...-in-the-north/