The pro-government al-Masdar news service said that air defenses fired several missiles to fend off an attack near the el-Kisweh region and that it was not clear if the Syrian missiles were fired at an aircraft, drone or incoming rockets.
Asked whether Israel should be less wary of possible flare-ups on the Golan - much of which it seized from Syria in a 1967 war and annexed in a move not recognised overseas - Lieberman said: "I believe so".
Israel has increasingly sought Russia's involvement in securing its frontier with Syria and in scaling back Iran's influence in the area. Israel has also upped its strikes against suspected Iranian targets inside Syria.
During their summit in Helsinki, Russian President Vladimir Putin and President Donald Trump said they were exploring ways to protect Israel from the war in Syria. "We will not let Iran use Syria as a base to attack us from".
He declined to say specifically where they were located, but said it was in the southern Golan, near the Jordanian border.
The group is made up of about 300 fighters and is the only one remaining in the Syrian Golan Heights that has not yet surrendered to Syrian President Bashar Assad's army, which has recovered most of the Golan Heights along the Israeli border. An initial assessment by Israel's military identified the gunmen as Islamic State militants, in what would mark a rare attempt by the Islamist militants to infiltrate Israel.
"From our perspective, the situation is returning to how it was before the civil war, meaning there is a real address, someone responsible and central rule", Lieberman told reporters during a tour of air defence units in northern Israel.
Assad told his troops on Wednesday they were close to victory after inflicting a succession of defeats on fighters.
He said Israel will not accept any changes to the 1974 deal or the presence of any Syrian troops or allied militias inside the disengagement zone.
Jordan has been in discussions with Russian authorities, Safadi said, and will respond to Syria's request "positively" in a way that supports Jordanian and Syrian interests.