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Terry Myerson said Strontium was exploiting the bug to infect PCs in order to get access to potentially sensitive data.
Strontium is also known as APT28 and Fancy Bear, and has previously been blamed for attacking a French TV network and the US Democratic Party.
Microsoft says it is working on a fix.
It intends to release the patch next week.
Other cybersecurity researchers say analysis of the hackers' previous activities suggests they are Russians, or at least citizens of a neighbouring country who can speak Russian, and appear to be acting in Moscow's interests rather than for personal profit.
FireEye - a company whose clients include the US Department of Defense - has gone so far as to say the attackers are "most likely sponsored by the Russian government".
But the link has never been conclusively proven, and the Kremlin has repeatedly denied its involvement.
It's unusual for the big tech companies to reveal a software flaw in their products before they have a fix, because it flags the problem to cybercriminals.
Indeed, Microsoft had planned to stay quiet about this bug until it had a solution.
But Google forced its hand when it published details of the issue on Monday.
Microsoft was irked. But Google justified its move saying: "This vulnerability is particularly serious because we know it is being actively exploited."
Mr Myerson has confirmed the issue is with a system file, which Windows requires to display graphics.
The company says customers using both the latest version of Windows 10 and Microsoft's own Edge web browser should be safe but acknowledges others remain at risk.
However, it says the attack only works if a user also has Flash installed, and a newly released version of Adobe's media plug-in also provides protection.
Regarding Strontium itself, Microsoft says the hackers have come up with more types of novel attack - known as zero-days - than any other tracked group this year.
"Strontium frequently uses compromised email accounts from one victim to send malicious emails to a second victim and will persistently pursue specific targets for months until they are successful in compromising the victims' computers," Mr Myerson wrote.
"Once inside, Strontium moves laterally throughout the victim network, entrenches itself as deeply as possible to guarantee persistent access, and steals sensitive information."
The hackers are believed to have used spearphishing - a technique that involves targeting specific individuals with emails and other messages that seek to fool them into revealing their logins.
The attackers have a reputation for being persistent.
They have been known to repeatedly send messages to high-value individuals for more than a year, if necessary, until one succeeds.
Neither Google nor Microsoft have said who received the latest batch of booby-trapped emails.
But Microsoft has previously said of the hackers' typical prey: "Its primary institutional targets have included government bodies, diplomatic institutions, and military forces and installations in Nato member states and certain Eastern European countries.
"Additional targets have included journalists, political advisers, and organisations associated with political activism in Central Asia."
The group has also been called Sofacy, Sednit and Pawn Storm, and has been linked to attacks dating back to 2007.
It appears to operate its own website, where it calls itself Fancy Bears.
It was used to leak confidential medical files about US Olympic athletes earlier this year, which had been stolen from the World Anti-Doping Agency.
The site suggests the group is part of the wider Anonymous hacktivist collective, although this may be an attempt at misdirection.
Months earlier, cybersecurity company Crowdstrike accused the hackers of breaching the US Democratic Party's governing body's network.
It suggested they might be affiliated with the GRU, Russia's military intelligence service.
"Their tradecraft is superb, operational security second to none, and the extensive usage of 'living-off-the-land' techniques enables them to easily bypass many security solutions they encounter," it said in a report.
Other activities blamed on the team include:
No. Security company Trend Micro has previously linked the hackers to malware designed to infect jailbroken iPhones and iPads.
Microsoft says it has also observed the group using web domains customised to compromise Mac and Linux computers in other campaigns.
In the past, Kremlin spokesman Dmitry Peskov has strenuously denied allegations that the hackers are directed or supported by the Russian government or its intelligence services.
He has said the claims are "unfounded" and "do not contain anything tangible".
"There's no smoking gun," says Alan Woodward, a security consultant who advises Europol and has worked with GCHQ in the past.
"But the amount of circumstantial evidence is certainly mounting.
"What most of the government agencies are saying is that the Russian government doesn't seem to be doing anything to stop them, which kind of tells a story in itself."
Microsoft's Windows chief has accused a notorious group of hackers - previously linked to Russia - of making use of an unpatched flaw in its operating system.

It has certainly got him noticed, something which used to be a problem for the Liberal Democrats. He finds himself trending on twitter, along with a cheeky remix of the party political broadcast.
Although Mr Clegg has previously said that Liberal Democrats have nothing to apologise for, last year he did tell the leader of the Welsh Liberal Democrats: "I know I haven't always made your life easy, Kirsty, sorry about that."
In the same speech, Mr Clegg highlighted the possibility of St David's Day becoming a bank holiday in Wales.
The idea was launched in a UK government tourism strategy, which promised to consult the Welsh assembly on whether it should have the power to move the spring bank holiday from early May to March 1.
It was potentially good news for those parties which have campaigned for a St David's Day holiday, although David Jones, since promoted to David Cameron's cabinet, told MPs that it could have cross-border implications: "For that reason it is a matter that properly resides with this parliament".
So, eighteen months on, what's occurin'? Not much, by the look of it. The idea appears to have been quietly dropped.
I contacted the department for culture, media and sport to find out the latest state of play and was directed to a blog written some months ago by its former tourism minister.
John Penrose, for it was he, said: "We tested the water in a pretty general way, making it crystal clear that if there was no particular consensus - or a general feeling that the status quo was just fine, thank you very much - then that was what we'd go for."
Mr Penrose summed up the results of the "pre-consultation" like this:
"So no consensus. And - roll-of-drums - no change of bank holiday dates. And is this a victory for Merrie Englande lobbyists and a set-back for hoteliers; or is it a triumph for lawn-mower sellers and a defeat for punch-and-judy men? None of the above, really. More a case of doing what we said we'd do. Will there be headlines along the lines of MINISTER IN 'DOING WHAT PUBLIC WANT' SHOCKER? I rather doubt it."
Indeed, there were very few headlines at all. Mr Penrose was sacked in the reshuffle earlier this month but according to the DCMS when it comes to bank holidays the status quo remains.
Will Nick Clegg use his party conference to update voters on the policy or could there be another "sorry" on the way?
Nick Clegg hopes his apology for that pledge on university tuition fees will help ensure the Liberal Democrats' work in government is not overshadowed by the breakdown in trust over broken promises.

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He highlighted Chelsea's John Terry and Real Madrid's Sergio Ramos as the type of character he would like to bring in to the Premier League strugglers.
Clement admits that those sorts of players are hard to find.
He would also not be drawn on speculation linking them with a move for Everton defender Phil Jagielka.
Former captain Ashley Williams was sold to Everton in the summer and the Swans have struggled in defence since.
Former Sheffield United skipper Jagielka has played only twice since the Toffees' defeat at Southampton in November with Williams and Ramiro Funes Mori preferred in the centre of defence.
Alfie Mawson, 22, joined Swans from Barnsley at the end of August and has been part of a defence that has conceded 49 league goals.
That is the highest number conceded by a top-flight team this season and Swansea are bottom of the table as they travel to face Liverpool on Saturday.
"That is an important area," said Clement. "To have someone that's got presence, leadership qualities both from a psychological point from a view and from an organisational point of view.
"But you could say the same that that's important in a goalkeeper, that's important in a central midfield player and you'd like to think that you'd have 11 leaders out there, but you don't."
Clement highlighted Terry and Ramos at the type of player he admires along with Manchester United's Zlatan Ibrahimovic.
"It's becoming more rare in football as well that you have these characters like a John Terry for example, a Sergio Ramos," said Clement.
"I've worked at lots of big clubs, they're the two stand-out ones for me. Zlatan is another example.
"They're not easy to find these kind of players that have this confidence and ability to not only do their own job, but help others around them as well.
"There's a big demand on a player like that."
Clement expects his January recruitment to continue right up to the 31 January deadline day when they play Southampton at Liberty Stadium.
But he refused to be drawn on speculation linking them with a move for Everton defender Phil Jagielka.
Swansea's relegation rivals Sunderland have also been linked with Jagielka might leave.
When asked of Jagielka might leave, Everton boss Ronald Koeman said: "I don't know.
"It's all about if there is interest for Jag.
"Of course the last few weeks he did not start but he is important, he is the captain of the team.
"He is not happy because he is not starting and that's a good signal.
"What you need to do as a player is fight and make it difficult for the manager."

Swansea City boss Paul Clement wants to sign a player with "presence and leadership" qualities before the end of the January transfer window.

