Health insurer Medibank could be facing legal action after the personal details of millions of its customers were stolen in a data breach.

After the health information of some of its customers were posted on the dark web, law firm Maurice Blackburn confirmed it was reviewing whether customers affected by the hack could be entitled to compensation.

The firm's principal lawyer Andrew Watson said the breach of data was one of the most serious seen in Australia.

"Companies that hold their customers' sensitive health information have an important obligation to make sure that information is safeguarded, commensurate with the sensitivity of that data," he said.

"Medibank have a heightened responsibility ti out in place greater safeguards to secure the personal and health claim information it collected from its customers."

Data including names, phones numbers, Medicare numbers and sensitive health information was taken by the hackers during the breach.

As the government looks for solutions to improve cyber security laws, Home Affairs Minister Clare O'Neil has flagged it could soon be illegal for companies to pay ransom demands to hackers should they be subject to a data breach.

"The way we're thinking about the reform task ... is a bunch of quick wins, things that we can do fast, and the standing up for the new police operation is one of those," Ms O'Neil told the ABC's Insiders on Sunday.

"There's some really big policy questions that we're going to need to think about and consult on, and we're going to do that in the context of the cyber security strategy."

Federal police confirmed last week Russian hackers were behind the attack.

A 100 officer-strong, standing cybercrime operation targeting hackers will be led by the AFP and Australian Signals Directorate.

"We are not going to sit back while our citizens are treated this way and allow there to be no consequences for that," Ms O'Neil said.

"We are offensively going to find these people, hunt them down and debilitate them before they can attack our country."

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England have stamped themselves cricket's white-ball kings after withstanding Pakistan's fearsome pace attack to win the T20 World Cup final by five wickets at the MCG.

Star allrounder Ben Stokes once again proved himself the ultimate big-game player, steering England home with six balls to spare in the face of Pakistan's fast-bowling brilliance.

Stokes hit the winning run to finish unbeaten on 52 and ensure England claimed their second T20 World Cup title and first since 2010.

They are the first team to hold the ODI and T20 World Cups at the same time after their memorable win over New Zealand in the 2019 50-over final at Lord's.

Predicted rain failed to arrive and interrupt Sunday night's blockbuster decider as 80,462 fans turned out for a rematch of the 1992 ODI World Cup final at the same venue.

England were in the box-seat after captain Jos Buttler won the toss and elected to field first, restricting Pakistan to just 8-137.

An explosive spell from tearaway quick Haris Rauf threatened to put Pakistan back in the contest as he dismissed No.3 Phil Salt and Buttler (26) in quick succession during England's chase to have the MCG rocking.

Shaheen Afridi took a superb catch to dismiss Harry Brook (20) and have England reeling at 4-84 but the star Pakistani quick hurt himself in the process and was unable to bowl his crucial remaining two overs.

Momentum swung back towards England when Afridi went off the field, as Stokes played the starring role just like he did in the ODI final three years ago.

Moeen Ali (19) played a vital cameo role with Stokes but was bowled within five runs of victory.

"I think in finals, especially chasing, if you do all the hard work before with the ball ... that's what won us the game," Stokes told the host broadcaster.

"That was a tricky wicket, one that you felt like you were never really in on. There was a bit of bounce.

"To restrict them to 137, the bowlers have to take a lot of credit for that

"Representing your country in world cups is amazing. This has been a good one."

Earlier, left-arm seamer Sam Curran put in a crucial spell of 3-12 from his four overs, an effort which led to him being named player of the match and the tournament.

The miserly Curran was able to remove the composed Shan Masood, forcing the middle-order batter into a rash shot when caught on the boundary for 38.

The 24-year-old also claimed Mohammad Rizwan (15), bowling the explosive opener for England's first wicket of the match.

Legspinner Adil Rashid was equally influential, finishing with 2-22 including the vital wicket of Mohammad Haris with his first ball.

Rashid's next scalp was even more important, as he dismissed dangerous Pakistan captain Babar Azam (32) during an over that turned out to be a wicket-maiden.

Stokes endured a nervous start with the new ball, sending down a no-ball and a wide with the first two deliveries of the game.

But it was all England after that, silencing the pro-Pakistan crowd by taking regular wickets and limiting their ability to find the boundary.

England and Pakistan both took unchanged teams into the decider after peaking at the right end of the tournament.

Key England fast bowler Mark Wood (hip) and batter Dawid Malan (groin) were again left out after struggling with injury.

Despite a forecast of heavy showers and possible storms, rain did not disrupt the match.

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Twenty20 World Cup organisers remain on edge as predicted heavy rain threatens to disrupt the tournament's final at the MCG between Pakistan and England.

Despite a forecast of heavy showers and possible storms, rain has so far stayed away from Melbourne on Sunday ahead of the match, scheduled to begin at 7pm AEDT.

Rain has hit large parts of northern Victoria but nothing has fallen around the MCG and both teams have been able to warm-up out on the ground.

With the toss scheduled for around 6.30pm, a crowd of more than 80,000 is expected to attend the first men's T20 World Cup final in Australia.

Up to 20mm of rain and a possible storm was expected for Melbourne on Sunday, with the Bureau of Meteorology forecasting a 100 per cent chance of showers.

To constitute a match, a minimum of 10 overs per team is required, unlike the group stage when only five overs per-side was needed to complete a game.

If the final is washed out, world governing body the ICC has left Monday as a reserve day with play beginning at 3pm.

But inclement weather was also forecast for Melbourne on Monday, with a 95 per cent chance of showers and up to 10mm of rain predicted.

If play starts on Sunday and is later stopped, the game will resume on Monday from where it left off.

In the event rain washes out any prospect of play the competing teams will be forced to share the T20 trophy in what would be a first for an ICC tournament.

It comes after three games at the MCG during the group stage were abandoned due to wet weather.

Another match, also involving England, was shortened because of rain as Ireland upset their highly fancied opponents.

England captain Jos Buttler said that shock loss was a turning point for his team's tournament.

"The weather around Melbourne was dominating the whole tournament at that stage and was definitely a distraction at times," he told reporters on Saturday.

"We've seen a reaction to that game in the rest of the cricket we've played."

England are trying to become the first team to hold the ODI and T20 World Cups at the same time after their memorable win in the 2019 50-over final at Lord's.

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England have elected to field first in the blockbuster T20 World Cup final against Pakistan as predicted heavy rain continues to stay away from the MCG.

In a rematch of the famous 1992 ODI World Cup final at the same venue, England captain Jos Buttler had no hesitation in sending Pakistan in to bat after winning the toss.

Play is due to get underway at 7pm AEDT in front of more than 80,000 fans.

"Huge game, good nerves, good energy around the team and in the stadium," Buttler said.

"Both teams in red-hot form, looks a good wicket, a bit of weather around which is why we bowled first."

England will take an unchanged team into the decider after smashing India by 10 wickets in Thursday night's semi-final at the Adelaide Oval.

Key fast bowler Mark Wood (hip) and important batter Dawid Malan (groin) will miss out after struggling with injury.

Despite a forecast of heavy showers and possible storms, rain has so far stayed away from Melbourne on Sunday.

Rain has hit large parts of northern Victoria but nothing has fallen around the MCG and both teams have been able to warm-up out on the ground.

Up to 20mm of rain and a possible storm was expected for Melbourne on Sunday, with the Bureau of Meteorology forecasting a 100 per cent chance of showers.

To constitute a match, a minimum of 10 overs per team is required, unlike the group stage when only five overs per-side was needed to complete a game.

If the final is washed out, world governing body the ICC has left Monday as a reserve day with play beginning at 3pm.

But inclement weather was also forecast for Melbourne on Monday, with a 95 per cent chance of showers and up to 10mm of rain predicted.

If play starts on Sunday and is later stopped, the game will resume on Monday from where it left off.

In the event rain washes out any prospect of play the competing teams will be forced to share the T20 trophy in what would be a first for an ICC tournament.

It comes after three games at the MCG during the group stage were abandoned due to wet weather.

Another match, also involving England, was shortened because of rain as Ireland upset their highly fancied opponents.

England are trying to become the first team to hold the ODI and T20 World Cups at the same time after their memorable win in the 2019 50-over final at Lord's.

T20 WORLD CUP FINAL TEAMS

ENGLAND: Jos Buttler (capt), Alex Hales, Phil Salt, Ben Stokes, Harry Brook, Moeen Ali, Liam Livingstone, Sam Curran, Chris Woakes, Chris Jordan, Adil Rashid.

PAKISTAN: , Babar Azam (capt), Muhammad Rizwan, Mohammad Haris, Shan Masood, Iftikhar Ahmed, Shadab Khan, Mohammad Nawaz, Mohammad Wasim, Shaheen Shah Afridi, Haris Rauf, Naseem Shah

© AAP 2022