Internet and mobile phone users are being warned about scam messages claiming to be Woolworths supermarket offering cash for completing a survey.

Consumer Protection says a number of WA residents received fake emails, Facebook messages and text messages this week, asking them to answer five questions about the supermarket to claim $50 cash.

It asks customers to rate the store's performance, then asks for the recipient's name, address, driver's licence number, Medicare number and bank account details.

Consumer Protection's David Hillyard says the scam is highly convincing.

"They've replicated everything to make it look legitimate," he said.

"They are not littered with spelling mistakes that we might normally see in things which have been put together by people from overseas, so it looks quite professional."

Mr Hillyard says people can do a quick background check online if they suspect something is a scam.

"Do a bit of research, check on the company's website to see if they are promoting this sort of competition or asking people to complete these sorts of surveys," he said.

"If you had gone to the Woolworths websites, you would then find that there are warnings on that site, telling you not to get engaged in this and that it is a scam."