Bank of Ireland is warning consumers to be especially vigilant for fraud as the Black Friday and Cyber Monday online shopping days near.
Bank of Ireland noted that its customers spent 54% more online during Black Friday last year compared to a standard Friday, with clothing sales up 104% and electrical goods sales increasing by 100%.
The bank cautioned that fraudsters will be stepping up their activity on these key shopping days.
Bank of Ireland is warning consumers to be careful with links in emails and texts, adding that links can lead to fake websites where consumers may be asked to share personal banking details, including activation codes.
Consumers are also advised not to share their banking details, including their full online banking PIN, or other personal information.
The bank also wants consumers to make sure they double check website addresses for anything unusual and say they should always use trusted websites.
It advises consumers to check that the "https" and the lock symbol is displayed on a website and also says people should be careful with Pop ups on their social media feeds.
The bank also urges consumers to use up to date anti-virus software on their computer, which will help protect it against malware.
Nicola Sadlier, Head of Fraud at Bank of Ireland said that shoppers need to be extra vigilant for fraud on Black Friday and Cyber Monday.
"Fraudsters like to inject an element of urgency into their offers or fake adverts, but don't rush a transaction without checking things properly first," Ms Sadlier said.
"Verify if websites and apps are legitimate and be extremely careful with online adverts, texts or e-mails. Remember, if something sounds too good to be true, it's probably fraud," she added.
