Copying Excel data from one sheet to another based upon contents of a cell

Hi, I have a spreadsheet containing two sheets.

Sheet 1 contains the following:

Col A - username
Col B - Full Name
Col C - Email address
Col D - Phone number

Sheet 2 contains the following:

Col A - Active Directory group name
Col B - user name

I require a macro/formula to look at the username in Sheet 2, col B, find it in Sheet 1 Col A, and then copy the contents of Columns B, C and D back to Sheet 2, Columns C, D and E

The end result is that Sheet 2 will be populated with the AD Group Name, Username, Full Name, email addy and phone number.

Hope you can help.

Regards
Dittdott