The below code will send an email alert when someone is added to the SYSADMIN Role on your SQL Server. You can run daily to keep an eye on it. I left some commented code so you can modify it also.
I have not posted any scripts in a long time, Enjoy!
set nocount on
select Convert(varchar(35),@@servername) as 'Server_Name',
Convert(varchar(25),[name])as 'Name',
Convert(varchar(25),loginname)as 'LoginName',
sysadmin,
--hasaccess,
Convert(varchar(25),dbname) as 'Default_Db',
Createdate=Convert(varchar,createdate,100),
[Updatedate]=Convert(varchar,updatedate,100) from master..syslogins
where sysadmin = '1' and updatedate > Getdate()-1 --and sid != 0x01
--WHERE LOGINPROPERTY([name], 'PasswordLastSetTime') > DATEADD(dd, -7, GETDATE());
If @@rowcount = 0
return
else
Begin
Print 'Worked'
Declare @srvname varchar(55),@subject1 varchar(255)
Select @srvname = @@servername
DECLARE @xml NVARCHAR(MAX)
DECLARE @body NVARCHAR(MAX)
SET @xml =CAST(( select name AS 'td','',loginname AS 'td','',sysadmin as 'td','',
dbname AS 'td','',Convert(varchar,createdate,100) AS 'td','',Convert(varchar,updatedate,100) AS 'td'
from master..syslogins
where sysadmin = '1' and updatedate > Getdate()-1 and sid != 0x01
FOR XML PATH('tr'), ELEMENTS ) AS NVARCHAR(MAX))
SET @body ='<html><H1>Changed SQL SA Roles on Server '+ @srvname +'</H1><body bgcolor=white>
<table border="1" style="font-family:Georgia, Garamond, Serif;color:blue;font-style:italic;">
<tr><th>Name</th><th>LoginName</th><th>SysAdminBit</th>
<th>DefaultDb</th><th>CreateDate</th><th>UpdateDate</th>
</tr>' SET @body = @body + @xml +'</table></body></html>'
Set @subject1 = 'Debug Test SQL Sa Role Account Change Report on ' + @srvname
EXEC msdb.dbo.sp_send_dbmail
@recipients =N'someone@emailaddress.com',
@body = @body,@body_format ='HTML',
@subject = @subject1 ,
@profile_name ='Your_Mail__Profile'
End 
We decided to build a quick worker thread alert so we know when we are near the limits.
2019-05-02
1,525 reads
2019-04-26
5 reads
It depends. The mantra of many DBAs and others in IT. Steve Jones reminds us why it applies.
2020-06-23 (first published: 2009-03-25)
548 reads
Encryption in SQL Server is difficult to implement and manage, but it is being required more and more often. However understanding what encryption means is as important as being able to manage and implement it. Michael Coles brings us part 2 in his series on explaining the mysteries behind cryptography.
2005-08-17
11,026 reads
I was talking with the people over at Idera a few weeks ago and they mentioned that their CEO would be happy to give us a few minutes of his time. So I took them up on the offer and built a list of questions about Idera and SQL Server 2005. Take a moment to learn about the vendor view of the world and the impending release of SQL Server 2005.
2005-03-15
6,107 reads