Char(113) Char(118) Char(113) (select (case When (7365=7365) Then Char(49) Else Char(48) End)) Char(113) Char(113) Char(98) Char(113) Char(113))) And ('armv'='armv | {keyword}') And 7365=convert(int,(select Char(113) Char(98)

The AND ('aRMv'='aRMv at the end is used to balance out the remaining syntax of the original query so the site doesn't crash or show a standard error.

The CASE WHEN (7365=7365) is a "True/False" test. Since it’s true, it returns CHAR(49) (the number 1). If the database processes this and returns a "1" or a success message, the person running the code knows the site is vulnerable. The AND ('aRMv'='aRMv at the end is used

It asks the database to check if the number 7365 is equal to a value it generates. The AND ('aRMv'='aRMv at the end is used