Malware in Database??

Hello, i have now like 3 months every 4 days aprox i need to clean up my websites (28) or my hosting detect high cpu usage and shut my server down

i do clean my files, change passwords, scan, etc the recommended for this situations, but i can′t find how to scan the DATABASE, i guess there is the problem

is this malicious ??

SELECT * FROM site_asador.wp_posts WHERE (CONVERT(ID USING utf8) LIKE ‘%eval%’ OR CONVERT(post_author USING utf8) LIKE ‘%eval%’ OR CONVERT(post_date USING utf8) LIKE ‘%eval%’ OR CONVERT(post_date_gmt USING utf8) LIKE ‘%eval%’ OR CONVERT(post_content USING utf8) LIKE ‘%eval%’ OR CONVERT(post_title USING utf8) LIKE ‘%eval%’ OR CONVERT(post_excerpt USING utf8) LIKE ‘%eval%’ OR CONVERT(post_status USING utf8) LIKE ‘%eval%’ OR CONVERT(comment_status USING utf8) LIKE ‘%eval%’ OR CONVERT(ping_status USING utf8) LIKE ‘%eval%’ OR CONVERT(post_password USING utf8) LIKE ‘%eval%’ OR CONVERT(post_name USING utf8) LIKE ‘%eval%’ OR CONVERT(to_ping USING utf8) LIKE ‘%eval%’ OR CONVERT(pinged USING utf8) LIKE ‘%eval%’ OR CONVERT(post_modified USING utf8) LIKE ‘%eval%’ OR CONVERT(post_modified_gmt USING utf8) LIKE ‘%eval%’ OR CONVERT(post_content_filtered USING utf8) LIKE ‘%eval%’ OR CONVERT(post_parent USING utf8) LIKE ‘%eval%’ OR CONVERT(guid USIN[…]