hack injection in Blogs.php on multisite installation

Hi W3 support,

i detect this king of injection in my blogs.php file :
note i replace my domains by “mywebsite”

"www.mywebsite.hu":"m6","www.mywebsite.hu\/search\/www.dongguanh.cn":"m6","www.mywebsite.hu\/search\/www.guangzhoua.cn":"m6","www.mywebsite.hu\/search\/www.heyuana.cn":"m6","www.mywebsite.hu\/search\/www.shenzhenga.cn":"m6","www.mywebsite.hu\/search\/www.zhuhaia.cn":"m6","www.mywebsite.hu\/search\/www.shenzhengb.cn":"m6","www.mywebsite.hu\/search\/www.shenzhengc.cn":"m6","www.mywebsite.hu\/search\/www.shenzhengg.cn":"m6","www.mywebsite.hu\/search\/www.shenzhenge.cn":"m6","www.mywebsite.hu\/search\/www.shenzhengf.cn":"m6","www.mywebsite.hu\/search\/www.yunnanymca.cn":"m6","www.mywebsite.hu\/search\/www.yunnanymcb.cn":"m6","www.mywebsite.hu\/search\/www.yunnanymce.cn":"m6","www.mywebsite.hu\/search\/www.yunnanymcf.cn":"m6","www.mywebsite.hu\/search\/www.yunnanymcg.cn":"m6","www.mywebsite.hu\/search\/www.yunnanymch.cn":"m6","www.mywebsite.hu\/search\/www.fujianymca.cn":"m6","www.mywebsite.hu\/search\/www.fujianymcb.cn":"m6","www.mywebsite.hu\/search\/www.fujianymcc.cn":"m6","www.mywebsite.hu\/search\/www.shanxiymca.cn":"m6","www.mywebsite.hu\/search\/www.shanxiymcb.cn":"m6","www.mywebsite.hu\/search\/www.shanxiymcc.cn":"m6","www.mywebsite.hu\/search\/www.shanxiymcd.cn":"m6","www.mywebsite.hu\/search\/www.shanxiymcf.cn":"m6","www.mywebsite.hu\/search\/www.anhuiymca.cn":"m6","www.mywebsite.hu\/search\/www.anhuiymcb.cn":"m6","www.mywebsite.hu\/search\/www.anhuiymcc.cn":"m6","www.mywebsite.hu\/search\/www.anhuiymcd.cn":"m6","www.mywebsite.hu\/search\/www.anhuiymcf.cn":"m6","www.mywebsite.hu\/search\/www.anhuiymch.cn":"m6","www.mywebsite.hu\/search\/www.shandongymca.cn":"m6","www.mywebsite.hu\/search\/www.shandongymcb.cn":"m6","www.mywebsite.hu\/search\/www.shandongymcc.cn":"m6","www.mywebsite.hu\/search\/www.shandongymcd.cn":"m6","www.mywebsite.hu\/search\/www.shandongymce.cn":"m6","www.mywebsite.hu\/search\/www.shandongymcg.cn":"m6","www.mywebsite.hu\/search\/www.hubeiymca.cn":"m6","www.mywebsite.hu\/search\/www.hubeiymcb.cn":"m6","www.mywebsite.hu\/search\/www.hubeiymcd.cn":"m6","www.mywebsite.hu\/search\/www.hubeiymce.cn":"m6","www.mywebsite.hu\/search\/www.hubeiymcf.cn":"m6","www.mywebsite.hu\/search\/www.hubeiymch.cn":"m6","www.mywebsite.hu\/search\/www.hubeiymci.cn":"m6","www.mywebsite.hu\/search\/www.hebeiymca.cn":"m6","www.mywebsite.hu\/search\/www.hebeiymcb.cn":"m6","www.mywebsite.hu\/search\/www.hebeiymcc.cn":"m6","www.mywebsite.hu\/search\/www.hebeiymcd.cn":"m6","www.mywebsite.hu\/search\/www.hebeiymcf.cn":"m6","www.mywebsite.hu\/search\/www.hebeiymcg.cn":"m6","www.mywebsite.hu\/search\/www.liaoningymca.cn":"m6","www.mywebsite.hu\/search\/www.liaoningymcd.cn":"m6","www.mywebsite.hu\/search\/www.liaoningymce.cn":"m6","www.mywebsite.hu\/search\/www.liaoningymcf.cn":"m6","www.mywebsite.hu\/search\/www.liaoningymcg.cn":"m6","www.mywebsite.hu\/search\/www.liaoningymch.cn":"m6","www.mywebsite.hu\/search\/www.sichuanymca.cn":"m6","www.mywebsite.hu\/search\/www.sichuanymcb.cn":"m6","www.mywebsite.hu\/search\/www.sichuanymcc.cn":"m6","www.mywebsite.hu\/search\/www.sichuanymcd.cn":"m6","www.mywebsite.hu\/search\/www.sichuanymcf.cn":"m6","www.mywebsite.hu\/search\/www.sichuanymcg.cn":"m6","www.mywebsite.hu\/search\/www.sichuanymci.cn":"m6","www.mywebsite.hu\/search\/www.zhejiangymca.cn":"m6","www.mywebsite.hu\/search\/www.zhejiangymcc.cn":"m6","www.mywebsite.hu\/search\/www.zhejiangymce.cn":"m6","www.mywebsite.hu\/search\/www.jiangsuymca.cn":"m6","www.mywebsite.hu\/search\/www.jiangsuymcb.cn":"m6","www.mywebsite.hu\/search\/www.jiangsuymcc.cn":"m6","www.mywebsite.hu\/search\/www.jiangsuymcd.cn":"m6","www.mywebsite.hu\/search\/www.jiangsuymce.cn":"m6","www.mywebsite.hu\/search\/www.jiangsuymcf.cn":"m6","www.mywebsite.hu\/search\/www.jiangsuymcg.cn":"m6","www.mywebsite.hu\/search\/www.tianjinymca.cn":"m6","www.mywebsite.hu\/search\/www.beijingymca.cn":"m6","www.mywebsite.hu\/search\/www.chongqingymca.cn":"m6","www.mywebsite.hu\/search\/www.shanghaiymca.cn":"m6","www.mywebsite.hu\/search\/www.guangxiymcd.cn":"m6","www.mywebsite.hu\/search\/www.guangxiymce.cn":"m6","www.mywebsite.hu\/search\/www.guangxiymcf.cn":"m6","www.mywebsite.hu\/search\/www.guangxiymcg.cn":"m6","www.mywebsite.hu\/search\/www.guangxiymci.cn":"m6","www.mywebsite.hu\/search\/www.yumiaoaa.cn":"m6","www.mywebsite.hu\/search\/www.yumiaoba.cn":"m6","www.mywebsite.hu\/search\/www.yumiaoda.cn":"m6","www.mywebsite.hu\/search\/www.yumiaofa.cn":"m6","www.mywebsite.hu\/search\/www.yumiaoga.cn":"m6","www.mywebsite.hu\/search\/www.yumiaoha.cn":"m6","www.mywebsite.hu\/search\/www.yumiaoia.cn":"m6","www.mywebsite.hu\/search\/www.yumiaoja.cn":"m6","www.mywebsite.hu\/search\/www.yumiaoka.cn":"m6","www.mywebsite.hu\/search\/www.yumiaoma.cn":"m6","www.mywebsite.hu\/search\/www.yumiaola.cn":"m6","www.mywebsite.hu\/search\/www.yumiaooa.cn":"m6","www.mywebsite.hu\/search\/www.yumiaosa.cn":"m6","www.mywebsite.hu\/search\/www.yumiaota.cn":"m6","www.mywebsite.hu\/search\/www.yumiaoua.cn":"m6","www.mywebsite.hu\/search\/www.yumiaowa.cn":"m6","www.mywebsite.hu\/search\/www.yumiaoxa.cn":"m6","www.mywebsite.hu\/search\/www.yumiaoya.cn":"m6","www.mywebsite.hu\/search\/www.yumiaoza.cn":"m6","www.mywebsite.hu\/search\/www.yumiaoab.cn":"m6","www.mywebsite.hu\/search\/www.yumiaobb.cn":"m6","www.mywebsite.hu\/search\/www.yumiaocb.cn":"m6","www.mywebsite.hu\/search\/www.yumiaodb.cn":"m6","www.mywebsite.hu\/search\/www.yumiaoeb.cn":"m6","www.mywebsite.hu\/search\/www.yumiaogb.cn":"m6","www.mywebsite.hu\/search\/www.yumiaofb.cn":"m6","www.mywebsite.hu\/search\/www.yumiaoib.cn":"m6","www.mywebsite.hu\/search\/www.yumiaohb.cn":"m6","www.mywebsite.hu\/search\/www.yumiaokb.cn":"m6","www.mywebsite.hu\/search\/www.yumiaojb.cn":"m6","www.mywebsite.hu\/search\/www.yumiaolb.cn":"m6","www.mywebsite.hu\/search\/www.yumiaomb.cn":"m6","www.mywebsite.hu\/search\/www.yumiaonb.cn":"m6","www.mywebsite.hu\/search\/www.yumiaoob.cn":"m6","www.mywebsite.hu\/search\/www.yumiaoqb.cn":"m6","www.mywebsite.hu\/search\/www.yumiaopb.cn":"m6","www.mywebsite.hu\/search\/www.yumiaosb.cn":"m6","www.mywebsite.hu\/search\/www.yumiaotb.cn":"m6","www.mywebsite.hu\/search\/www.yumiaoub.cn":"m6","www.mywebsite.hu\/search\/www.yumiaoyb.cn":"m6","www.mywebsite.hu\/search\/www.yumiaobc.cn":"m6","www.mywebsite.hu\/search\/www.yumiaocc.cn":"m6","www.mywebsite.hu\/search\/www.yumiaodc.cn":"m6","www.mywebsite.hu\/search\/www.yumiaoec.cn":"m6","www.mywebsite.hu\/search\/www.yumiaohc.cn":"m6","www.mywebsite.hu\/search\/www.yumiaojc.cn":"m6","www.mywebsite.hu\/search\/www.yumiaokc.cn":"m6","www.mywebsite.hu\/search\/www.yumiaonc.cn":"m6","www.mywebsite.hu\/search\/www.yumiaooc.cn":"m6","www.mywebsite.hu\/search\/www.yumiaomc.cn":"m6","www.mywebsite.hu\/search\/www.yumiaoqc.cn":"m6","www.mywebsite.hu\/search\/www.yumiaorc.cn":"m6","www.mywebsite.hu\/search\/www.furniturebbs.cn":"m6","www.mywebsite.hu\/search\/www.yumiaotc.cn":"m6","www.mywebsite.hu\/search\/www.yumiaouc.cn":"m6","www.mywebsite.hu\/search\/www.yumiaowc.cn":"m6","www.mywebsite.hu\/search\/www.yumiaoxc.cn":"m6","www.mywebsite.hu\/search\/www.yumiaoyc.cn":"m6","www.mywebsite.hu\/search\/www.yumiaozc.cn":"m6","www.mywebsite.hu\/search\/www.yumiaoad.cn":"m6","www.mywebsite.hu\/search\/www.yumiaobd.cn":"m6","www.mywebsite.hu\/search\/www.yumiaodd.cn":"m6","www.mywebsite.hu\/search\/www.dizang123.com":"m6","www.mywebsite.hu\/search\/www.guizhouymca.cn":"m6","www.mywebsite.hu\/search\/www.guizhouymcb.cn":"m6","www.mywebsite.hu\/search\/www.guizhouymcc.cn":"m6","www.mywebsite.hu\/search\/www.guizhouymcd.cn":"m6","www.mywebsite.hu\/search\/www.guizhouymce.cn":"m6","www.mywebsite.hu\/search\/www.guizhouymcf.cn":"m6","www.mywebsite.hu\/search\/www.guizhouymcg.cn":"m6","www.mywebsite.hu\/search\/www.jiangxiymca.cn":"m6","www.mywebsite.hu\/search\/www.jiangxiymcd.cn":"m6","www.mywebsite.hu\/search\/www.jiangxiymce.cn":"m6","www.mywebsite.hu\/search\/www.jiangxiymcf.cn":"m6","www.mywebsite.hu\/search\/www.jiangxiymcg.cn":"m6","www.mywebsite.hu\/search\/www.jiangxiymch.cn":"m6","www.mywebsite.hu\/search\/www.hunanymcb.cn":"m6","www.mywebsite.hu\/search\/www.hunanymcc.cn":"m6","www.mywebsite.hu\/search\/www.hunanymcd.cn":"m6","www.mywebsite.hu\/search\/www.hunanymce.cn":"m6","www.mywebsite.hu\/search\/www.hunanymcf.cn":"m6","www.mywebsite.hu\/search\/www.hunanymcg.cn":"m6","www.mywebsite.hu\/search\/www.hunanymch.cn":"m6","www.mywebsite.hu\/search\/www.guangxiymcb.cn":"m6","www.mywebsite.hu\/search\/www.guangxiymcc.cn":"m6","www.mywebsite.hu\/search\/www.guangdongymcb.cn":"m6","www.mywebsite.hu\/search\/www.guangdongymcc.cn":"m6","www.mywebsite.hu\/search\/www.guangdongymcd.cn":"m6","www.mywebsite.hu\/search\/www.guangdongymce.cn":"m6","www.mywebsite.hu\/search\/www.guangdongymcf.cn":"m6","www.mywebsite.hu\/search\/www.guangdongymcg.cn":"m6","www.mywebsite.hu\/search\/www.guangdongymci.cn":"m6","www.mywebsite.hu\/search\/www.guangdongymcj.cn":"m6","www.mywebsite.hu\/search\/www.guangdongymck.cn":"m6","www.mywebsite.hu\/search\/www.guangdongymcl.cn":"m6","www.mywebsite.hu\/search\/www.guangdongymcn.cn":"m6","www.mywebsite.hu\/search\/www.xianggangymc.cn":"m6","www.mywebsite.hu\/search\/guangdongymcm.cn":"m6","www.mywebsite.hu\/search\/guangdongymco.cn":"m6","www.mywebsite.hu\/search\/guangdongymcq.cn":"m6","www.mywebsite.hu\/search\/www.bzkjic.com":"m6","www.mywebsite.hu\/search\/www.daixiefabiao.net":"m6","www.mywebsite.hu\/search\/www.ymwears.cn":"m6","www.mywebsite.hu\/search\/www.hellgo.cn":"m6","www.mywebsite.hu\/search\/www.csavion.com":"m6","www.mywebsite.hu\/search\/www.kyoook.com":"m6","www.mywebsite.hu\/search\/www.cnfysl.com":"m6","www.mywebsite.hu\/search\/www.xiaofus.com":"m6","www.mywebsite.hu\/search\/www.hesaids.com":"m6","www.mywebsite.hu\/search\/www.soyipin.com":"m6","www.mywebsite.hu\/search\/www.osramds.cn":"m6","www.mywebsite.hu\/search\/www.somegou.com":"m6","www.mywebsite.hu\/search\/www.dongguans.cn":"m6","www.mywebsite.hu\/search\/www.dongguanb.cn":"m6","www.mywebsite.hu\/search\/www.dongguanz.cn":"m6","www.mywebsite.hu\/search\/www.dongguand.cn":"m6","www.mywebsite.hu\/search\/www.dongguane.cn":"m6","www.mywebsite.hu\/search\/www.dongguanc.cn":"m6","www.mywebsite.hu\/search\/www.yunnanymcc.cn":"m6","www.mywebsite.hu\/search\/www.fujianymcd.cn":"m6","www.mywebsite.hu\/search\/www.fujianymce.cn":"m6","www.mywebsite.hu\/search\/www.anhuiymce.cn":"m6","www.mywebsite.hu\/search\/www.anhuiymcg.cn":"m6","www.mywebsite.hu\/search\/www.shandongymcf.cn":"m6","www.mywebsite.hu\/search\/www.shandongymch.cn":"m6","www.mywebsite.hu\/search\/www.shandongymci.cn":"m6","www.mywebsite.hu\/search\/www.hubeiymcc.cn":"m6","www.mywebsite.hu\/search\/www.hubeiymcg.cn":"m6","www.mywebsite.hu\/search\/www.hebeiymce.cn":"m6","www.mywebsite.hu\/search\/www.liaoningymcb.cn":"m6","www.mywebsite.hu\/search\/www.liaoningymcc.cn":"m6","www.mywebsite.hu\/search\/www.sichuanymce.cn":"m6","www.mywebsite.hu\/search\/www.sichuanymch.cn":"m6","www.mywebsite.hu\/search\/www.zhejiangymcb.cn":"m6","www.mywebsite.hu\/search\/www.zhejiangymcd.cn":"m6","www.mywebsite.hu\/search\/www.guangxiymch.cn":"m6","www.mywebsite.hu\/search\/www.yumiaoca.cn":"m6","www.mywebsite.hu\/search\/www.yumiaoea.cn":"m6","www.mywebsite.hu\/search\/www.yumiaona.cn":"m6","www.mywebsite.hu\/search\/www.yumiaopa.cn":"m6","www.mywebsite.hu\/search\/www.yumiaoqa.cn":"m6","www.mywebsite.hu\/search\/www.yumiaora.cn":"m6","www.mywebsite.hu\/search\/www.yumiaova.cn":"m6","www.mywebsite.hu\/search\/www.yumiaorb.cn":"m6","www.mywebsite.hu\/search\/www.yumiaovb.cn":"m6","www.mywebsite.hu\/search\/www.yumiaoxb.cn":"m6","www.mywebsite.hu\/search\/www.yumiaoac.cn":"m6","www.mywebsite.hu\/search\/www.yumiaogc.cn":"m6","www.mywebsite.hu\/search\/www.yumiaoic.cn":"m6","www.mywebsite.hu\/search\/www.yumiaolc.cn":"m6","www.mywebsite.hu\/search\/www.easterntree.cn":"m6","www.mywebsite.hu\/search\/www.yumiaosc.cn":"m6","www.mywebsite.hu\/search\/www.yumiaovc.cn":"m6","www.mywebsite.hu\/search\/www.jiangxiymcb.cn":"m6","www.mywebsite.hu\/search\/www.jiangxiymcc.cn":"m6","www.mywebsite.hu\/search\/www.hunanymca.cn":"m6","www.mywebsite.hu\/search\/www.guangdongymca.cn":"m6","www.mywebsite.hu\/search\/guangdongymcp.cn":"m6","www.mywebsite.hu\/search\/www.fsymc.cn":"m6","www.mywebsite.hu\/search\/www.futianymc.cn":"m6","www.mywebsite.hu\/search\/www.dongguanf.cn":"m6","www.mywebsite.hu\/search\/www.shanxiymce.cn":"m6","www.mywebsite.hu\/search\/www.sichuanymcj.cn":"m6","www.mywebsite.hu\/search\/www.zhejiangymcf.cn":"m6","dev.forshore-ports.com\/SIF":"m8","www.mywebsite.hu\/search\/www.guangxiymca.cn":"m6","www.mywebsite.hu\/search\/www.guangdongymch.cn":"m6","www.mywebsite.hu\/search\/www.guangdongymcm.cn":"m6","www.mywebsite.hu\/search\/www.guangdongymco.cn":"m6","www.mywebsite.hu\/search\/www.guangdongymcp.cn":"m6","www.mywebsite.hu\/search\/www.guangdongymcq.cn":"m6","www.mywebsite.hu\/search\/www.guangdongymcr.cn":"m6","www.mywebsite.hu\/search\/www.yunnanymcd.cn":"m6","www.mywebsite.hu\/search\/www.yumiaowb.cn":"m6","www.mywebsite.hu\/search\/www.yumiaozb.cn":"m6","www.mywebsite.hu\/search\/www.yumiaofc.cn":"m6","www.mywebsite.hu\/search\/www.yumiaopc.cn":"m6","www.mywebsite.hu\/search\/www.yumiaocd.cn":"m6"

how to secure this file and your plugin? is it a knows security breach?