This critter appears in my log sometimes:
113.161.88.70 - - [24/Aug/2014:00:29:49 -0700] "GET
/?C=D;O=A'+union+select+char(38,126,33),char(38,126,33),char(38,126,33),char(38,126,33),char(38,126,33),char(38,126,33),char(38,126,33),char(38,126,33),char(38,126,33),char(38,126,33),char(38,126,33),char(38,126,33),char(38,126,33),char(38,126,33),char(38,126,33),char(38,126,33),char(38,126,33),char(38,126,33),char(38,126,33),char(38,126,33),char(38,126,33),char(38,126,33),char(38,126,33),char(38,126,33),char(38,126,33),char(38,126,33),char(38,126,33),char(38,126,33),char(38,126,33),char(38,126,33)+--+
HTTP/1.1" 200 5630
Apache apparently understands it (and returns 200 5630). I didn't
find "char(" in RFC2616 nor a Google Search of the Apache
documentation <http://httpd.apache.org/docs/2.2/>.
Any idea what it is?
--Gil