I don't think that is a mod so much as a template edit...
In your Admin CP go to Style Manager -> Your Style(s) -> All Style Options
Edit your footer box...
Find the code:
<div align="center">
<div class="smallfont" align="center">
<!-- Do not remove this copyright notice -->
$vbphrase[powered_by_vbulletin]
<!-- Do not remove this copyright notice -->
</div>
<div class="smallfont" align="center">
<!-- Do not remove $cronimage or your scheduled tasks will cease to function -->
$cronimage
<!-- Do not remove $cronimage or your scheduled tasks will cease to function -->
$vboptions[copyrighttext]
</div>
</div>
Replace it with this:
<div align="center">
<table cellpadding="$stylevar[cellpadding]" cellspacing="0" border="0" width="$stylevar[outertablewidth]">
<tr><td align="left">
<div class="smallfont" align="left">
<!-- Do not remove this copyright notice -->
$vbphrase[powered_by_vbulletin]
<!-- Do not remove this copyright notice -->
</div>
<div class="smallfont" align="left">
<!-- Do not remove cronimage or your scheduled tasks will cease to function -->
$cronimage
<!-- Do not remove cronimage or your scheduled tasks will cease to function -->
$vboptions[copyrighttext]
</div>
</td><td align="right">
Your custom <br />
Content here <br />
</td></tr>
</table>
</div>
That should give you a footer like here with copyright text on the far left and your custom content on the far right.