vb/forumdisplay.php

($hook = vBulletinHook::fetch_hook('threadbit_display')) ? eval($hook) : false;

                       
                        $Ln = $thread['lastposter'];
                        $Lu = $vbulletin->db->query_first_slave("SELECT usergroupid FROM " . TABLE_PREFIX . "user WHERE username = '".addslashes($Ln)."'");
                        $Li = $Lu['usergroupid'];
                        $Lo = $vbulletin->usergroupcache["$Li"]['opentag'];
                        $Lc = $vbulletin->usergroupcache["$Li"]['closetag'];
                        $thread['lastposter'] = "$Lo $Ln $Lc";
                        $Pn = $thread['postusername'];
                        $Pu = $vbulletin->db->query_first_slave("SELECT usergroupid FROM " . TABLE_PREFIX . "user WHERE username = '".addslashes($Pn)."'");
                        $Pi = $Pu['usergroupid'];
                        $Po = $vbulletin->usergroupcache["$Pi"]['opentag'];
                        $Pc = $vbulletin->usergroupcache["$Pi"]['closetag'];
                        $thread['postusername'] = "$Po $Pn $Pc";

 vb/includes/functions_forumlist.php

$lastpostinfo['lastpostdate'] = vbdate($vbulletin->options['dateformat'], $lastpostinfo['lastpost'], 1);

                        
                                        $Rn = $lastpostinfo['lastposter'];
                                        $Ru = $vbulletin->db->query_first_slave("SELECT usergroupid FROM " . TABLE_PREFIX . "user WHERE username = '".addslashes($Rn)."'");
                                        $Ri = $Ru['usergroupid'];
                                        $Ro = $vbulletin->usergroupcache["$Ri"]['opentag'];
                                        $Rc = $vbulletin->usergroupcache["$Ri"]['closetag'];
                                        $lastpostinfo['lastposter'] = "$Ro $Rn $Rc";