Something evil on 151.248.123.170

151.248.123.170 (Reg.ru, Russia) appears to be active in an injection attack at the moment. In the example I saw, the hacked site has injected code pointing to [donotclick]fdozwnqdb.4mydomain.com/jquery/get.php?ver=jquery.latest.js which then leads to a landing page on [donotclick]db0umfdoap.servegame.com/xlawr/next/requirements_anonymous_ordinary.php (report here but times out) which from the URL looks very much like a BlackHole Exploit kit.

This server hosts a lot of sites using various Dynamic DNS domains. I would recommend blocking the Dynamic DNS domains as a block rather than trying to chase down these bad sites individually. In my experience, Dynamic DNS services are being abuse to such an extent that pre-emptive blocking is probably the safest approach.

These are the domains I can see:
41y7kr.servehttp.com
96ztorwy89.serveblog.net
aehwmcqgx.myddns.com
ahbedbxyo.myfw.us
aivcdizhr.myfw.us
b57idtwn.servehalflife.com
bjtujinsl.changeip.org
bu3l0d4s.serveftp.com
bunahyfba.dns04.com
c9c7gldpp.serveblog.net
cigtdye.changeip.org
cuhadjcnyl.myfw.us
d15txn.servepics.com
db0umfdoap.servegame.com
dzrdmz.youdontcare.com
fapqdfckws.serveusers.com
fdozwnqdb.4mydomain.com
fdqeeo.freeddns.com
fxtloji.serveusers.com
geiuut.itemdb.com
grtyxl.xxuz.com
gxodzugrgq.mypicture.info
hgibkcayvxc.myfw.us
hrxivk.ddns.us
hyjantahjuc.myfw.us
hzfkim.ns01.info
idapjl.port25.biz
igwvypnsne.ftpserver.biz
jghdbtvxgj.ns3.name
jjjpbhx.4pu.com
jziirhsxi.dns04.com
keuiawjhbb.itemdb.com
kptslcbrbg.dsmtp.com
lgjkvp.ddns.us
motxke.dns04.com
mzfpmox.mysecondarydns.com
ngt5lcgnp.3utilities.com
objdjjhjpw.port25.biz
ozcffpa.jetos.com
ppmvfcrlw.youdontcare.com
ptdvlxyn.dsmtp.com
qcoidxrbod.ns02.us
rpsbccts.jetos.com
simiawbsilu.myfw.us
smysfr.ddns.ms
sufgrgzpj.ns3.name
swsdsr.mypicture.info
tbrfrz.lflinkup.net
toqmibzken.dynamicdns.biz
uouxhr.serveusers.com
uv985f.no-ip.info
vnlvrwkat.port25.biz
voc0cjieh.servehttp.com
vvecozzd.ns3.name
w5zik4js.sytes.net
wenrtsjzbc.myfw.us
yupbgt.4pu.com
zenj6u.no-ip.org
zjbihpktdn.myfw.us

This is what I recommend that you block:
151.248.123.170
3utilities.com
4mydomain.com
4pu.com
changeip.org
ddns.ms
ddns.us
dns04.com
dsmtp.com
dynamicdns.biz
freeddns.com
ftpserver.biz
itemdb.com
jetos.com
lflinkup.net
myddns.com
myfw.us
mypicture.info
mysecondarydns.com
no-ip.info
no-ip.org
ns01.info
ns02.us
ns3.name
port25.biz
serveblog.net
serveftp.com
servegame.com
servehalflife.com
servehttp.com
servepics.com
serveusers.com
sytes.net
xxuz.com
youdontcare.com