Malicious advertisements served via Yahoo


Detection of the infection

Fox-IT operates the shared Security Operations Center service ProtACT. This service monitors the networks of our clients for malicious activity. On January 3 we detected and investigated the infection of clients after they visited yahoo.com.

Infection

Clients visiting yahoo.com received advertisements served by ads.yahoo.com. Some of the advertisements are malicious. Those malicious advertisements are iframes hosted on the following domains:

  • blistartoncom.org (192.133.137.59), registered on 1 Jan 2014
  • slaptonitkons.net (192.133.137.100), registered on 1 Jan 2014
  • original-filmsonline.com (192.133.137.63)
  • funnyboobsonline.org (192.133.137.247)
  • yagerass.org (192.133.137.56)

Upon visiting the malicious advertisements users get redirected to a “Magnitude” exploit kit via a HTTP redirect to seemingly random subdomains of:

  • boxsdiscussing.net
  • crisisreverse.net
  • limitingbeyond.net
  • and others

All those domains are served from a single IP address: 193.169.245.78. This IP-address appears to be hosted in the Netherlands.

This exploit kit exploits vulnerabilities in Java and installs a host of different malware including:

  • ZeuS
  • Andromeda
  • Dorkbot/Ngrbot
  • Advertisement clicking malware
  • Tinba/Zusy
  • Necurs

The investigation showed that the earliest signs of infection were at December 30, 2013. Other reports suggest it might have started even earlier.

Schematically the exploit looks like this:

yahoo ads malware

Size

Based on a sample of traffic we estimate the number of visits to the malicious site to be around 300k/hr. Given a typical infection rate of 9% this would result in around 27.000 infections every hour. Based on the same sample, the countries most affected by the exploit kit are Romania, Great Britain and France. At this time it’s unclear why those countries are most affected, it is likely due to the configuration of the malicious advertisements on Yahoo.

yahoo ad distribution

Motivation

It is unclear which specific group is behind this attack, but the attackers are clearly financially motivated and seem to offer services to other actors. The exploit kit bears similarities to the one used in the brief infection of php.net in October 2013.

Advice

Block access to the following IP-addresses of the malicious advertisement and the exploit kit:

  • Block the 192.133.137/24 subnet
  • Block the 193.169.245/24 subnet

Also closely inspect network traffic for signs of successful exploits for any of the dropped malware.

Yahoo is aware of the issue and looking into it.

Please watch this page for updates.

Update January 3, 1815 (GMT+1): It appears the traffic to the exploit kit has significantly decreased. It looks like Yahoo is taking steps to fix the problem.

463 thoughts on “Malicious advertisements served via Yahoo

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  4. Upon visiting the malicious advertisements users get redirected to a “Magnitude” exploit kit via a HTTP redirect.. Does this mean that the users will be redirected when they click on the ad or when the ad is displayed? please clarify..

    • Its a drive-by exploit kit, just loading the advertisements was enough to get exploited and infected with malware.

      • There have been reports in other major online publications that the user had to click on the advert to get infected. Please, send out a formal statement on this to my email if possible. We were among the first ones to cover this story and our readers are demanding a confirmation on this!

      • Isn’t it true, correct me if I am wrong, but you MUST have an outdated version of Java installed on the computer in order for the exploit to take place. Then and only then can you be infected by simply visiting the site. I’m not saying I am 100% correct, but I think I am. So if you remove Java, you cannot be exploited, I believe.

      • @Ravi,
        The drive-by did not need to be clicked on. The exploitable version of Java allowed the malware to automatically run. Newer versions of Java required the user to click the advertisement.
        @JimmyFal,
        The older versions of Java allowed the malware to be run automatically. Newer versions required the user to click the ad.

      • @MOCaseA

        Please explain more about which versions of Java are “old” and which are not, how old is old, how many days / weeks / months / years have passed since an “old” java was updated to a new?

        Do you know specifically which versions of java would be old and when a new version came out that it is no longer old?

        When was the break from “old” to new, ?

        1 year ago? 1 month?, what timeframe are we speaking here

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  37. Reblogged this on Southclaw and commented:
    I keep trying to convince my mother to stop using Yahoo mail!
    Getting malware from simply visiting the site is pretty bad.

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  66. “exploits vulnerabilities in Java”. Someone please correct me if I am wrong. Java is hugely exploited on computers. If you have Java on your computer, it must be kept up to date in order to be as protected as possible. However Oracle; the creators of Java see fit to exploit innocent people whom are simply trying to update java regularly, by checking boxes for the end user that routinely change the home page of the browser and install the Ask.com toolbar. A scumbag practice no matter how you slice it. The best way to avoid a java exploit is to go to the control panel on your computer, and REMOVE JAVA. You probably do not need it anyway.

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  122. “it’s unclear why those countries are most affected” – could it be related to the service popularity within those countries? (market share)

    Is there more information about:
    1. the client operating systems and browsers?
    2. the browsers and Java versions affected by the attack?

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  225. Pingback: Un malware diffusé via une publicité sur Yahoo.com | Saamu.Net Blog

  226. Pingback: Malware attacks thousands of Yahoo.com visitors through Java exploit (Update) | VIGALUM

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  229. Pingback: If You Used Yahoo This Week, You Might Have Malware (Updated) | VIGALUM

  230. Pingback: Une publicité malveillante sur Yahoo.comLe blog de NordNet

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  232. Pingback: Malware attacks through Java exploit yahoo.com visitor | Hacker News

  233. Pingback: Yahoo: Schadsoftware infizierte Hunderttausende Nutzer - NETZWELT

  234. Pingback: Schadsoftwareverbreitung auf Yahoo-Seiten

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  236. Pingback: YHOO: Yahoo: Some ads spread malware | finherald

  237. Pingback: News Today Online – Yahoo! website spread malware through adverts

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  239. Pingback: Utilizatorii Yahoo din Europa de Est au fost vizaţi de reclame care conţineau malware (Internet) | like to cum

  240. Pingback: Infected Yahoo Ads Expose Thousands to Malware | Distinct Website Solutions

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  242. Pingback: Malware from Yahoo ads did not affect US and Mac and mobile users | UGBS MOBILE

  243. Pingback: Yahoo : une attaque cause 27 000 infections par heure en Europe | _Tech iTTech iT

  244. Pingback: Yahoo Hacked, 2.5 Million European Users Possibly Infected with Malware - Security Wize

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  249. Pingback: Malware! tainted! ads! infect! thousands! of! Yahoo<i>!</i> users! | htaccess

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  281. Pingback: Yahoo Ad Network Charged With Distributing Malware To Millions Of Users Outside Of US

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  285. Pingback: Yahoo Removes Ads Redirecting to Magnitude Exploit Kit | Threatpost - English - Global - threatpost.com

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  287. What happens, if the Java-Plugin in Firefox is configured, so the user has to specifically confirm the activation of the Plugin, when needed by the Website. My default settings for Firefox are such, that the Runtime needs manual confirmation, while the Java Deployment Toolkit is completely deactivated.
    Is an infaction possible this way?

  288. Pingback: Malware delivered to thousands via ads on Yahoo.com | Magazine

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  291. Pingback: Malware no Yahoo infecta cerca de 27 mil pessoas por hora | Cabrália News - O seu portal de notícias

  292. Pingback: Check your PCs: Yahoo served malware-laced ads over the past week | VentureBeat | Security | by Meghan Kelly

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  309. Pingback: Malware attack hits Yahoo users | Digital News Daily CA

  310. Pingback: Yahoo Ads Used to Spread Exploit Kits | WinProMy Consultancy: IT Support Company in Malaysia Johor Bahru

  311. Pingback: 新年再曝雅虎广告服务器遭受攻击 | 微歌

  312. Pingback: Malware attack hits Yahoo users | News Online Zambia

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  314. Pingback: Yahoo! vittima di un attacco malware | AllTechNewsSources

  315. Pingback: Malware attack hits thousands of Yahoo users per hour | WORLD NEWS

  316. Pingback: The 7th Fire | Thousands of visitors to yahoo.com hit with malware attack

  317. Pingback: Malware delivered to thousands via ads on Yahoo.com | TechLauches - News, tips and reviews from the experts on PCs, Windows, and more

  318. Pingback: Werbung auf Yahoo.com verteilte Malware | ZDNet.de

  319. Pingback: Malware attack hits Yahoo users | ReadNewsFast.com

  320. Pingback: Yahoo Removes Malicious Ads Redirecting to Magnitude Exploit Kit « Cyber Security Aid

  321. Pingback: Firewall Managers - Yahoo! Malware - IT Security Bristol

  322. Pingback: How you could have protected yourself from Yahoo’s recent malware ads - What's Trending?

  323. Pingback: Yahoo! un malware proveniente da alcuni banner pubblicitari infetta più di 300mila computer all’ora | conoscenza informatica

  324. Pingback: Anúncios com malware afetaram 300 mil usuários por hora em sites Yahoo! | Visão Regional - Informação de Qualidade

  325. Pingback: Werbeanzeigen auf Yahoo.com mit Malware verseucht |silicon.de

  326. Pingback: Check your PCs: Yahoo served malware-laced ads over the past week | BaciNews

  327. Pingback: Serwery reklamowe Yahoo niebezpieczne dla internautów z Europy

  328. Pingback: Malware no Yahoo infecta cerca de 27 mil pessoas por hora - Enicomputer, a pagina do Buzum - Tocos do Moji, Sul de Minas, Brasil | Enicomputer, a pagina do Buzum – Tocos do Moji, Sul de Minas, Brasil

  329. Pingback: Everything you need to know about Yahoo’s security breach | One Business

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  333. Pingback: Yahoo Serves Malicious Ads | SecTechno

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  339. Pingback: How you could have protected yourself from Yahoo’s recent malware ads | vpsdash

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  341. Pingback: Yahoo confirma que sus anuncios distribuyeron malware en Europa

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  343. Pingback: Avviso Emsisoft: Yahoo "Malvertisement" infetta 1000 utenti | Emsisoft Blog

  344. Pingback: Warnung, Vorfälle: Yahoo hat nach Hack Schädlinge verbreitet | pc-flüsterer bremen

  345. Pingback: Yahoo confirma que sus anuncios distribuyeron malware en Europa - eju.tv

  346. Pingback: Thousands of Yahoo visitors hit with malware | Plugged Into The Matrix

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  351. Pingback: Yahoo.com victime d’une infection de ses publicités par des malwares |

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  389. Pingback: Propagación del virus por un servidor de Yahoo | [R]eal [R]everse engin[EE]ring

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  414. Pingback: Malware attack hits thousands of Yahoo users per hour – CNN.com | Code Werks Computer Repair

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  421. I wonder why those domains are usually dropped after the botnet is taken down. Someone could reregister them while they’re up for grabs…𝌆!

  422. Pingback: Yahoo Ad Server Hack Compromises Thousands with Java Exploits – Cybersecurity IO

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  425. Pingback: Yahoo Ad Network abused to redirect users to malicious websites serving Magnitude Exploit kit | Satellite-Iptv-Hacking & Security News

  426. Pingback: Yahoo still hasn’t answered questions on how malware hit it sites, users of proxies and VPNs may be affected | Religion Posts

  427. Pingback: Malware served through Yahoo advertisements | Cyber Defense Magazine

  428. Pingback: Un malware diffusé via une Pub sur Yahoo | izitech - Proposé par inwi

  429. Pingback: How you could have protected yourself from Yahoo’s recent malware ads | Vinnica News

  430. Pingback: Yahoo Ad Network abused to redirect users to malicious websites serving Magnitude Exploit Kit | My great WordPress blog

  431. Pingback: Corrupted Yahoo ads infect thousands of users with malware | ITProPortalITProPortal.com

  432. Pingback: Exposed: An inside look at the Magnitude Exploit Kit | Protect Your PC | Tips, Advice, and support. Protect Your PC | Tips, Advice, and support.

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  436. Pingback: How you could have protected yourself from Yahoo’s recent malware ads - progress

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  438. Pingback: Malicious advertisements served via Yahoo | e-Shielder Security

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