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.

440 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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  65. “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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  121. “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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  219. Pingback: Malware from Yahoo ads did not affect US and Mac and mobile users – PCWorld | News Station Online

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  221. Pingback: Malware From Yahoo Ads Did Not Affect US and Mac and Mobile Users

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  223. Pingback: Yebaa.com | Malware from Yahoo ads did not affect US and Mac and mobile users

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

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

  226. Pingback: Malware from Yahoo ads did not affect US and Mac and mobile users – PCWorld | Money ChitChat

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

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

  230. Pingback: Malware from Yahoo ads did not affect US and Mac and mobile users – PCWorld | Best Online Market

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

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

  233. Pingback: Schadsoftwareverbreitung auf Yahoo-Seiten

  234. Pingback: Yahoo servers hacked, spreading malware » Cyber Security

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

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

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

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

  240. Pingback: HTTP redirecting attack by uploading the malware in clients via malicious advertisement | My Experiences in Computer Security, Digital Forensics

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

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

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

  244. Pingback: Yahoo users exposed to malware attack | InvoTechno

  245. Pingback: Anuncios cargados de malware se cuelan en Yahoo!

  246. Pingback: Questions left unanswered about Yahoo malware attack – CNET | Custom News Cast

  247. Pingback: Yahoo hat europäische Besucher mit Trojanern angegriffen | Klaus Ahrens: News, Tipps, Tricks und Fotos

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

  249. Pingback: Corrupted Yahoo ads infect thousands of users with malware

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  252. Pingback: FAQ zum Malware-Angriff auf Yahoo-Nutzer: Erste Hilfe für den (möglichen) Ernstfall | BASIC thinking

  253. Pingback: На главной странице Yahoo! нашли вредоносную рекламу | Hacker Info

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  256. Pingback: Uite ce trebuie să faci ca să te ferești de virusul de pe Yahoo Mail | OnlineReport.ro

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  259. Pingback: Yahoo Admits Malicious Ads Spread Malware on its European Sites | Best Laptop Place

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  265. Pingback: Malware strikes thousands of Yahoo users via poisoned adverts |

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  267. Pingback: Anúncios com malware afetaram 300 mil usuários por hora em sites Yahoo!

  268. Pingback: Yahoo display ads used to spread malware | AdTech Times

  269. Pingback: Malware ataca visitantes do Yahoo! na Europa - Midiafeed

  270. Pingback: How you could have protected yourself from Yahoo's recent malware ads | Ghacks

  271. Pingback: FAQ zum Malware-Angriff auf Yahoo-Nutzer: Erste Hilfe für den (möglichen) Ernstfall | Meonik

  272. Pingback: Yahoo Ads Serve Up Malware… Yikes! | The IT Nerd

  273. Pingback: Un malware diffusé via une publicité sur Yahoo.com | Le refuge informatique

  274. Pingback: IT Security Guru Yahoo beats down malvertising worry | IT Security Guru

  275. Pingback: Yahoo's Ad Network May Have Infected Your Computer With Malware - TechReact - We Solve Computer Problems RIGHT NOW! Call Today (201) 305-3303

  276. Pingback: Yahoo ha sido hackeado; 2,5 millones de usuarios europeos infectados con malware | Hackerss

  277. Pingback: Yahoo Ad Sever Suffers Malware Attack

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  279. Pingback: Yahoo Ads Spread Malware To Users, Company Confirms – News Provide

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

  281. Pingback: If You Used Yahoo This Week, You Might Have Malware | Rob's Personal Aggregator

  282. Pingback: Yahoo claims malicious ads under control | News Feed

  283. Pingback: Malware from Yahoo ads did not affect US and Mac and mobile users | PWRNEWS

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

  285. Pingback: Yahoo users exposed to malware attack | Bountolos.info

  286. 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?

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

  288. Pingback: ‘Malware Attack Hits Thousands Of Visitors To Yahoo.com’ – Business Insider | My Business Online

  289. Pingback: Malware attacks thousands of Yahoo.com visitors through Java exploit (Update) - GeekCafé

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

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

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  293. Pingback: Malware no Yahoo infecta cerca de 27 mil pessoas por hora - 2° Geração - Portal de Notícias

  294. Pingback: Check your PCs: Yahoo served malware-laced ads over the past week | My Website

  295. Pingback: Yahoo : Une cyberattaque cause 27 000 infections par heure en Europe | UnderNews

  296. Pingback: – root@injetionsec:~# » Yahoo com anúncios de propagação de malware

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  299. Pingback: Yahoo Users Face Malware Attack

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  301. Pingback: Yahoo Users Infected with Malware After Ads Hijacked

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

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

  310. Pingback: 新年再曝雅虎广告服务器遭受攻击 | 微歌

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

  312. Pingback: hackerangriff: werbung auf yahoo-seiten verbreitete schadsoftware » Computer Wissen Information

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

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

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

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

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

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

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

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

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

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

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

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

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

  327. 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

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

  329. Pingback: Folding Corners » How To Prevent Yahoo! Malware Attacks

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  332. Pingback: Yahoo Serves Malicious Ads | SecTechno

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  337. Pingback: Anúncio malicioso com vírus infecta milhares de usuários do Yahoo – Blog Qart Tecnologia

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

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

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

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

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

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

  346. Pingback: Malicious Ads Delivered To European Yahoo Users – India Business

  347. Pingback: Yahoo “Malvertisements” infizieren Tausende Nutzer | Emsisoft Blog

  348. Pingback: Yahoo: Manipulierte Werbe-Banner verbreiten Viren » Computer Wissen Information

  349. Pingback: Malware no Yahoo infecta cerca de 27 mil pessoas por hora | carlosmaster.com

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

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  353. Pingback: Up to 2m PCs infected via Yahoo ads – Technology news, comment and analysis | theguardian.com | Internet Technology Business

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  357. Pingback: Yahoo confirma que sus anuncios distribuyeron malware en Europa - Master Tech | Master Tech

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  366. Pingback: Emsisoft Malware Warning: Yahoo “Malvertisements” Infect 1000s of Users - AhelioTech

  367. Pingback: Anúncio malicioso com vírus infecta milhares de usuários do Yahoo

  368. Pingback: Confirmed: Yahoo Ads Were Spreading Malware To Users | | SecurityProNews

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  370. Pingback: Yahoo malware turned European computers into bitcoin slaves | Digital News Daily CA

  371. Pingback: Yahoo besmet mogelijk miljoenen computers met Bitcoin-botnet | Coincourant

  372. Pingback: Europeans users of Yahoo have PCs turned into Bitcoin miners | News Feed

  373. Pingback: If you've been on Yahoo lately, you might want to take some security precautions | TechTrends

  374. Pingback: Yahoo "Malvertisements" Infect 1000s of Users | Emsisoft... | Emsisoft Blog

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  376. Pingback: Yahoo malvertising attack | AMAZING SECRETS OF HACKING

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  378. Pingback: Evropští uživatelé nakaženi malwarem po návštěvě serverů Yahoo » Kyber bezpečnost

  379. Pingback: Yahoo Malvertising Attack Linked to Larger Malware Scheme

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  382. Pingback: Yahoo publica anuncios con malware

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  386. Pingback: Yahoo malvertising attack linked to larger malware scheme | TechLauches - News, tips and reviews from the experts on PCs, Windows, and more

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

  389. Pingback: Yahoo Attacks “Linked to Larger Cyber Scheme” – Facts Update | RemoveYourMalware

  390. Pingback: Buka Situs Yahoo Dikatakan Bisa Terjangkit Malware | My Blog

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  394. Pingback: Yahoo: Malware-Angriff via Werbung war umfassender als gedacht | ZDNet.de

  395. Pingback: M&G readers targeted by scam gang | BriPay News Aggregator

  396. Pingback: Les « malvertisements » de Yahoo infectent des milliers d’utilisateurs | Emsisoft Blog

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  403. Pingback: Malware delivered to thousands via ads on Yahoo.com - The Headlines Now - Live News India, World, Business, Technology, Sports, Fashion, LifeStyle & Entertainment

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  407. Pingback: Reputazione a rischio per Yahoo: è più importante la qualità dei servizi o la popolarità dei suoi spokesman? | Behind Reputation

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

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

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  416. Pingback: Questions left unanswered about Yahoo malware attack - Talk Tech

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  419. Pingback: Yahoo Malware, additional data based on Fox-IT report | iSEC Source

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

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

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