{"id":7570,"date":"2015-02-05T10:00:45","date_gmt":"2015-02-05T15:00:45","guid":{"rendered":"http:\/\/blog.nccomputertech.com\/?p=7570"},"modified":"2015-02-05T10:00:45","modified_gmt":"2015-02-05T15:00:45","slug":"malicious-advertisements-on-major-sites-compromised-many-many-pcs","status":"publish","type":"post","link":"https:\/\/nccomputertech.com\/techtalk\/2015\/02\/05\/malicious-advertisements-on-major-sites-compromised-many-many-pcs\/","title":{"rendered":"Malicious advertisements on major sites compromised many, many PCs"},"content":{"rendered":"

\"\"<\/a><\/p>\n

Attackers who have slipped malicious advertisements onto major websites over the last month have potentially compromised large numbers of computers.<\/p>\n

Several security vendors have documented attacks involving malicious advertisements, which automatically redirect victims to other websites or pages that silently attack their computer and install malware.<\/p>\n

\u201cWe certainly see malvertising on the rise,\u201d said Nick Bilogorskiy, head of security research at Cyphort, a security vendor in Santa Clara, California. \u201cWe see it is going to be a major channel of delivering malware this year.\u201d<\/p>\n

For the second time in about a month, Cyphort found malicious advertisements popping up on major websites including the Huffington Post and the LA Weekly between Thursday and Monday. The attack is likely a continuation of the first one, Bilogorskiy said.<\/p>\n

The malvertisements were distributed by Adtech.de, an AOL-owned online advertising company, and two other companies, adxpansion.com and Ad.directrev.com. The bad ads appear to have been removed from Adtech, Bilogorskiy said, who has been in touch with its security team. He couldn\u2019t reach the other two companies.<\/p>\n

The malicious advertisements redirected users through several domains before finally dumping them on pages hosting an exploit kit, an attack tool that scans for software vulnerabilities. It appears this campaign uses the Sweet Orange exploit kit, Bilogorskiy said.<\/p>\n

If a vulnerability is found, malware is automatically delivered, a dangerous type of attack known as a drive-by download. \u201cIt\u2019s the worst case,\u201d Bilogorskiy said.<\/p>\n

The malware installed is called Kovter, which is used to fraudulently generate ad impressions.<\/p>\n

It can be difficult for online advertising companies to keep bad ads out of their systems. The companies \u201care getting millions of ads submitted to them, and any one of them could be malware,\u201d Bilogorskiy said.<\/p>\n

\u201cThey try their best to detect and filter, but it is challenging,\u201d he said.<\/p>\n

Attackers, for example, may enable malicious payloads after their ads have been approved. Other times, they may only attack every 10th user. The ads, Bilogorskiy said, have to be repeatedly checked to ensure they\u2019re not malicious.<\/p>\n

On Tuesday, Cisco\u2019s Talos security research group wrote it had analyzed another large malvertising campaign that uses the Angler exploit kit, a potent one known for its quick employment of the latest Flash vulnerabilities.<\/p>\n

More than 1,800 legitimate domains were being used as part of that campaign, wrote Nick Biasini, a Cisco threat researcher. It appeared the attackers had gained control of the domains\u2019 accounts, many of which were registered through GoDaddy, he wrote.<\/p>\n

The attackers created subdomains on those accounts. People who viewed a malicious ad were redirected to a newly-created subdomain, which then redirected to another subdomain that served up the exploit kit.<\/p>\n

The attackers have created so many subdomains that one may only be used once to redirect, Biasini wrote. Since malicious domains are often quickly detected and blocked by security software, rotating them helps ensure an attack will be successful.<\/p>\n

The Angler attacks kicked off after victims viewed malicious ads, he wrote.<\/p>\n

On Monday, Trend Micro said it discovered a new zero-day in Adobe System\u2019s Flash software after analyzing malvertisement attacks involving Angler. The malvertisement had been seen on the popular website Dailymotion.<\/p>\n

The Flash flaw, CVE-2015-0313, is the third one found in the application in a month. Adobe plans to fix it later this week.<\/p>\n

via Malicious advertisements on major sites compromised many, many PCs | PCWorld<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

Attackers who have slipped malicious advertisements onto major websites over the last month have potentially compromised large numbers of computers. […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[7,10],"tags":[46,375,655],"class_list":["post-7570","post","type-post","status-publish","format-standard","hentry","category-security","category-technology","tag-ads","tag-flash","tag-malware"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/papNkV-1Y6","jetpack-related-posts":[{"id":9930,"url":"https:\/\/nccomputertech.com\/techtalk\/2025\/05\/16\/fbi-says-toss-your-old-router\/","url_meta":{"origin":7570,"position":0},"title":"FBI Says Toss Your Old Router","author":"NCCT","date":"May 16, 2025","format":false,"excerpt":"https:\/\/youtu.be\/scR199zRjvA On Security Now, Steve talks about the FBI's suggestion that we should be tossing out our old routers.","rel":"","context":"In "Security"","block_context":{"text":"Security","link":"https:\/\/nccomputertech.com\/techtalk\/category\/security\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/img.youtube.com\/vi\/scR199zRjvA\/0.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":9655,"url":"https:\/\/nccomputertech.com\/techtalk\/2021\/03\/09\/fuquay-varina-and-holly-springs-computer-repair\/","url_meta":{"origin":7570,"position":1},"title":"Fuquay Varina and Holly Springs Computer Repair","author":"NCCT","date":"March 9, 2021","format":false,"excerpt":"Welcome to our blog. 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