A strain of adblocker-aware malvertising is responsible for a range of scams, exploits and general skulduggery.

RoughTed can deliver a variety of payloads including exploit kits and malware. Hackers are leveraging fingerprinting and adblocker-bypassing techniques in a bid to ensure that marks are served content from RoughTed-tainted domains. The various nuisances pushed by the campaign also include adware for Macs, rogue Chrome extensions, tech support scams and surveys.

Traffic comes from thousands of publishers, some ranked in Alexa's top 500 websites. Contaminated domains accumulated over half a billion visits in the past three months alone, according to security firm Malwarebytes.

The threat actors behind RoughTed have been leveraging the Amazon cloud infrastructure, in particular its Content Delivery Network (CDN), while also blending in the noise with multiple ad redirections from several ad exchanges, making it more difficult to identify the source of their malvertising activity.

RoughTed is a large malvertising operation that peaked in March 2017 but began over a year ago and remains at large. It's unusual in that it targets a wide array of users according to their operating system, browser and geolocation before delivering the appropriate payload.

Malwarebytes came across RoughTed while studying the Magnitude exploit kit, as explained in a blog post here. ®