A mysterious hacker group has been taking over ad servers for the past nine months to insert malicious ads that redirect users to malware download sites. Hackers have targeted advertising networks running old versions of the Revive open-source ad servers and silently append malicious code to existing ads. Once the tainted ads load on legitimate sites, the malicious code hijacks and redirects site visitors to websites offering malicious files, usually disguised as Adobe Flash Player updates.
Researchers say the hackers have managed to load its malicious ads on thousands of sites and they spike of up to 1.25 million affected ad impressions in a single day. Allegedly the attacks are still going on as not all advertising companies that have been breached have acted on warnings.
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