Researchers have tracked down the origins of several increasingly prevalent info-stealers. The attacks have succeeded because crooks spend real money on Google AdWords and evade Google s malvertising screening. Google says it uses proprietary technology and malware detection tools to regularly scan all creatives and that it forbids ads when they try to call fourth parties or sub-syndication to uncertified advertisers. Researchers say the unpacked Redline malware will confuse even the biggest security vendors, using obfuscation techniques.
Source: https://threatpost.com/google-ppc-ads-used-to-deliver-infostealers/166644/