Google Ads delivered tech support scam freezing Windows and Mac devices

Malicious Ads Freeze Devices

Security researchers discovered Google Ads delivering a sophisticated tech support scam. These ads caused the screens of both Windows and Mac devices to freeze, displaying urgent messages that instructed users to contact a fraudulent call center.

Scam Mechanics and Objectives

Upon calling the provided number, victims were pressured to pay significant fees, grant remote access to their computers, or disclose personal information. The scam's technique involved a 'locker' that filled the screen, hid the cursor, disabled exit keys, and lagged the browser, creating the illusion of a broken machine to compel users to call.

Widespread Exposure and Impact

Netskope observed users from 619 customer organizations clicking on these malicious ads between August 31 and September 14, though their systems blocked the content, preventing actual scams. Approximately 62 percent of these organizations were based in the US, with Japan and Australia also significantly affected. Netskope tracked over 250 Google Ads campaign IDs across at least 284 legitimate publisher sites, indicating a broad reach.

Vulnerability of Internet Users

The scam exploits a lack of technical understanding among a significant portion of internet users. Many individuals, unfamiliar with how computers and the internet function, are susceptible to such convincing tactics, especially when under pressure to resolve perceived technical issues quickly.