Sextortion-based hacking, which hijacks a victim’s webcam or blackmails them with nudes they’re tricked or coerced into sharing, has long represented one of the most disturbing forms of cybercrime. Now one specimen of widely available spyware has turned that relatively manual crime into an automated feature, detecting when the user is browsing pornography on their PC, screenshotting it, and taking a candid photo of the victim through their webcam.
On Wednesday, researchers at security firm Proofpoint published their analysisof an open-source variant of “infostealer” malware known as Stealerium that the company has seen used in multiple cybercriminal campaigns since May of this year. The malware, like all infostealers, is designed to infect a target’s computer and automatically send a hacker a wide variety of stolen sensitive data, including banking information, usernames and passwords, and keys to victims’ crypto wallets. Stealerium, however, adds another, more humiliating form of espionage: It also monitors the victim’s browser for web addresses that include certain NSFW keywords, screenshots browser tabs that include those words, photographs the victim via their webcam while they’re watching those porn pages, and sends all the images to a hacker—who can then blackmail the victim with the threat of releasing them.
“When it comes to infostealers, they typically are looking for whatever they can grab,” says Selena Larson, one of the Proofpoint researchers who worked on the company’s analysis. “This adds another layer of privacy invasion and sensitive information that you definitely wouldn’t want in the hands of a particular hacker.”
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