Ads or Surveillance? Researchers Flag Suspicious Targeting of Starlink Users

Discover-Tech allegedly targeted Starlink users with digital ads to track their locations, according to sources cited in a new Reuters report.

Digital defense firm TrendAI found that an Israeli ad tech company was heavily targeting users of satellite internet service Starlink, probably to spy on them. That’s according to six people familiar with the matter, speaking to Reuters. Raphael Satter reported it on October 27 in a Reuters story, and the claims rest on sources, not on a published attribution.

“Researchers at TrendAI, a unit of Tokyo-based cybersecurity company Trend Micro, ‌concluded the Israeli company Discover-Tech was one of the biggest sources of digital ads shown to users of SpaceX’s Starlink service and that the ads were likely being used to geolocate or otherwise surveil them, according to the six people.” Reuters states.

TrendAI concluded that the company Discover-Tech was one of the biggest sources of digital ads shown to users of SpaceX’s Starlink. They believe the ads were likely used to geolocate users or otherwise surveil them.

“TrendAI™ Research observed large-scale use of advertising infrastructure for geolocation tracking, advertising technology surveillance, and intelligence gathering. Data from these activities is valuable for precise targeting of key individuals in sensitive locations, including active conflict zones.” reads the report published TrendAI. “SHADOW-EARTH-79 is also the number one bidder in 105 individual countries in Starlink traffic that we observed. It accounts for approximately 13% of all winning bid events in Starlink traffic, five times higher than average (approximately 3%) bids for other bidders, and the highest of any high-volume buyer. Starlink is widely used in conflict zones where terrestrial networks are degraded.”

SpaceX didn’t respond to requests for comment, and Discover-Tech and its chief executive didn’t respond over the past two weeks.

Starlink users make attractive targets. Governments around the world are trying to get a grip on satellite internet terminals, which route data through SpaceX satellites and not through nationally regulated telecom firms. That lets them sidestep local internet restrictions, work in hostile areas or coordinate action across battlefields. Ukraine’s military relies on Starlink for frontline communications and for directing drone strikes.

The findings come from advertising data collected by TrendAI. The data shows that Discover-Tech became one of the biggest bidders for ads shown to Starlink users worldwide. It was the top bidder in more than 100 countries, including several where Starlink is banned or restricted. Advertisers bid in online auctions to buy space for ads in browsers and apps.

“In Starlink IP space traffic that we observed, SHADOW-EARTH-79 is the second-largest winning bidder by raw volume. However, examining the statistics and saturation of the group’s ad impression buying strategy reveals an obvious skew towards buying ad impressions on Starlink addresses, compared with its overall footprint.” continues the report.

TrendAI published its report on October 15 but didn’t name Discover-Tech. Instead, it identified “an ad tech entity” called Shadow-Earth-79. Six sources say that’s TrendAI’s codename for Discover-Tech.

TrendAI didn’t directly explain why it left out the company’s name. It said its naming policy helps prevent mistakes and avoids labels that could confuse security teams, lead them to focus on the wrong risks or prompt the wrong response.

Starlink users are valuable targets for surveillance. Governments want more control over satellite internet services, which send data through SpaceX satellites rather than local telecom networks. Starlink lets users get around local internet restrictions, stay connected in dangerous areas and communicate on the battlefield.

Ukraine’s military uses Starlink for frontline communications and to help direct drone strikes.

Finding ways to track Starlink users has turned into a cottage industry. In May, the Israeli newspaper Haaretz and the website Intelligence Online separately reported that Israeli-owned businesses were pitching clients on ways to identify and track them. Haaretz said exploiting ad data appeared to play a key role.

On the same day as TrendAI’s report, the Canadian cyber watchdog Citizen Lab and the New York ad tech firm Confiant named Discover-Tech. Both said it abused the ad bidding process, which can leak data about internet users back to the bidder. Over time, a bidder can collect that data, collate it and merge it with other information to de-anonymize users and follow them around the web. In some cases it can also set them up for targeting with surveillance software.

Citizen Lab and Confiant said the ads appeared inside dozens of sensitive networks belonging to media organizations, governments and tech firms. Google, Comcast and other companies said they removed Discover-Tech from their ad platforms. At least one big US tech company and one international organization recently started internal inquiries into whether Discover-Tech’s ads targeted their employees, according to one of the six people and a seventh person familiar with the matter.

TrendAI’s report pointed to suspicious bidding patterns that suggested “targeting and tracking infrastructure” and not a commercial advertising operation.

“Overall, the design of this “customer-facing” front-end makes us believe that the system is more likely designed as a “surveillance” and “intelligence gathering” platform, rather than simply a platform for advertisement management.” the report concludes. “The collected evidence indicates with moderate-to-high confidence that SHADOW-EARTH-79’s advertising presence functions as targeting and tracking infrastructure rather than a commercial advertising operation. The anomalous bidding behavior, heavy dominance in sanctioned and conflict states, and pronounced over-bidding for Starlink address space establish intent to reach specific audiences in sensitive geographies.”

It noted an obvious skew toward Starlink-aimed ads. It also found that Shadow-Earth-79 was the top ad buyer in Syria, Libya, Yemen and South Sudan, and the second biggest in Afghanistan. Few Western brands are chasing shoppers in Libya at the moment, and the report says demand for legitimate Western advertising in sanctioned or active-conflict states is effectively zero.

The entity also won an implausibly dominant share of bids in several other countries, including Hungary, Israel, Egypt, Azerbaijan and Venezuela. The researchers were convinced Discover-Tech was behind it and discussed naming it in the report, according to the six sources. They dropped the idea after TrendAI executives raised legal concerns, five of those sources said.

It wouldn’t be the first time. Earlier this year, Reuters reported that Palo Alto stripped explicit references to China from a report on a global cyberespionage campaign, even though its researchers were confident Beijing was behind the hacking. Reuters said the report was watered down over fears that naming China would cause problems for Palo Alto’s operations there, which were already under scrutiny after a Beijing directive told domestic companies not to use its products. Palo Alto said the lack of attribution had nothing to do with China’s procurement rules and called any suggestion otherwise speculative and false.

Executives fear that exposing surveillance operations could draw retribution, and industry experts tell Reuters the sector has a habit of staying quiet.

“Self-censorship is common in the cybersecurity industry, especially when executives fear that exposing surveillance operations could draw retribution, industry experts say.” Reuters concludes.

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Pierluigi Paganini

(SecurityAffairs – hacking, Starlink)