| CyberScoop cyberscoop.com
By
Tim Starks

March 20, 2026

It echoes earlier alerts from the Netherlands and Germany, and is the latest to warn about targeting of Signal users and others.

Russian intelligence-affiliated hackers have gained access to thousands of users’ messaging apps with a global phishing campaign, the FBI and the Cybersecurity and Infrastructure Security Agency warned in a public service announcement on Friday.

The high-value targets they’re pursuing include current and former U.S. government officials, political figures, military personnel and journalists, the two agencies said in the joint PSA about the hackers’ attempts to infiltrate commercial messaging applications (CMAs).

The U.S. alert comes on the heels of an earlier warning from Dutch authorities, who said last week that Russian hackers were “engaged in a large-scale global attempt” to take over WhatsApp and Signal accounts. The Dutch warning likewise followed a similar warning from Germany in February.

The U.S. agencies emphasized that the hackers had not been able to bypass end-to-end encryption, instead manipulating users into giving up access. The scheme involves hackers posing as Signal help personnel, then inviting them to click a link or provide verification codes or account personal identification number.

“After compromising an account, malicious actors can view the victims’ messages and contact lists, send messages, and conduct additional phishing against other CMA accounts,” the PSA explains. “(Note: reporting shows that the threat actors specifically target Signal accounts but can apply similar methods against other CMAs).”

However, “CMA users who strengthen their personal cybersecurity and defend against social engineering attempts can reduce the risk of account compromise and limit the effectiveness of the threat actors’ current tactics, techniques, and procedures,” the agencies said.

The Russian campaign is just the latest to seek to bypass the protections commercial messaging apps offer. CISA in November warned about spyware targeting of messaging apps.

There sometimes has been a Russian intelligence nexus to the recent targeting. Google Threat Intelligence Group shined a spotlight last year on Russian attempts to target Signal users in Ukraine.

‘We anticipate the tactics and methods used to target Signal will grow in prevalence in the near-term and proliferate to additional threat actors and regions outside the Ukrainian theater of war,” the company said.

www.nsb.gov.tw
In recent years, the international community has shown growing concerns over cybersecurity issues deriving from China-developed mobile applications (apps). Governments and independent research institutions worldwide have already issued warnings concerning data breaches in users’ communication security. To prevent China from illegally acquiring personal data of Taiwan’s nationals, National Security Bureau (NSB) has reviewed cybersecurity reports from countries around the world and organized relevant information, as per the National Intelligence Work Act. Subsequently, the NSB informed and coordinated with the Ministry of Justice Investigation Bureau (MJIB) and the Criminal Investigation Bureau (CIB) under the National Police Agency to conduct random inspection on several China-developed mobile apps. The results indicate the existence of security issues, including excessive data collection and privacy infringement. The public is advised to exercise caution when choosing mobile apps.

The 5 China-developed apps selected for inspection, consisting of rednote, Weibo, TikTok, WeChat, and Baidu Cloud, are widely used by Taiwanese nationals. The MJIB and CIB adopted the Basic Information Security Testing Standard for Mobile Applications v4.0 announced by the Ministry of Digital Affairs, and evaluated the apps against 15 indicators under 5 categories of violation, consisting of personal data collection, excessive permission usage, data transmission and sharing, system information extraction, and biometric data access.

All 5 apps have shown serious violations across multiple inspection indicators. Notably, the rednote fails to meet all 15 inspection standards. Weibo and TikTok violate 13 indicators, separately, as well as 10 for WeChat and 9 for Baidu Cloud. These findings suggest that the said China-made apps present cybersecurity risks far beyond the reasonable expectations for data-collection requirement taken by ordinary apps.

All 5 China-made apps are found to have security issues of excessively collecting personal data and abusing system permissions. The violations include unauthorized access to facial recognition data, screenshots, clipboard contents, contact lists, and location information. As to the category of system information extraction, all apps were found to collect data such as application lists and device parameters. Furthermore, as far as biometric data are concerned, users’ facial features may be deliberately harvested and stored by those apps.

With regard to data transmission and sharing, the said 5 apps were found to send packets back to servers located in China. This type of transmission has raised serious concerns over the potential misuse of personal data by third parties. Under China’s Cybersecurity Law and National Intelligence Law, Chinese enterprises are obligated to turn over user data to competent authorities concerning national security, public security, and intelligence. Such a practice would pose a significant security breach to the privacy of Taiwanese users, which could lead to data collection by specific Chinese agencies.

A wide range of countries, such as the US, Canada, the UK, and India, have already publicly issued warnings against or bans on specific China-developed apps. The European Union has also launched investigations under the General Data Protection Regulation framework into suspected data theft involving certain China-made apps. Substantial amount of fines are imposed in those cases. In response to the cybersecurity threats, the Taiwanese government has prohibited the use of Chinese-brand products regarding computer and communications technology within official institutions. Both software and hardware are included.

The NSB coordinates with the MJIB and CIB to test the 5 inspected China-developed apps, and confirms that widespread cybersecurity vulnerabilities indeed exist. The NSB strongly advises the public to remain vigilant regarding mobile device security and avoid downloading China-made apps that pose cybersecurity risks, so as to protect personal data privacy and corporate business secrets.

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