NCSC’s High-Stakes Warning on State-Sponsored Hijacking of Your Messaging Apps
Do Son 
In an era where digital connectivity is the lifeblood of professional and personal life, the National Cyber Security Centre (NCSC) has issued a stern warning regarding the shifting tactics of state-sponsored threat actors. While platforms like WhatsApp, Signal, and Messenger are daily staples for billions, they have become a primary battlefield for Russian-based actors and other global persistent threats.
The warning is specifically tailored toward “high-risk individuals”—those whose public status or professional roles provide a gateway to sensitive information. According to the NCSC, these individuals face a heightened probability of attack because of their “potential access to sensitive information and important people”.
The list of previous aggressors is a “who’s who” of global cyber-espionage, including China’s APT31, Iran’s IRGC, and the Russian Federal Security Service (FSB) actor known as Star Blizzard.
The methods used by these actors are increasingly deceptive, moving past standard malicious links into the realm of account hijacking and silent monitoring. Attackers are no longer just looking to steal a password; they are looking to inhabit your digital life.
Key techniques observed include:
- Credential Theft: Tricking targets into sharing login or account recovery codes.
- Silent Persistence: Attempting to “add their own device to your account without you noticing”.
- Infiltration: Joining group chats without detection to monitor private discussions.
- Social Engineering: Impersonating known contacts or using malicious QR codes to deliver payloads.
The NCSC emphasizes that while social engineering can target anyone, high-risk individuals must adhere to a more rigorous security posture. “Do not share sensitive information via messaging apps” remains the golden rule for personal accounts.
A Checklist for Resilience:
- Corporate Boundaries: Use organizationally provided messaging services for work and follow internal policies.
- Verification Hygiene: Never share verification codes and avoid scanning unexpected QR codes.
- Multi-Factor Protection: Enable two-step verification—specifically “Registration Lock” for Signal users—and utilize passkeys where supported.
- Account Auditing: Regularly review linked devices and group memberships, removing any unrecognized participants.
- Data Minimization: Use disappearing messages to limit the data available to an intruder, though the NCSC notes you should “have regard to any applicable record keeping requirements”.
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