Russian SIM‑swap Ops Hijack Signal and WhatsApp for Covert C2

U.S. intelligence agencies have flagged Russian‑linked threat groups that are compromising users of encrypted messengers such as Signal and WhatsApp. The actors combine SIM‑swap attacks with classic phishing to seize control of victims’ phone numbers, then use the trusted messaging apps as stealthy command‑and‑control channels and for exfiltrating sensitive data.

For defenders, the abuse of end‑to‑end encrypted platforms means traditional network‑based detection is less effective. Organizations must monitor for anomalous SIM‑swap activity, enforce strict MFA on telecom accounts, and treat any unsolicited messages on these apps as potential intrusion indicators. Early detection and rapid revocation of compromised numbers are critical to prevent the attackers from maintaining a covert communications foothold.

Categories: Threat Intelligence, Identity & Access Management

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