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Sandworm Leverages SSH-over-Tor for Covert Network Access

First seen 28 Apr 2026, 17:35 UTC • •

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ThreatCluster AI
ThreatCluster •April 29, 2026 at 17:06 UTC
  • •Sandworm has adopted SSH-over-Tor tunneling for covert network access.
  • •The group targets government, energy, and research sectors.
  • •The attack begins with spear-phishing to gain initial access.

Sandworm (APT-C-13), a state-sponsored cyber threat group, has advanced its tactics by employing SSH-over-Tor tunneling to maintain long-term, covert access to targeted networks. This new technique represents a significant upgrade from previous methods, allowing for anonymous and encrypted communications. The group has historically targeted government entities, energy sectors, and research institutions since its inception in 2014. The attack typically initiates with spear-phishing campaigns to gain initial access. The full scope of the impact is still being assessed, but the shift in tactics indicates a more sophisticated approach to cyber espionage. Current reports suggest that this campaign is ongoing, with potential implications for national security and critical infrastructure. Specific tools and CVEs have not been disclosed in the articles, but the use of Tor suggests a focus on evasion and stealth.

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Updated 172d ago How this analysis works

Timeline

2026-04-28
Sandworm's new SSH-over-Tor technique reported
Date unknown
Initial spear-phishing campaigns launched

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