DragonForce Abuses Microsoft Teams Relays to Hide Ransomware C2 Traffic
What the Backdoor.Turn Campaign Means for Your Detection Coverage and Compliance Posture
Published 2026-06-19
# DragonForce Abuses Microsoft Teams Relays to Hide Ransomware C2 Traffic
Symantec and Carbon Black (both Broadcom-owned) have published findings confirming that DragonForce ransomware actors deployed a custom Go-based remote access trojan—Backdoor.Turn—against a major U.S. services firm by routing command-and-control traffic through legitimate Microsoft Teams relay infrastructure.
What Happened
DragonForce operators embedded Backdoor.Turn inside a targeted environment and used Microsoft Teams relay nodes as a covert C2 channel. Because the outbound traffic blends with ordinary Teams signaling, conventional network-layer controls—firewall rules, domain blocklists, even many next-gen IDS signatures—have no natural detection surface against it. The Go-based RAT gives the threat actor persistent remote access, lateral movement capability, and a staging point for ransomware deployment, all while appearing as routine collaboration traffic to most monitoring stacks.
Why This Matters for Regulated Organizations
This technique is not a theoretical edge case. It is an active, confirmed intrusion method used against a named enterprise target. For organizations operating under NIS2, SOC 2, ISO 27001, HIPAA, or PCI DSS, the compliance implications are direct:
- NIS2 Article 21 requires organizations to implement anomaly detection and incident response capabilities capable of catching exactly this class of living-off-trusted-infrastructure (LOTI) attack.
- SOC 2 CC7.2 demands that monitoring controls detect threats in the environment—Teams-tunneled C2 will evade controls that only inspect unknown domains.
- ISO 27001 Annex A 8.16 calls for continuous monitoring of networks and systems for anomalous behavior, not just known-bad indicators.
- HIPAA Security Rule § 164.312(b) and PCI DSS Requirement 10 both mandate audit logging and anomaly-based alerting that can surface unusual relay-protocol behavior.
A single gap in behavioral monitoring becomes a multi-framework compliance finding the moment a regulator or auditor asks how you would have detected this.
What Your Team Should Do in the Next 7–30 Days
Within 7 days:
- Audit your EDR and SIEM for behavioral rules that flag unusual processes initiating Teams relay connections—focus on non-Teams parent processes spawning relay traffic.
- Verify that your network monitoring ingests Teams relay metadata (IP ranges, relay endpoints) and not only DNS/domain data.
- Brief your incident response retainer or internal IR team on the LOTI technique so triage playbooks are updated.
Within 30 days:
- Map your current detection controls against NIS2 Article 21, SOC 2 CC7.2, ISO 27001 A.8.16, HIPAA § 164.312(b), and PCI DSS Requirement 10 to identify coverage gaps surfaced by this campaign.
- Implement or validate behavioral baselining for all sanctioned collaboration tools (Teams, Slack, Zoom) so relay-channel anomalies trigger alerts.
- Conduct a tabletop exercise simulating a Backdoor.Turn-style intrusion; document results as evidence for your next audit cycle.
- Review privileged-account access to Teams admin surfaces—compromised admin credentials accelerate relay-abuse scenarios significantly.
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