Threat Actor Spotlight: Qilin Ransomware

Executive Summary

Qilin is the world's most prolific RaaS operation, claiming 100+ victims monthly across all sectors.

Key Details

Affected Platform

Attack Surface

Recommended Action

Affected Environment

Windows, Linux, and VMware ESXi environments; enterprise platforms, remote access infrastructure including Citrix, RDP, and VPN.

Operational Impact

Data encrypted and exfiltrated; backup and HA systems disrupted; shadow copies deleted; security processes terminated.

Technical Root Cause

Credential abuse, LSASS dumping, BYOVD techniques, and exploitation of unpatched public-facing applications.

Recommended Mitigation

Enforce phishing-resistant MFA, patch internet-facing systems, deploy EDR with tamper protection, enable BYOVD driver blocklists.

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Full Technical Report

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References

CISA Ransomware Guide; SC World; OSIbeyond Qilin Analysis; SOCRadar Dark Web Profile; CM Alliance Cyber Attacks April 2026; MITRE ATT&CK S1242 / G1050; Breachsense Annual Report 2025.