A new ransomware family called Kyber has been deployed in attacks combining a Rust-based Windows encryptor with a Linux ESXi variant on the same victim network, and its Windows build is one of the first in the wild to advertise post-quantum cryptography. Rapid7 analysed both variants during a March 2026 incident response and found the Windows build genuinely uses Kyber1024 (a NIST-selected post-quantum key-encapsulation algorithm) plus X25519 to wrap the AES-CTR keys that actually encrypt files, matching its ransom-note claims. The Linux ESXi variant makes the same post-quantum marketing claim but actually uses ChaCha8 with RSA-4096 - pure marketing theatre rather than real crypto defense. For victims the distinction does not matter: without the attacker's private key the files are unrecoverable regardless of algorithm. Windows-encrypted files get a '.#~~~' extension; Linux gets '.xhsyw'. The ESXi variant enumerates all VMs, encrypts datastore files, defaces management interfaces, adds crontab persistence, and terminates VMs. The Windows variant deletes shadow copies, disables boot repair, kills SQL/Exchange/backup services, clears event logs, wipes the Recycle Bin, and ships with an experimental Hyper-V shutdown feature. Only one victim appears on the Kyber leak site so far (a multi-billion-dollar American defence contractor and IT services provider), meaning most current victims are still in the extortion window and not publicly known.
Check Point researchers gained visibility into a SystemBC command-and-control server used by an affiliate of The Gentlemen ransomware-as-a-service operation and found over 1,570 compromised corporate networks that have not been publicly disclosed. The group's own data leak site only lists about 320 victims, meaning the real footprint is nearly 5x larger than public reporting suggests. The Gentlemen emerged in July 2025 and has become one of the most prolific RaaS operations. It uses a Go-based locker targeting Windows, Linux, NAS, and BSD systems, operates a classic double-extortion model, and abuses legitimate drivers plus custom tooling to bypass defenses. SystemBC is a SOCKS5 tunneling proxy that uses RC4-encrypted C2 communications and can download and execute additional malware in memory. Attack chain: initial access via internet-facing services or compromised credentials, followed by reconnaissance, Cobalt Strike deployment, SystemBC tunneling, lateral movement using Group Policy Objects for domain-wide compromise, then the encryptor. A notable TTP: during lateral movement, The Gentlemen pushes a PowerShell script that disables Windows Defender real-time monitoring, adds broad exclusions for staging shares and its own process, shuts down the firewall, re-enables SMB1, and loosens LSA anonymous access controls before deploying the ransomware binary on each reachable host. The ESXi variant shuts down virtual machines, adds persistence via crontab, and inhibits recovery. Victim geography spans US, UK, Germany, Australia, and Romania.
Microsoft Threat Intelligence published a detailed report on Storm-1175, a China-based financially motivated group that deploys Medusa ransomware at extreme speed - sometimes moving from initial access to full ransomware deployment within 24 hours. The group exploits internet-facing systems using a mix of zero-day and recently disclosed (n-day) vulnerabilities, having weaponized over 16 flaws across 10 products since 2023. Two vulnerabilities were exploited as zero-days a full week before public disclosure. Recent targets include healthcare, education, finance, and professional services organizations in the US, UK, and Australia. Their playbook: exploit a web-facing flaw, create persistence via new accounts and web shells, steal credentials with Mimikatz, disable Defender via registry modifications, exfiltrate data with Rclone, then deploy Medusa across the network.
Google moved its AI-powered ransomware detection for Google Drive from beta to general availability, enabled by default for all paid Workspace users. When ransomware encrypts files on a synced desktop, Drive immediately pauses syncing to protect cloud copies, alerts both the user and IT admins, and offers bulk file restoration to roll back to pre-infection versions. Google says the GA model catches 14 times more infections than the beta, covering a wider range of encryption patterns at faster detection speeds.
One group, four major compromises, nine days. TeamPCP started by backdooring Aqua Security's Trivy vulnerability scanner on March 19 - then used the stolen CI/CD credentials to poison LiteLLM, Checkmarx tools, and Telnyx one after another. Each compromised tool handed them the keys to the next target. They've now partnered with the Vect ransomware gang to turn stolen access into extortion.
TrustStrike Labs