Rhysida Ransomware is a ransomware operation attributed to eCrime (RaaS), active since 2023. Ransomware group targeting healthcare and government. Key capabilities include: ChaCha20 encryption, British Library attack, Vice Society rebrand suspected.
Overview & Operations
Ransomware group targeting healthcare and government. The group has been active since 2023 and operates as part of the broader ransomware-as-a-service ecosystem. Notable technical characteristics include: ChaCha20 encryption, British Library attack, Vice Society rebrand suspected.
Rhysida Ransomware employs double extortion tactics, encrypting victim data while simultaneously exfiltrating sensitive information for leverage. Organizations that refuse to pay face public data exposure on the group's leak site.
- Operator: eCrime (RaaS)
- Active since: 2023
- Tooling: ChaCha20 encryption, British Library attack, Vice Society rebrand suspected
- Extortion model: Double extortion (encryption + data leak)
Tactics, Techniques & Procedures
Rhysida operators typically gain initial access through phishing, exploiting public-facing applications (VPN, RDP, Exchange), or purchasing access from initial access brokers (IABs). Post-compromise, they deploy Cobalt Strike or similar C2 frameworks for lateral movement before deploying the ransomware payload.
- Initial access: Phishing, vulnerability exploitation, RDP brute force, IAB purchases T1566.001 T1190
- Execution: PowerShell, WMI, PsExec for payload deployment T1059.001
- Persistence: Scheduled tasks, service creation, registry modifications T1053.005
- Defense evasion: Security tool tampering, Safe Mode exploitation, BYOVD T1562.001
- Lateral movement: RDP, SMB, WMI, admin shares T1021.002
- Exfiltration: Custom exfiltration tools, cloud storage, Rclone T1567
- Impact: File encryption with custom encryptor T1486
MITRE ATT&CK Mapping
| Tactic | Technique | Usage |
|---|---|---|
| Initial Access | T1190 Exploit Public-Facing App | VPN/RDP/Exchange exploitation |
| Execution | T1059.001 PowerShell | Post-exploitation scripting |
| Persistence | T1053.005 Scheduled Task | Persistence mechanism |
| Defense Evasion | T1562.001 Disable Security Tools | EDR/AV tampering |
| Credential Access | T1003.001 LSASS Memory | Credential dumping |
| Lateral Movement | T1021.002 SMB/Admin Shares | Network propagation |
| Exfiltration | T1567 Exfil Over Web Service | Data theft before encryption |
| Impact | T1486 Data Encrypted for Impact | Ransomware deployment |
Detection & Defense
- Backup strategy: Maintain offline, immutable backups with tested restoration procedures
- Network segmentation: Limit lateral movement paths between critical systems
- EDR deployment: Behavioral detection for ransomware indicators (mass file modification, shadow copy deletion)
- MFA enforcement: Protect RDP, VPN, and admin portals with phishing-resistant MFA
- Patch management: Prioritize VPN, Exchange, and remote access vulnerabilities
- Threat intelligence: Monitor for Rhysida IOCs and dark web activity
Protect Against Rhysida Ransomware
Mjolnir Security provides ransomware prevention, detection, and response services against Rhysida Ransomware and similar threats.
- Ransomware Readiness Assessment Evaluate your organization's resilience against Rhysida and similar ransomware operations with gap analysis and remediation recommendations.
- Ransomware Incident Response Rapid containment, negotiation support, and forensic investigation when ransomware strikes.
- 24/7 Incident Response Rapid containment and forensic investigation. Call +1 833 403 5875.
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