Full Report
Discover the insidious tactics of the Qilin ransomware group, notorious for their $50 million attack on the healthcare sector, impacting key NHS hospitals.
Analysis Summary
# Tool/Technique: Qilin Ransomware (aka Agenda)
## Overview
Qilin is a sophisticated Ransomware-as-a-Service (RaaS) operation that targets large enterprises, notably within the healthcare and critical infrastructure sectors. Written in Go (Golang) and Rust, it is designed for cross-platform impact, allowing attackers to customize encryption parameters for specific environments. The group is known for "double extortion," where they both encrypt data and threaten to leak sensitive information on their dedicated leak site.
## Technical Details
- **Type:** Malware family (Ransomware-as-a-Service)
- **Platform:** Windows, Linux, VMware ESXi
- **Capabilities:** Cross-platform encryption, service/process termination, virtual machine suspension, automated self-distribution, and credential harvesting.
- **First Seen:** July 2022 (Initially identified as "Agenda")
## MITRE ATT&CK Mapping
- **[TA0008 - Lateral Movement]**
- [T1570 - Lateral Tool Transfer]
- [T1563.002 - Remote Service Session Hijacking: RDP Hijacking]
- **[TA0005 - Defense Evasion]**
- [T1562.001 - Impair Defenses: Disable or Modify Tools]
- [T1070.004 - Indicator Removal on Host: File Deletion]
- **[TA0007 - Discovery]**
- [T1083 - File and Directory Discovery]
- [T1135 - Network Share Discovery]
- **[TA0040 - Impact]**
- [T1486 - Data Encrypted for Impact]
- [T1489 - Service Stop]
- [T1490 - Inhibit System Recovery]
## Functionality
### Core Capabilities
- **Multi-Platform Encryption:** Utilizes Go and Rust to target Windows and Linux/ESXi environments.
- **Service & Process Termination:** Automatically stops databases, antivirus agents, and backup services to ensure files are not locked and cannot be recovered.
- **Inhibit Recovery:** Deletes Shadow Copies and uses the `cipher /w` command to wipe free space, preventing forensic recovery of deleted files.
- **Customizable Execution:** Highly parameter-driven, allowing operators to toggle features like wallpaper changes, ransom note creation, and encryption depth.
### Advanced Features
- **Self-Distribution:** Includes built-in mechanisms to spread across a network using integrated tools like **PsExec (v2.43)**.
- **Virtualization Targeting:** Specific flags (`--no-vm`, `--spread-vcenter`) to target or avoid VMware environments and manage clusters via PowerShell (`Stop-Cluster`).
- **Network Awareness:** Scans and encrypts network shares to maximize operational disruption.
## Indicators of Compromise
*Note: Specific hashes and IPs vary by campaign. The following are behavioral and structural indicators based on Qilin's design.*
- **File Names:** `[random_extension]-readme.txt` (Ransom note)
- **Network Indicators:**
- `qilinlytgzq[....]onion` (Defanged TOR leak site)
- **Behavioral Indicators:**
- `powershell -Command "Stop-Cluster -Force"`
- `cipher /w:"[Drive_Letter]:\"`
- Execution of `psexec.exe` for lateral movement.
- Termination of processes like `sql.exe`, `oracle.exe`, `veeam.exe`.
## Associated Threat Actors
- **Qilin (formerly Agenda)**
## Detection Methods
- **Signature-based:** Detect the unique Golang/Rust binary structures and the specific ransom note templates.
- **Behavioral detection:**
- Monitor for mass file renaming/encryption activities.
- Alert on the use of `vssadmin.exe delete shadows` or `cipher /w`.
- Identify unauthorized execution of `PsExec` or `Stop-Cluster` commands.
- **YARA:** Target the unique string obfuscation and the command-line argument parser specific to the Qilin codebase.
## Mitigation Strategies
- **Offline Backups:** Maintain immutable, air-gapped backups to ensure recovery without paying the ransom.
- **Endpoint Protection:** Deploy EDR/XDR solutions configured to block unauthorized service termination and volume shadow copy deletion.
- **Network Segmentation:** Limit lateral movement by segmenting critical healthcare systems and administrative interfaces (like vCenter).
- **Credential Hardening:** Enforce MFA on all remote access points (VPN, RDP) to prevent initial access via stolen credentials.
## Related Tools/Techniques
- **PsExec:** Used for lateral movement and remote execution.
- **Rclone:** Frequently used by RaaS groups for data exfiltration prior to encryption.
- **BlackCat/ALPHV:** Similar Rust-based architecture and affiliate structure.