Full Report
Key Takeaways Case Summary The intrusion started with the exploitation of CVE-2023-22527, a critical remote code execution vulnerability in Confluence, against a Windows server. The first indication of threat actor … Read More
Analysis Summary
# Incident Report: Confluence Exploit Leads to LockBit Ransomware Deployment
## Executive Summary
This incident involved a rapid ransomware deployment initiated by exploiting a critical vulnerability in an exposed Windows Confluence server (CVE-2023-22527). The threat actor quickly established remote access using AnyDesk, escalated privileges, moved laterally using RDP, and exfiltrated sensitive data before deploying LockBit ransomware in approximately two hours (Time to Ransom). The response requires full environment remediation and hardening of public-facing services.
## Incident Details
- Discovery Date: *Not explicitly stated, but implied shortly after the two-hour TTR.*
- Incident Date: *Within a two-hour window leading to ransomware deployment.*
- Affected Organization: *Not publicly disclosed.*
- Sector: *Unknown/Not disclosed.*
- Geography: *Unknown/Not disclosed.*
## Timeline of Events
### Initial Access
- Date/Time: *Beginning of the intrusion.*
- Vector: **Exploitation of public-facing application (CVE-2023-22527)**.
- Details: The threat actor exploited the critical RCE vulnerability in a Windows Confluence server. Initial activity included execution of system discovery commands (`net user`, `whoami`).
### Lateral Movement
- Date/Time: *Shortly after initial access.*
- Vector: **Remote Desktop Protocol (RDP)**.
- Details: Attackers utilized RDP for lateral movement. They also deployed ransomware by copying files over **SMB shares** and using **PDQ Deploy** for automated distribution.
### Data Exfiltration/Impact
- Date/Time: *Prior to or concurrent with ransomware deployment.*
- Vector: **Rclone to Cloud Storage**.
- Details: Sensitive data was exfiltrated using Rclone to MEGA.io cloud storage. The ultimate impact was the deployment of **LockBit ransomware** across the environment. The TTR was approximately two hours.
### Detection & Response
- Date/Time: *Detection occurred following ransomware deployment.*
- Details: Detection involved identifying multiple forensic artifacts related to LockBit, Mimikatz, and Metasploit activity. Response efforts focused on containment and eradication (see Response Actions section).
## Attack Methodology
- Initial Access: Exploit Public-Facing Application (CVE-2023-22527).
- Persistence: Established persistence via **AnyDesk** configured with a preset password.
- Privilege Escalation: *Implied, necessary for wide-scale deployment, but specific method details were truncated.*
- Defense Evasion: Terminated processes belonging to a prior threat actor to ensure exclusive control.
- Credential Access: Used **Mimikatz**.
- Discovery: Performed Network Service Discovery (`net user`, `whoami`, `tasklist`, WMI).
- Lateral Movement: **RDP (T1021.001)**, SMB shares, and **PDQ Deploy (T1072)**.
- Collection: Data collected using unspecified methods prior to exfiltration.
- Exfiltration: **Rclone** used to transfer data to **MEGA.io** cloud storage (T1567.002).
- Impact: **Data Encrypted for Impact (T1486)** via LockBit ransomware.
## Impact Assessment
- Financial: *Not specified.*
- Data Breach: Sensitive data was exfiltrated prior to encryption. *Type and volume unknown.*
- Operational: Significant operational disruption due to LockBit ransomware encryption. Time to Ransom was rapid (approx. 2 hours).
- Reputational: *Not specified.*
## Indicators of Compromise
- **Network indicators:** (None explicitly listed as defanged, but C2 frameworks like Metasploit were used).
- **File indicators:** LockBit ransomware files, AnyDesk components.
- **Behavioral indicators:** Suspicious use of `mshta` to fetch a Metasploit stager, process termination (likely prior threat actor residue), extensive use of RDP post-initial compromise, Use of **PDQ Deploy** for mass execution.
## Response Actions
- **Containment:** *Not explicitly detailed in the summary, but typical steps would follow detection.*
- **Eradication:** Eradication would involve removing remnants of the threat actor activity, including the LockBit deployment, AnyDesk, and post-exploitation tools (Mimikatz, Metasploit payloads).
- **Recovery:** Restoring systems from backups following remediation and ensuring the root vulnerability (CVE-2023-22527) is patched.
## Lessons Learned
- Critical vulnerabilities in public-facing services like Confluence (CVE-2023-22527) provide immediate remote code execution pathways.
- The Time to Ransom was extremely short (2 hours), indicating that the attackers automated much of their post-exploitation activity once initial access to the Windows server was achieved.
- Attackers cleared evidence of prior threat actors, suggesting potential chaining of exploits or initial foothold takeover.
## Recommendations
- **Patch Management:** Immediately patch all public-facing applications, especially Confluence, against CVE-2023-22527.
- **Hardening:** Review and restrict RDP access, ensuring only necessary internal hosts or secure jump points can utilize it.
- **Monitoring:** Implement enhanced monitoring for anomalous execution chains (e.g., `curl`/`mshta` execution from a web service process) and the installation/configuration of remote access tools like AnyDesk.
- **Segmentation:** Improve network segmentation to limit the impact of lateral movement via SMB or RDP once perimeter defenses are breached.