Data Exfiltration Incident: 5,000 Files Compromised and Deleted
Severity: Medium (Score: 51.9)
Sources: Ibm
Published: · Updated:
Keywords: data, stole, identifying, exfiltrated, part, memory, forensics
Severity indicators: ics, rat
Summary
A recent cyberattack resulted in the deletion of 5,000 files from a company, raising significant concerns about data recovery and exfiltration. The threat actor compressed the stolen files into archives for upload before deleting them from the system. The incident highlights the challenges in identifying what data was accessed and exfiltrated, particularly due to limitations in operating system logging and potential tampering by the attacker. Memory forensics emerged as a crucial tool for investigation, revealing that over 80,000 artifacts remained in memory, including file names and paths, despite the deletion of files from disk. The ability to recover sensitive information, such as passwords and command histories, underscores the importance of timely memory capture during incidents. Organizations are encouraged to implement proactive measures, such as enhanced logging policies, to improve visibility into file access activities. This incident serves as a reminder of the complexities involved in incident response and data recovery. Key Points: • 5,000 files were deleted during a cyberattack, complicating data recovery efforts. • Memory forensics revealed over 80,000 artifacts, aiding in identifying exfiltrated files. • Proactive logging policies are essential for improving visibility into file access during incidents.
Detailed Analysis
**Impact** Approximately 5,000 files were exfiltrated and subsequently deleted from the compromised environment. The affected data’s nature remains unclear, complicating assessment of regulatory, legal, and operational impacts. The incident potentially risks sensitive information including patient records, corporate secrets, or financial data, depending on the victim organization’s sector, which is not specified in the sources. The deletion of files also presents significant challenges for data recovery and business continuity. **Technical Details** The threat actor compressed exfiltrated files into archive formats for staging before deletion. Memory forensics revealed artifacts such as file names, full file paths, and even the password (“findme111”) used for encrypted archives, enabling potential recovery of exfiltrated data. The attack leveraged limited operating system logging and tampering with logs to evade detection. No specific malware, CVEs, or infrastructure details were provided. The kill chain stages identified include initial access, lateral movement, data staging, exfiltration, and data deletion. **Recommended Response** Enable and maintain Windows object access audit policies with at least 90 days of log retention to improve visibility into file operations. Deploy endpoint detection and response (EDR) and data loss prevention (DLP) solutions capable of alerting or blocking suspicious file activities. Prioritize timely acquisition of memory dumps during incident response to capture volatile artifacts. Monitor for unusual archive creation, file deletion events, and unauthorized use of encryption passwords in memory.
Source articles (2)
- They stole… what? Identifying exfiltrated data: Part 1 — Ibm · 2026-05-27
When a cyberattack leaves 5,000 files from a company deleted, the challenge isn’t just detecting the breach, but recovering the lost data. In this three-part series, we’ll guide you through a realisti… - They stole… what? Identifying exfiltrated data: Part 3 — Ibm · 2026-05-27
Memory forensics is often an overlooked capability. However, with the right skills and following a timely capture of the memory contents, it can provide a treasure trove of information. In this third…
Timeline
- 2026-05-27 — Cyberattack leads to data deletion: A threat actor deleted 5,000 files from a company after compressing them for exfiltration. This incident raised concerns about data recovery and forensic analysis.
- 2026-05-27 — Memory forensics reveals critical artifacts: Analysis of memory contents showed over 80,000 artifacts, including file names and paths, aiding investigations into the exfiltrated data.
Related entities
- Data Breach (Attack Type)
- Ransomware (Attack Type)
- T1041 - Exfiltration Over C2 Channel (Mitre Attack)
- T1070 - Indicator Removal (Mitre Attack)
- T1567.002 - Exfiltration to Cloud Storage (Mitre Attack)
- OneDrive (Tool)
- MemProcFS (Tool)
- Volatility (Tool)
- SharePoint (Platform)
- Windows (Platform)