Ransom
Executed
Ransom
Detected
Range
Detected
Ransom
Respond
Range
Respond
2025-03-
08_14:25:
50.184
25:50.7 530.000 ms 25:50.7 17.000 ms
2025-03-
08_14:25:
54.424
25:55.0 528.000 ms 25:55.0 18.000 ms
Ransomware testing on Ubuntu 22.04 (Table 9-
12) showed that the system was able to detect and
respond to threats with stable performance.
Shougolock recorded an MTTD of 548.8 ms and an
MTTR of 17.2 ms, while AvosLocker, Interlock, and
MarioLocker showed MTTDs in the range of 529.2–
531.0 ms and MTTRs between 17.8–18.2 ms.
Detection and response times for all samples were
consistent within a narrow range, indicating system
stability. All samples were also successfully detected
by VirusTotal, confirming the system's accuracy and
reliability in identifying ransomware.
Overall, the system demonstrated excellent and
consistent performance in detecting and responding
to ransomware in Ubuntu 18.04, 20.04, and 22.04
environments. On Ubuntu 18.04, the average MTTD
was 514.0 ms and MTTR was 14.4 ms, indicating
detection capabilities of less than one second and
extremely fast response times. Ubuntu 20.04 recorded
the best performance in terms of fast detection and
stable response, while Ubuntu 22.04 showed slightly
slower detection with an MTTD of 534.8 ms and an
MTTR of 17.8 ms, possibly due to differences in
system optimization or higher system load. However,
the stable response time across all versions
demonstrates the system's efficiency in handling
threats. Consistent validation by VirusTotal
throughout the testing further reinforces the reliability
and accuracy of this system, while small differences
in MTTD and MTTR values between samples are
primarily due to variations in the complexity and
behavior of each ransomware.
3.1 Assessment of Ransomware Impact
within MTTD and MTTR
In addition to measuring detection and response
times, we assessed the practical impact of
ransomware within the MTTD and MTTR windows.
Observations showed that only a small number of
files were encrypted before the malicious process was
terminated. For instance, MarioLocker typically
encrypted 1–2 files during the ~500 ms detection
window, while AvosLocker and Interlock affected
fewer than 3 files. These findings highlight that
although the system does not completely prevent file
encryption, the sub-second detection and
millisecond-level response significantly reduce the
potential damage compared to uncontrolled
execution. However, this study did not perform a
detailed quantitative analysis of file types and sizes
encrypted during the window, which remains a
limitation to be addressed in future work.
4 CONCLUSION
The ransomware detection and response system
developed in a Linux environment using Auditd and
VirusTotal has proven effective in detecting and
handling ransomware threats. The system
successfully detected four types of ransomware
(Shougolock, AvosLocker, InterLock, and
MarioLocker) with an average MTTD of 503.7 ms
and an average MTTR of 15.8 ms across three Ubuntu
versions (18.04, 20.04, and 22.04). Ubuntu 20.04
showed the best detection performance, while Ubuntu
18.04 had the highest response speed.
These findings highlight that Linux servers, often
considered inherently secure, still require proactive
defense mechanisms. The system provides a
lightweight and practical approach that can be
deployed in real-world environments to minimize
ransomware impact.
However, this study is limited to four ransomware
families and relies on VirusTotal, which may reduce
effectiveness against unknown or zero-day
ransomware. These limitations point to opportunities
for further research. Future enhancements include
integrating artificial intelligence (AI) for behavioral
analysis, reducing false positives, and improving
adaptability against emerging ransomware threats.
REFERENCES
Adkins, H., Beyer, B., Blankinship, P., Lewandowski, P.,
Oprea, A., & Stubblefield, A. (2020). Building secure
and reliable systems: Best practices for designing,
implementing, and maintaining systems. Google.
https://sre.google/books/
Guo, J., Liang, H., & Long, J. (2024). Leveraging file
system characteristics for ransomware mitigation in
Linux operating system environments. Research
Square, 1–6. https://doi.org/10.21203/rs.3.rs-
000000/v1 (if no DOI, you can omit this line)
Neweva, W., Fitzwilliam, O., & Waterbridge, J. (2024).
Forensic analysis of live ransomware attacks on Linux-
based laptop systems: Techniques and evaluation.