Ransomware Attack Stopped in Its Tracks
This case study provides a real-world example of Sigma’s incident response process in identifying and containing a ransomware attack before execution.
The Problem
An employee unknowingly downloaded a malicious file disguised as an update through their Chrome browser. Once inside the environment, the file began actively compromising the system by:
- Searching for saved credentials from web browsers like Chrome and Edge
- Scanning high-value systems and accounts across the network
- Establishing persistence through scheduled hidden tasks and startup modifications
- Communicating with known malicious infrastructure to download additional payloads
Without rapid intervention, this activity would have likely led to ransomware execution, resulting in encrypted systems, stolen sensitive date, operational downtime, and costly recovery efforts.
The Sigma Solution
Sigma’s security team identified and responded to the threat immediately, activating our incident response protocols, stopping the attack before it could escalate
Our response included:
- Immediate containment: Isolated the affected machine from the network
- Credential protection: Reset user passwords to prevent unauthorized access
- Threat blocking: Blocked malicious domains and IP addresses associated with the attack
- Remediation: Removed all malicious files from the system
- Proactive defense: Conducted threat hunting across the environment to ensure no further compromise
- Continuous improvement: Enhanced detection rules to identify similar threats faster in the future
Conclusion
The threat was fully neutralized before ransomware could execute, preventing disruption to business operations and protecting sensitive data.
Sigma’s rapid response and proactive security measures ensured the organization remained secure, operational, and resilient against evolving cyber threats.
How Sigma Helps
This incident highlights the value of having an experienced incident response team capable of:
- Detecting threats early
- Acting decisively
- Containing attacks before they escalate
Sigma Information Group provides proactive monitoring and rapid incident response to stop threats before they impact your business. Our team works as an extension of your organization, ready to detect, respond, and recover from cyber incidents in real time.
Contact Us
To learn more about how Sigma Information Group can support your firm’s cybersecurity needs, fill out the following form, or call us at 512-664-7900. We look forward to working with you!