Ransomware Protection
How to Detect Ransomware Early: Warning Signs & Monitoring
Early ransomware detection focuses on catching attackers during the 3-21 day dwell time before encryption by monitoring for: unusual login patterns and credential abuse, PowerShell and scripting anomalies, lateral movement tools (PsExec, Mimikatz), shadow copy deletion attempts, mass file modification patterns, and anomalous outbound data transfers.
Andreas Johansson · Chief Executive Officer
Senior IT management leader with 25 years of experience in Cloud, Security, and Datacenter infrastructure.
The Detection Window
Between initial compromise and encryption, ransomware attackers spend 3 to 21 days inside your environment — moving laterally, escalating privileges, exfiltrating data, and preparing for the final encryption payload. This dwell time is your detection window.
Every hour of earlier detection reduces damage. Catching an attacker on day 2 of a 14-day attack means containing a single compromised account rather than recovering an entire encrypted network. The difference in business impact is orders of magnitude.
Pre-Encryption Warning Signs
Credential Abuse Indicators
- Impossible travel authentication. The same account authenticating from two geographically distant locations within an impossible timeframe. This indicates stolen credentials being used by an attacker.
- Service account anomalies. Service accounts performing interactive logins, accessing systems they don't normally access, or authenticating at unusual times.
- Privilege escalation patterns. Standard user accounts suddenly gaining admin privileges. New accounts created with elevated permissions. Kerberoasting activity (requesting TGS tickets for service accounts).
- Failed authentication spikes. Sudden increases in failed logins across multiple accounts may indicate password spraying or brute-force attempts.
Lateral Movement Indicators
- PsExec and remote execution tools. PsExec, WMI remote execution, and PowerShell remoting between workstations or from workstations to servers. In most environments, workstations don't execute commands on other workstations.
- SMB traffic anomalies. Unusual SMB connections between systems that don't normally communicate. Ransomware uses SMB to spread across network shares.
- RDP internal connections. Internal RDP sessions between unexpected systems — especially from compromised workstations to servers.
- Mimikatz and credential dumping. Processes accessing LSASS memory or performing credential dumping operations.
Pre-Encryption Activity
- Shadow copy deletion. Attempts to delete Volume Shadow Service (VSS) copies using vssadmin or wmic. This is a near-certain indicator of imminent encryption — attackers delete recovery points before deploying ransomware.
- Backup tampering. Unauthorized access to backup systems, deletion of backup jobs, or modification of backup configurations.
- Security tool tampering. Attempts to disable or uninstall EDR, antivirus, or monitoring agents. Modification of Windows Defender settings. Disabling event logging.
- Suspicious scheduled tasks. New scheduled tasks created across multiple systems — often used to deploy the encryption payload simultaneously.
Data Exfiltration Indicators
- Unusual outbound data volumes. Large data transfers to external destinations — especially cloud storage (Mega, OneDrive, Google Drive) or unfamiliar IP addresses.
- DNS anomalies. Queries to newly registered domains, DNS tunneling patterns, or communication with known command-and-control infrastructure.
- Archive creation. Creation of large ZIP, 7z, or RAR files on servers containing sensitive data — attackers package data before exfiltrating.
Detection Technologies
- EDR (Endpoint Detection and Response). Essential for ransomware detection. EDR monitors process execution, file access, registry changes, and network connections at the endpoint level. Modern EDR detects ransomware behavioral patterns and can automatically isolate compromised systems.
- NDR (Network Detection and Response). Monitors network traffic for lateral movement, C2 communication, data exfiltration, and protocol anomalies. NDR provides visibility that endpoint-only monitoring misses.
- SIEM/Log Analysis. Correlates events across endpoints, network, identity, and cloud to detect multi-stage attack patterns. Log analysis connects individual indicators into attack narratives.
- UEBA (User and Entity Behavior Analytics). Baselines normal behavior and alerts on deviations. Particularly effective at detecting credential abuse, insider threats, and account compromise.
Building a Ransomware Detection Strategy
- Deploy EDR on all endpoints — non-negotiable baseline detection
- Enable comprehensive logging — authentication logs, PowerShell logs, security event logs, DNS logs
- Implement behavioral monitoring — detect anomalies in user and system behavior
- Monitor for known indicators — subscribe to threat intelligence feeds with ransomware IOCs
- Ensure 24/7 coverage — attacks happen outside business hours; detection must be continuous
How SeqOps fits
Ransomware usually starts with a known weakness: an unpatched server, an exposed service or a misconfigured cloud account. SeqOps finds these across your cloud and servers and ranks them so you can close the most dangerous ones first. It doesn't detect or stop an attack in progress.