Interlock Ransomware

Interlock Ransomware is a ransomware operation attributed to eCrime, active since 2024. Ransomware targeting FreeBSD and critical infrastructure. Key capabilities include: FreeBSD encryptor, ClickFix delivery, healthcare targeting.

Overview & Operations

Ransomware targeting FreeBSD and critical infrastructure. The group has been active since 2024 and operates as part of the broader ransomware-as-a-service ecosystem. Notable technical characteristics include: FreeBSD encryptor, ClickFix delivery, healthcare targeting.

Ransomware Threat

Interlock Ransomware employs double extortion tactics — encrypting victim data while simultaneously exfiltrating sensitive information for leverage. Organizations that refuse to pay face public data exposure on the group's leak site.

Operator: eCrime
Active since: 2024
Tooling: FreeBSD encryptor, ClickFix delivery, healthcare targeting
Extortion model: Double extortion (encryption + data leak)

Tactics, Techniques & Procedures

Interlock operators typically gain initial access through phishing, exploiting public-facing applications (VPN, RDP, Exchange), or purchasing access from initial access brokers (IABs). Post-compromise, they deploy Cobalt Strike or similar C2 frameworks for lateral movement before deploying the ransomware payload.

Initial access: Phishing, vulnerability exploitation, RDP brute force, IAB purchases T1566.001 T1190
Execution: PowerShell, WMI, PsExec for payload deployment T1059.001
Persistence: Scheduled tasks, service creation, registry modifications T1053.005
Defense evasion: Security tool tampering, Safe Mode exploitation, BYOVD T1562.001
Lateral movement: RDP, SMB, WMI, admin shares T1021.002
Exfiltration: Custom exfiltration tools, cloud storage, Rclone T1567
Impact: File encryption with custom encryptor T1486

MITRE ATT&CK Mapping

Tactic	Technique	Usage
Initial Access	T1190 Exploit Public-Facing App	VPN/RDP/Exchange exploitation
Execution	T1059.001 PowerShell	Post-exploitation scripting
Persistence	T1053.005 Scheduled Task	Persistence mechanism
Defense Evasion	T1562.001 Disable Security Tools	EDR/AV tampering
Credential Access	T1003.001 LSASS Memory	Credential dumping
Lateral Movement	T1021.002 SMB/Admin Shares	Network propagation
Exfiltration	T1567 Exfil Over Web Service	Data theft before encryption
Impact	T1486 Data Encrypted for Impact	Ransomware deployment

Detection & Defense

Backup strategy: Maintain offline, immutable backups with tested restoration procedures
Network segmentation: Limit lateral movement paths between critical systems
EDR deployment: Behavioral detection for ransomware indicators (mass file modification, shadow copy deletion)
MFA enforcement: Protect RDP, VPN, and admin portals with phishing-resistant MFA
Patch management: Prioritize VPN, Exchange, and remote access vulnerabilities
Threat intelligence: Monitor for Interlock IOCs and dark web activity

Protect Against Interlock Ransomware

Mjolnir Security provides ransomware prevention, detection, and response services against Interlock Ransomware and similar threats.

Ransomware DefenseIncident ResponseThreat HuntingMDR ServicesBackup AssessmentTabletop Exercises

Ransomware Readiness Assessment Evaluate your organization's resilience against Interlock and similar ransomware operations with gap analysis and remediation recommendations.
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Written by: Mjolnir Security  |  Published: December 28, 2025