Published Wednesday, July 15, 2026 at 06:15 PM PT

<strong>CISA ALERTS: INTERLOCK RANSOMWARE VARIANT POSES CROSS-PLATFORM THREAT</strong>

BLUF: CISA and FBI have issued joint advisory on Interlock ransomware, a financially motivated threat with encryptors targeting both Windows and Linux systems. Organizations should review indicators of compromise and implement defensive measures outlined in the #StopRansomware advisory. No immediate zero-day or active mass exploitation reported at this time.

DETAILS:

  • Interlock is a financially motivated ransomware variant with confirmed encryptors designed for Windows and Linux operating systems
  • FBI has documented Interlock activity and TTPs; advisory includes indicators of compromise (IOCs) for network defense
  • This advisory is part of CISA’s ongoing #StopRansomware campaign to provide defenders with historical and recent threat actor behavior patterns
  • Cross-platform capability indicates potential targeting of both enterprise endpoints and server infrastructure
  • Specific current campaign scope and victim count are not detailed in available advisory summary

IMPACT:

Organizations running Windows or Linux environments may be at risk. The cross-platform nature suggests Interlock operators may target mixed IT environments, including cloud infrastructure and on-premises systems. Critical infrastructure, utilities, and commercial enterprises should be considered potential targets given financially motivated actor profile.

RECOMMENDED ACTIONS:

  • Review CISA’s full #StopRansomware: Interlock advisory for complete IOC list and TTP documentation
  • Implement network detection rules based on provided indicators
  • Audit backup systems and test recovery procedures
  • Verify endpoint detection and response (EDR) coverage on both Windows and Linux assets
  • Enforce principle of least privilege and segment network access
  • Enable logging on remote access and administrative tools

SOURCES:

CISA #StopRansomware Advisory; FBI Cyber Division

NOTE: Full advisory details remain incomplete in available summary. Organizations should access complete CISA advisory at cisa.gov for comprehensive IOC list and technical indicators.