Blue Locker Ransomware
By |Last Updated: August 14th, 2025|3 min read|Categories: Threats|

Contents

Threat Intelligence Brief

Focus: Blue Locker Ransomware
Sector: Government / Education / Technology

Understanding Blue Locker

Blue Locker is a high‑impact ransomware strain that targets Windows-based endpoints such as desktops, laptops, servers, and connected storage systems. It encrypts files with a “.blue” extension (e.g. file.doc.blue) and leaves a restore_file.txt ransom note in each folder, instructing victims to contact the attackers (via ProtonMail) in exchange for a decryption key. The malware is capable of disabling antivirus software, conducting lateral movement, and exfiltrating sensitive data while spreading across networks.

View and download Threat Intelligence Brief in PDF format

Threat Landscape in Pakistan

NCERT has issued a high‑priority advisory to 39 government ministries and institutions, warning of a “severe risk” stemming from active Blue Locker operations. The alert follows confirmed attacks on entities such as Pakistan Petroleum Limited (PPL), whose IT infrastructure was significantly disrupted, with the incident resulting in encrypted servers, backups deleted, and financial operations suspended for days.  

Blue Locker actors are observed to use trojanized downloads, phishing emails, compromised websites, and unsecured file‑sharing platforms to distribute the malware.

How BlackFog Counters Blue Locker Ransomware

Real-Time Data Protection

BlackFog’s anti data exfiltration technology (ADX) prevents outbound data transfers, even those initiated during ransomware encryption processes, protecting data even if encryption begins.

Behavioral & Process Anomaly Detection

Sophisticated behavioral AI flags abnormal file renaming (e.g., .blue suffix additions), scheduled deletion of shadow copies, and mass file encryption events, enabling immediate containment.

BlackFog vs Blue Locker Ransomware

Threat Vector

Blue Locker Ransomware Tactic

BlackFog Countermeasure

File Encryption

.blue extension files and ransom note restore_file.txt

File activity detection + ADX-enabled blocking

Antivirus Evasion

Disables security tools

Real-time process monitoring stops illegal process execution

Lateral Spread

Network-wide propagation, backup deletion

Network segmentation and encrypted data channel monitoring

Attack Delivery

Phishing, downloads, compromised websites

Email/Web filter integration + user behavior alerts

Operational Impact

Shuts down financial and mission-critical systems

Rapid containment + process isolation framework

Advisory Recommendations from NCERT

  • Apply Security Patches Promptly to all systems and software.
  • Enable Multi-Factor Authentication (MFA) for all user accounts.
  • Strengthen Email and Web Filtering to block malicious content.
  • Train Staff on threat identification and avoidance of suspicious downloads.
  • Maintain Offline Backups of critical data and ensure backups are disconnected during incidents.
  • Preserve Forensic Artifacts to aid in investigations and incident response.

Why BlackFog?

In a cyber landscape increasingly shaped by human-operated threats, organizations need more than reactive alerts, they need 24/7 real-time prevention. BlackFog delivers exactly that.

With its unique anti data exfiltration (ADX) technology, AI based behavioral threat detection, and dynamic blocking capabilities, BlackFog helps organizations prevent breaches by ensuring unauthorized data never leaves the network.

For organizations with lean internal teams, BlackFog’s vCISO services provide expert leadership, streamlined incident response, and compliance-ready reporting, all tailored to the demands of that specific industry.

Ready to Learn More? 

Visit blackfog.com or contact us at sales@blackfog.com

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