Platform
Security & Compliance Automation Platform
UnderDefense MAXI is the solution to day-to-day cybersecurity problems of IT leaders and teams. It builds your 24/7 business protection together with you on the driver’s seat.
UnderDefense MAXI Platform
UnderDefense Secures Top Honor at the 2025 Global Infosec Awards
We’re proud of being a winner at the 2025 Global Infosec Awards…
Our AI
10-Point AWS Security Checklist for Executives
Quickly assess your cloud security posture with this executive-ready checklist covering IAM, monitoring, and compliance essentials.
Anti-Phishing Playbook
Your free PDF guide to spotting and stopping phishing attacks before they reach your team or data.
Services
24/7 Threat Detection & MAXImum Responsiveness
Our human-led MDR service combines expert insight and automation and AI for fast, precise threat response. Get full context in 2 minutes and cut MTTC to 15, staying ahead of ransomware and other attacks.
Calculate your MDR price
Pay only for the services you actually need, with no hidden costs.
Solutions
10-Point AWS Security Checklist for Executives
Quickly assess your cloud security posture with this executive-ready checklist covering IAM, monitoring, and compliance essentials.
Anti-Phishing Playbook
Your free PDF guide to spotting and stopping phishing attacks before they reach your team or data.
Company
Spot threats faster and respond smarter than tools alone
24/7 MDR and SOC services led by award-winning security experts. We act as an extension to your team or as a fully remote team, providing detailed threat insights and actionable responses to secure your environment immediately.
UnderDefense is an AWS Partner
We’re excited to announce that UnderDefense is now an AWS partner and available on AWS Marketplace…
Resources
Managed SOC at Your Service
Augment your SOC with 24/7 monitoring, threat detection, and expert response—without the overhead. Integrated with your existing tools, our SOCaaS stops attacks before they cause harm.
Managed SIEM Pricing Guide
Download a clear, practical overview of Managed SIEM pricing, featuring detailed breakdowns by service type, pricing model, real-world pros and cons, and key cost factors.
Partners
Managed SOC at Your Service
Augment your SOC with 24/7 monitoring, threat detection, and expert response—without the overhead. Integrated with your existing tools, our SOCaaS stops attacks before they cause harm.
Managed SIEM Pricing Guide
Download a clear, practical overview of Managed SIEM pricing, featuring detailed breakdowns by service type, pricing model, real-world pros and cons, and key cost factors.
GD LockerSec ransomware recovery team on standby
GD LockerSec is an emerging ransomware group active in 2024–2025, operating a RaaS model with a focus on unprotected or under-monitored SMB environments across Europe and North America. Isolate affected systems immediately and engage UnderDefense's incident response team — do not attempt recovery or negotiation without expert guidance.
Average Mttc
Ransom-Free recovery rate
Avoided in ransom
Global availability
Systems restored
IR experts
Ransomware cases resolved
IR experience
Do NOT attempt any self-remediation, as it can trigger further encryption and destroy recovery points. Instead, follow these steps:
Contact us now for urgent ransomware response assistance, 24/7
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Accomplishments and recognitions, demonstrating our commitment to excellence and innovation.
Momentum Leader in MDR
Best Support in MDR & IR
Managed Detection and Response (MDR)
Top Cybersecurity Company 2025
Best Managed Detection and Response Service
#4 of 184 teams Splunk Boss of the SOC
Best Of Cybersecurity Awards for Q1 2025
AWS Partner
Splunk Manage Premier Partner
Like a crime scene, a ransomware attack must be preserved — tampering with encrypted files, attempting self-recovery, or engaging with attackers can destroy critical evidence and reduce your chances of recovery.
Taking the right steps in the first moments after a GD LockerSec attack can make a huge difference and help you make a full recovery. Request 24/7 GD LockerSec ransomware recovery services to decrypt your data and maximize your chances of restoring operations.
GD LockerSec infections display .gdlocker or .lockersec file extensions and ransom notes named LOCKERSEC_README.txt or GD_NOTICE.txt. Initial compromise traces to standard phishing and credential theft vectors. Standard ransomware behavior: AES-256 encryption and data exfiltration.
AES-256-CBC with RSA-2048 wrapping.
RaaS with affiliate recruitment. Operators maintain malware, leak site, and payment infrastructure.
Dual extortion: encryption plus data publication. Standard leak site, victim names, data samples, 7-day countdown.
Windows-primary.
LOCKERSEC_README.txt or GD_NOTICE.txt with contact information.
No decryption tool available.
File Extensions
.gdlocker, .lockersec, .gd_locked
Ransom Note Filenames
LOCKERSEC_README.txt, GD_NOTICE.txt, GD_RESTORE.txt
GD LockerSec Hashes
Limited samples. Process names: lockersec.exe, gdlocker.exe.
GD LockerSec Tools
– EDR Disabling: Windows Defender GPO
– Credential Dumping: Mimikatz, registry hives
– Reconnaissance: Network enumeration
– Exfiltration: Rclone, FTP
– Lateral Movement: Pass-the-Hash, SMB
– Malware: Standard delivery trojans
Most Common Red Flag
PowerShell script execution, Rclone syncing, service creation with unusual names.
Attack vector | % of GD LockerSec incidents | Notes |
Phishing | 50% | Credential stealer |
RDP Brute Force | 35% | Weak credentials |
Unpatched Apps | 15% | Vulnerabilities |
2–5 documented victims. Ransom demands: $25K–$400K. Payment rate: 15–25%.
Eliminate attacker access: revoke credentials, remove persistence, restore from backups.
Recovery depends on backup strategy. Organizations with backups recover in 1–5 days.
Documented demands: $25,000–$400,000. Average settlement: $50,000–$150,000.
10 reasons why you should choose the UnderDefense ransomware recovery consulting services:
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GD LockerSec is an emerging RaaS operation (2024–2025) using AES-256-CBC encryption. Standard dual-extortion tactics.
Multiple “LockerSec” variants exist (GD LockerSec, standard LockerSec). Attribution unclear; may be unrelated operators using similar branding.
Mid-market enterprises across finance, manufacturing, healthcare. Opportunistic targeting.
No public tool exists.
Data publication within 7 days.
1) Email security; 2) Patch applications; 3) MFA; 4) EDR; 5) Offline backups; 6) Security audits.
1) Isolate systems; 2) Revoke credentials; 3) Scan for backdoors; 4) Preserve evidence; 5) Notify FBI; 6) Verify backups; 7) Begin recovery; 8) Monitor for re-compromise; 9) Post-incident audit.
The RaaS market sees branding competition. Multiple groups adopt similar names (LockerSec variants, “Locker” families) to leverage brand recognition or claim lineage. This complicates attribution and victim identification.
Minor emerging groups pose lower direct risk than established operations but contribute to overall threat landscape noise. Organizations should treat emerging groups as equivalent to established threats from EDR/backup perspective.
