Jean-Pierre LESUEUR
Lead Developer / Malware Researcher at Phrozen

With over 15 years of experience in Information Technology, I am a seasoned Security Researcher, Penetration Tester and Malware Researcher/Reverse Engineer. My expertise extends to development, proficient in languages such as C#, Python, Pascal/Delphi, and Assembly x86. In 2014, I founded PHROZEN, a venture dedicated to creating innovative cybersecurity solutions. My commitment lies in safeguarding our digital future, continuously advancing in knowledge and developing cutting-edge security measures.


Contributed Techniques
Contributed Code Snippets
Technique Language Creation Date
Reflective DLL injection Delphi 3 months
SMB / Named Pipes Delphi 5 months, 3 weeks
SMB / Named Pipes C# 5 months, 4 weeks
Right-to-Left Override (RLO) Extension Spoofing PowerShell 6 months, 3 weeks
C2 via FTP(S) Delphi 8 months, 2 weeks
C2 via FTP(S) C# 8 months, 2 weeks
Shortcut Hiding Python 1 year, 2 months
APC injection Delphi 1 year, 5 months
APC injection Delphi 1 year, 5 months
Indicator Removal: Timestomp C# 1 year, 6 months
Process Hollowing, RunPE Delphi 1 year, 8 months
Checking Mouse Activity Delphi 1 year, 8 months
DLL Injection via CreateRemoteThread and LoadLibrary Delphi 1 year, 8 months
ProcEnvInjection - Remote code injection by abusing process environment strings Delphi 1 year, 8 months
NtQueryInformationProcess C# 1 year, 8 months
File Melt C# 1 year, 8 months
NtQueryInformationProcess Delphi 1 year, 8 months
Detecting Mac Address C# 1 year, 8 months
File Melt Delphi 3 years
Detecting Active Services Delphi 3 years
NTFS Files Attributes Delphi 3 years, 2 months
Code Cave Python 3 years, 3 months
NtQueryObject Delphi 3 years, 4 months
NtSetInformationThread Delphi 3 years, 5 months
IsDebuggerPresent Delphi 3 years, 5 months
NtSetDebugFilterState Delphi 3 years, 5 months
OutputDebugString Delphi 3 years, 5 months
SuspendThread Delphi 3 years, 5 months
Detecting Window with FindWindow API Delphi 3 years, 5 months
Detecting Window with FindWindow API Python 3 years, 5 months
IsDebugged Flag Delphi 3 years, 6 months