Cyber security

ExecIT – Unveiling A Fileless Execution Technique Ith Undetectable DLL Shellcode

DLL Shellcode self-inyector/runner based on HWSyscalls, ideally thought to be executed with rundll32. May grant fileless execution if victim endpoint has access to attacker-controlled SMB share.

It is designed for use with rundll32 and has the potential to enable fileless execution when accessing an attacker-controlled SMB share.

The tool claims to be undetected by several EDR solutions but emphasizes ethical and lawful use

Usage

rundll32.exe ExecIT.dll, HelperFunc, <path_to_file>

Detection

Currently it is fully undetected across all EDRs tested (depending on the shellcode) as of this commit.

E.g., for Defender for Endpoint EDR:

Disclaimer

The information/files provided in this repository are strictly intended for educational and ethical purposes only.

The techniques and tools are intended to be used in a lawful and responsible manner, with the explicit consent of the target system’s owner.

Any unauthorized or malicious use of these techniques and tools is strictly prohibited and may result in legal consequences.

I am not responsible for any damages or legal issues that may arise from the misuse of the information provided.

Varshini

Varshini is a Cyber Security expert in Threat Analysis, Vulnerability Assessment, and Research. Passionate about staying ahead of emerging Threats and Technologies.

Recent Posts

Install MariaDB on Ubuntu 20.04: Setup and Admin Access

MariaDB is an open-source relational database management system. It was created by the original MySQL developers…

4 minutes ago

Best OSINT Tools for Investigating Corruption 2026: Public Records and Link Analysis

Corruption investigations need accuracy, patience, and strong evidence. In 2026, OSINT tools can help researchers,…

16 minutes ago

Best OSINT Tools for Private Investigators 2026: Legal People and Asset Research

Private investigators use OSINT to collect public information, verify identities, review business connections, check public…

34 minutes ago

Best OSINT Tools for Journalists 2026: Verify Sources, Images and Claims

Journalists use OSINT to verify public information before publishing. In 2026, misinformation, AI-generated images, fake…

12 hours ago

Install Docker on Ubuntu 20.04: Complete Step-by-Step Guide

Docker is an open-source platform that lets you package and run applications inside containers. Each container…

22 hours ago

Install PostgreSQL on Ubuntu: Database Setup and Admin Guide

PostgreSQL (often called Postgres) is an open-source relational database system. It supports advanced features like JSON…

23 hours ago