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

pgrep Command in Linux: Find and Filter Running Processes

The pgrep command in Linux finds the PIDs of running processes based on a name or other…

2 hours ago

unlink Command in Linux: Remove a Single File or Symlink

The unlink command in Linux removes a single file by deleting its directory entry. It is a…

2 hours ago

How to Check Open Ports in Linux: nmap, netcat, and Bash

When troubleshooting a network connection or configuring a firewall, the first question is whether a…

3 hours ago

ifconfig Command in Linux: Configure Network Interfaces

The ifconfig command in Linux displays and configures network interfaces. It can assign IP addresses, bring interfaces…

3 hours ago

groupdel Command in Linux: Remove a Group and Audit Files

The groupdel command in Linux removes a group from the system. It deletes the group's entry from /etc/group and /etc/gshadow,…

1 day ago

wc Command in Linux: Count Lines, Words, Characters, and Bytes

The wc command in Linux counts lines, words, characters, and bytes in files or standard input. It…

1 day ago