PsExec
A Sysinternals remote administration tool for executing processes on Windows systems without installing client software.
PsExec is a lightweight command-line utility from the Sysinternals suite that enables administrators to execute programs remotely on Windows systems. Developed by Microsoft Sysinternals, PsExec is widely used for systems administration, troubleshooting, automation, and large-scale environment management—but is also frequently abused by attackers due to its power and native trust within Windows environments.
PsExec operates by creating a temporary service on the target system and executing commands with the specified credentials, making it highly effective for remote execution without prior installation.
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What PsExec Does
PsExec allows users to run commands, scripts, and executables on remote Windows machines as if they were run locally. It supports interactive sessions, background execution, and running processes under alternate user accounts, including SYSTEM.
Because PsExec uses legitimate Windows APIs and administrative credentials, it blends seamlessly into enterprise environments, an attribute that makes it valuable for IT teams and attractive for threat actors.
PsExec is commonly observed in both legitimate administrative workflows and post-compromise lateral movement.
Key Features of PsExec
Remote Command Execution
Run executables, scripts, and commands on remote systems without installing an agent.
SYSTEM-Level Execution
Launch processes under the Local SYSTEM account for deep administrative tasks and diagnostics.
Interactive and Non-Interactive Sessions
Supports interactive consoles or silent background execution.
Credential-Based Authentication
Uses standard Windows authentication (local or domain credentials).
No Persistent Installation
Creates a temporary service that is removed after execution, minimizing system footprint.
Script and Automation Friendly
Easily integrated into batch scripts, PowerShell workflows, and administrative toolchains.
Native Windows Integration
Relies on SMB and Windows Service Control Manager, requiring no additional software.
Advanced Use Cases
Enterprise Systems Administration
Perform remote maintenance, software deployment, patch verification, and diagnostics at scale.
Incident Response and Containment
Execute forensic or remediation tools across multiple hosts during active incidents.
IT Operations and Automation
Trigger scripts and commands across servers and endpoints as part of operational workflows.
Red Team and Adversary Simulation
Emulate realistic attacker lateral movement techniques during security testing.
Post-Exploitation and Lateral Movement (Adversary Use)
Threat actors frequently use PsExec to move laterally after obtaining administrative credentials.
Latest Observations (as of 2026)
Key PsExec-related developments and trends include:
Continued inclusion of PsExec in modern Windows and Sysinternals distributions
Frequent detection of PsExec usage in ransomware and intrusion campaigns
Expanded EDR focus on detecting PsExec service creation and SMB-based execution
Increased use of PsExec alternatives by attackers due to improved monitoring
Ongoing relevance in legacy and modern Windows environments
PsExec itself has remained functionally stable, with changes primarily focused on compatibility and security hardening within Windows.
Why It Matters
PsExec represents a dual-use tool: indispensable for administrators, yet dangerous in the wrong hands. Its trusted status, simplicity, and power make it a common “living-off-the-land” binary used in real-world attacks.
For defenders, monitoring PsExec usage is critical for detecting lateral movement, credential abuse, and unauthorized remote execution. For administrators, it remains a powerful and efficient remote management utility when used responsibly.
Requirements and Platform Support
PsExec runs on:
Windows client and server operating systems
It requires:
Administrative credentials on the target system
SMB (TCP 445) connectivity
Windows Service Control Manager access
Official documentation and download:
https://learn.microsoft.com/sysinternals/downloads/psexec