Winexe

Overview

HackTool:Win32/Winexe (or simply `winexe`) is a legitimate, open-source GNU/Linux utility that allows users to execute commands remotely on Windows operating systems from a GNU/Linux host. It functions similarly to Microsoft's Sysinternals PsExec. However, because it facilitates remote execution, it is heavily weaponized by threat actors (particularly those operating from Linux-based C2 infrastructure or Kali Linux pivot machines) to achieve lateral movement and Remote Code Execution (RCE) on Windows targets (`T1569.002`).

Understanding Winexe (Living off the Land)
To an end-user, `winexe` execution is invisible. For a security operations center, the detection of `winexe` activity is a critical incident indicating that an attacker has compromised credentials and is actively moving laterally across the network from a Linux-based platform. Because the underlying protocols (SMB/RPC) are legitimate, distinguishing malicious `winexe` use from legitimate administration (if Linux admins manage Windows boxes) requires deep behavioral analysis.

Execution and Lateral Movement Mechanics
An attacker requires valid Windows credentials (or a password hash for Pass-the-Hash attacks) and network access to the target's SMB ports (TCP 139/445). From their Linux machine, they run a command like `winexe -U DOMAIN/Admin%Password //192.168.1.10 'cmd.exe'`. Winexe connects to the Windows target via SMB (`T1021.002`), authenticates, accesses the hidden `ADMIN$` share, and drops a small service executable (typically named `winexesvc.exe`). It creates and starts a Windows Service to run this executable (`T1543.003`), which then executes the requested command (e.g., `cmd.exe`) and pipes the output back to the Linux attacker over a named pipe.

Indicators of Compromise & Impact
The impact is total control over the targeted Windows host. Host-based IoCs are highly specific: EDR alerts for the creation and execution of the `winexesvc.exe` service (often running from `%SystemRoot%`), and Windows Event Log 7045 (A service was installed in the system) detailing the `winexesvc` installation. Network IoCs include inbound SMB traffic (TCP 445) originating from unusual Linux hosts (or VPN endpoints) followed immediately by RPC traffic and named pipe communication.

MITRE ATT&CK Techniques

Observed techniques used by this family, mapped to the MITRE ATT&CK framework:

Generated Detections (Boilerplate)

These YARA and Sigma rules are auto-generated based on the family name and aliases. They must be heavily tuned before deployment in a production environment.

YARA Rule

rule MALWARE_WIN_WINEXE {
    meta:
        description = "Detects Winexe (advanced_threat)"
        author = "SystemHelpdesk Boilerplate Generator"
        date = "2026-07-06"
    strings:
        $s1 = "winexe" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

Sigma Rule

title: Suspicious Winexe Activity
id: 02ade86c026cd9ce0fb930134708ce0e
status: experimental
description: Detects generic indicators of the winexe malware family.
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith:
            - '\cmd.exe'
            - '\powershell.exe'
        CommandLine|contains:
            - "*winexe*"
    condition: selection
level: medium

Containment & Response Steps

Ordered checklist for responders. Adapt to your environment and engage professional support for active incidents.

1. Isolate the targeted Windows machine and, crucially, identify and isolate the Linux host from which the `winexe` command originated.
2. Assume the credentials used by `winexe` are fully compromised and initiate an immediate, enterprise-wide password reset for that account.
3. Use EDR to hunt across the network for the presence of `winexesvc.exe` or Event ID 7045 related to `winexe` to map the extent of lateral movement.
4. Restrict SMB (TCP 445) communication between workstations; SMB should generally only flow between workstations and designated file servers/domain controllers.

What to Avoid

Common mistakes during response to this family that can destroy evidence, spread the infection, or worsen recovery.

1. Do not ignore `winexesvc.exe` detections assuming they are benign administrative activity unless you explicitly use Linux to manage Windows hosts in your environment.
2. Avoid leaving the `ADMIN$` share enabled if it is not strictly required for centralized management tools.

References & External Analysis

• Search "winexe" on VirusTotal (External Analysis)

Frequently Asked Questions

Related Families (Category: advanced_threat)

Explore other malware families in the same category:

• Mapsgory
• Dlassistant
• Prochack
• Runner
• Allinonekeylogger

Machine-readable

Get this profile as JSON: https://jordanricky1604-ship-it.github.io/malware-families-catalog/api/winexe.json

Ecosystem & Interactive Environments

This profile is part of the Malware Families Catalog, a public dataset of 2,899 malware families. The catalog is also published across our ecosystem: Hugging Face, Kaggle, Zenodo, Replit, StackBlitz, CodeSandbox, and CodePen.