Trusted Developer Utilities Proxy Execution: JamPlus

Adversaries may use JamPlus to proxy the execution of a malicious script. JamPlus is a build utility tool for code and data build systems. It works with several popular compilers and can be used for generating workspaces in code editors such as Visual Studio.[1]

Adversaries may abuse the JamPlus build utility to execute malicious scripts via a .jam file, which describes the build process and required dependencies. Because the malicious script is executed from a reputable developer tool, it may subvert application control security systems such as Smart App Control.[2][3]

ID: T1127.003
Sub-technique of:  T1127
Tactic: Defense Evasion
Platforms: Windows
Version: 1.0
Created: 21 March 2025
Last Modified: 17 April 2025

Mitigations

ID Mitigation Description
M1042 Disable or Remove Feature or Program

JamPlus may not be necessary within a given environment and should be removed if not used.

M1038 Execution Prevention

Consider blocking or restricting JamPlus if not required.

Detection

ID Data Source Data Component Detects
DS0009 Process Process Creation

Monitor for abnormal use of JamPlus, including the JamPlus Builder, that may be indicative of malicious use.

References