tfMITRE ATT&CK sub-technique

JamPlus T1127.003

sub-technique of T1127 Trusted Developer Utilities Proxy Execution

Tactics: Execution, Stealth
Platform: Windows
Version: 2.0
Created: 21 March 2025
Last modified: 12 May 2026

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]

ReconResource DevInitial AccessExecutionPersistencePriv EscStealthDef ImpairmentCred AccessDiscoveryLateral MoveCollectionC2ExfiltrationImpact

Threat groupsNone recorded

Threat groupsNone recorded · 29% of ATT&CK techniques have none either.

CampaignsNone recorded

CampaignsNone recorded · 54% of ATT&CK techniques have none either.

Tools & malwareNone recorded

Tools & malwareNone recorded · 29% of ATT&CK techniques have none either.

Detection rulesNone recorded

Detection rulesNone recorded · 33% of ATT&CK techniques have none either.

Offense vs defense T1127.003

Is defensive coverage keeping up with adversary use? Eight counts, each ranked against all 697 ATT&CK techniques. Attack sits left, defense right, so a shape leaning left means adversaries are better documented here than defenders are equipped. Hover any spoke for its percentile and the share of techniques that have more. The timeline below shows when each side arrived.

JamPlus detection strategy DET0585

MITRE names one behaviour worth catching for this technique and breaks it into 1 analytic, one per platform. Each carries the log sources it needs and the fields you tune per environment.

Behavior-chain detection strategy for T1127.003 Trusted Developer Utilities Proxy Execution: JamPlus (Windows)

Enterprise

1 platform

AN1610 · Windows

Abuse of JamPlus.exe to launch malicious payloads via crafted .jam files, resulting in abnormal process creation, command execution, or artifact generation outside of standard development workflows.

Log sources

The data this analytic draws on. You do not need every component — each one you already collect covers part of it. Each links to its ATT&CK record.

Data component	Name	Channel
Process CreationDC0032	WinEventLog:Security	EventCode=4688
Process MetadataDC0034	WinEventLog:Microsoft-Windows-CodeIntegrity/Operational	Unsigned or untrusted modules loaded during JamPlus.exe runtime
File CreationDC0039	WinEventLog:Sysmon	EventCode=11
Network Connection CreationDC0082	WinEventLog:Sysmon	EventCode=3, 22

Tunable fields

MITRE calls these the analytic’s mutable elements: the thresholds and filters you set for your own environment.

Field	What you tune
TimeWindow	Correlation time window (e.g., 0–30 minutes) for JamPlus.exe execution, child processes, and file/network events.
AllowedBuildHosts	Known developer systems where JamPlus.exe usage is expected; alerts are raised if executed elsewhere.
SuspiciousChildList	Child processes considered anomalous (e.g., PowerShell, cmd, wscript) when spawned by JamPlus.exe.
RarePathRegex	Regex patterns for non-standard or user-writable paths where JamPlus.exe drops artifacts.

JamPlus detections T1127.003

No detection rules are mapped to this technique yet.

None recorded— 33% of ATT&CK techniques have none either

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