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MITRE ATT&CK® ICS Asset

A0018: Programmable Automation Controller (PAC)

A Programmable Automation Controller (PAC) is an embedded programmable control device. PACs are designed to enable automation applications across integrated software applications, peer controllers (e.g., PLC), Human Machine Interfaces, and other systems. PACs often include advanced features for process control, motion control, drive control, and vision applications. PACs are programmed using traditional process automation programming languages (IEC-61131) and sometimes languages such as C and C++ to support more advanced controls.

ICSA0018ICS AssetObject v1.1 Modified
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Glexia's Take

Analyst context for executives and security teams

Analyst confidence Medium

A Programmable Automation Controller is a high-value embedded control asset because it can coordinate automation across peer controllers, HMIs, software applications, and physical process functions such as process, motion, drive, and vision control. The ATT&CK relationships show many adversary behaviors targeting PACs, including program download/upload, controller tasking changes, I/O and parameter manipulation, alarm modification, discovery, network sniffing, denial of service, restart/shutdown, and firmware update mode abuse. For leaders, this means PAC security is not only an IT control issue; it is tied directly to process reliability, operator visibility, and safe response during abnormal conditions.

Executive priority

Treat PACs as operational resilience assets. Priority questions should include: which PACs support critical processes, who can program or modify them, whether program and parameter changes are approved and recoverable, and whether SOC/IR teams can distinguish legitimate engineering activity from suspicious controller interaction. Because ATT&CK provides no official detection text for this asset, organizations should not assume coverage from standard endpoint monitoring; evidence usually depends on OT network visibility, engineering workstation activity, controller state/change records, and process historian or alarm context.

Technical view

For SOC, detection engineering, and IR teams, validate monitoring around the behaviors ATT&CK relates to PACs: program upload/download, online edit, program append, tasking modification, parameter and I/O image changes, alarm setting changes, firmware update mode, restart/shutdown, DoS-like communication patterns, discovery, port/broadcast discovery, network sniffing indicators, and adversary-in-the-middle conditions. Since PACs are embedded assets and may be programmed with IEC-61131 languages and sometimes C/C++, coverage should focus on controller-facing communications, engineering tools/workstations, approved change windows, and deviations from normal process-control activity rather than relying only on host telemetry from the PAC itself.

Likely telemetry

  • OT network traffic to and from PACs, peer controllers, HMIs, and related control software
  • Engineering workstation and vendor programming software activity associated with upload, download, online edit, or append operations
  • Controller program, tasking, configuration, parameter, and I/O change records where available
  • PAC operating state indicators, including firmware update mode, stop/run states, restart, or shutdown events
  • OPC tags, historian data, PLC/PAC block information, and process state values referenced by monitoring workflows

Detection direction

  • Baseline legitimate engineering activity, including approved users, workstations, maintenance windows, and expected program-change workflows.
  • Alert on PAC program transfers, online edits, append operations, tasking changes, parameter changes, I/O manipulation, alarm-setting changes, and firmware update mode outside authorized change context.
  • Correlate controller-facing network activity with historian/process state and operator alarm context to reduce false positives from normal maintenance or commissioning work.
  • Tune discovery detections for OT realities: some broadcast discovery and vendor-tool enumeration may be legitimate, but new sources, unusual timing, or broad targeting of PACs should be reviewed.
  • Validate whether the SOC can see embedded-device communications at all; lack of endpoint telemetry on PACs is a common blind spot.

Mitigation priorities

  • Maintain an accurate inventory of PACs, their critical process roles, peer systems, and authorized engineering paths.
  • Restrict and review access to engineering workstations and software capable of PAC upload, download, online edit, append, tasking, parameter, I/O, alarm, restart, shutdown, or firmware-mode actions.
  • Implement formal change control and recovery readiness for PAC programs and configurations, including the ability to compare approved logic and settings against current device state.
  • Segment and monitor controller networks so PAC management and process-control traffic are limited to expected systems and observable to defenders.
  • Prioritize resilience controls for PACs supporting safety- or production-critical functions, including procedures for abnormal controller states such as update mode, stop state, restart, or loss of communications.
Analyst notes and limits

This object is an ICS asset, not a technique. The strongest decision value comes from the techniques ATT&CK lists as targeting PACs, which collectively show that PAC compromise or misuse can affect visibility, logic, configuration, communications, and availability of physical process control. Local engineering practices, vendor tooling, network architecture, and process criticality are required to turn this into precise detections and controls.

MITRE provides no official detection guidance, tactics, aliases, or mitigations for this asset in the supplied fields. The take is therefore based on the official PAC description and the supplied relationship context only. It does not assert active exploitation, actor attribution, specific vendor exposure, or guaranteed detection coverage.

Official MITRE ATT&CK definition

Programmable Automation Controller (PAC)

A Programmable Automation Controller (PAC) is an embedded programmable control device. PACs are designed to enable automation applications across integrated software applications, peer controllers (e.g., PLC), Human Machine Interfaces, and other systems. PACs often include advanced features for process control, motion control, drive control, and vision applications. PACs are programmed using traditional process automation programming languages (IEC-61131) and sometimes languages such as C and C++ to support more advanced controls.

View the same entry on attack.mitre.org (MITRE-hosted reference; in-page links above use the Glexia ATT&CK library.)

Glexia analysis

How security teams should use this page

Treat this object as behavior context, not an attribution claim. Validate the related groups, software, data sources, and mitigations against official ATT&CK relationships and your own telemetry before making control-coverage decisions.

ATT&CK relationship table

Techniques used

This mirrors the MITRE pattern of making group, software, campaign, and technique relationships scannable. Relationship notes come from mirrored ATT&CK relationship text when available.

60 rows
Domain ID Name Relationship / procedure
ICS T0878 Alarm Suppression Alarm Suppression targets this object.
ICS T0801 Monitor Process State Monitor Process State targets this object.
ICS T1695.003 Wi-Fi Sub-technique Wi-Fi targets this object.
ICS T0838 Modify Alarm Settings Modify Alarm Settings targets this object.
ICS T0866 Exploitation of Remote Services Exploitation of Remote Services targets this object.
ICS T0877 I/O Image I/O Image targets this object.
ICS T0871 Execution through API Execution through API targets this object.
ICS T0820 Exploitation for Evasion Exploitation for Evasion targets this object.
ICS T0846.002 Broadcast Discovery Sub-technique Broadcast Discovery targets this object.
ICS T0809 Data Destruction Data Destruction targets this object.
ICS T1693 Modify Firmware Modify Firmware targets this object.
ICS T0843 Program Download Program Download targets this object.
ICS T1691.002 Reporting Message Sub-technique Reporting Message targets this object.
ICS T1692.002 Reporting Message Sub-technique Reporting Message targets this object.
ICS T0890 Exploitation for Privilege Escalation Exploitation for Privilege Escalation targets this object.
ICS T0884 Connection Proxy Connection Proxy targets this object.
ICS T0846 Remote System Discovery Remote System Discovery targets this object.
ICS T1692.001 Command Message Sub-technique Command Message targets this object.
ICS T1695.001 Serial COM Sub-technique Serial COM targets this object.
ICS T0869 Standard Application Layer Protocol Standard Application Layer Protocol targets this object.
ICS T0843.002 Online Edit Sub-technique Online Edit targets this object.
ICS T0800 Activate Firmware Update Mode Activate Firmware Update Mode targets this object.
ICS T0816 Device Restart/Shutdown Device Restart/Shutdown targets this object.
ICS T0821 Modify Controller Tasking Modify Controller Tasking targets this object.
ICS T1693.002 Module Firmware Sub-technique Module Firmware targets this object.
ICS T1694 Insecure Credentials Insecure Credentials targets this object.
ICS T0830 Adversary-in-the-Middle Adversary-in-the-Middle targets this object.
ICS T0834 Native API Native API targets this object.
ICS T1691 Block Operational Technology Message Block Operational Technology Message targets this object.
ICS T0872 Indicator Removal on Host Indicator Removal on Host targets this object.
ICS T0862 Supply Chain Compromise Supply Chain Compromise targets this object.
ICS T0851 Rootkit Rootkit targets this object.
ICS T0814 Denial of Service Denial of Service targets this object.
ICS T1695.002 Ethernet Sub-technique Ethernet targets this object.
ICS T0848 Rogue Master Rogue Master targets this object.
ICS T0868 Detect Operating Mode Detect Operating Mode targets this object.
ICS T1695 Block Communications Block Communications targets this object.
ICS T1691.001 Command Message Sub-technique Command Message targets this object.
ICS T0847 Replication Through Removable Media Replication Through Removable Media targets this object.
ICS T0874 Hooking Hooking targets this object.
ICS T0892 Change Credential Change Credential targets this object.
ICS T0835 Manipulate I/O Image Manipulate I/O Image targets this object.
ICS T0802 Automated Collection Automated Collection targets this object.
ICS T0885 Commonly Used Port Commonly Used Port targets this object.
ICS T1692 Unauthorized Message Unauthorized Message targets this object.
ICS T0842 Network Sniffing Network Sniffing targets this object.
ICS T0836 Modify Parameter Modify Parameter targets this object.
ICS T0806 Brute Force I/O Brute Force I/O targets this object.
ICS T0843.001 Download All Sub-technique Download All targets this object.
ICS T0845 Program Upload Program Upload targets this object.
ICS T0846.003 Multicast Discovery Sub-technique Multicast Discovery targets this object.
ICS T0846.001 Port Scan Sub-technique Port Scan targets this object.
ICS T0840 Network Connection Enumeration Network Connection Enumeration targets this object.
ICS T1694.001 Default Credentials Sub-technique Default Credentials targets this object.
ICS T0888 Remote System Information Discovery Remote System Information Discovery targets this object.
ICS T0861 Point & Tag Identification Point & Tag Identification targets this object.
ICS T0859 Valid Accounts Valid Accounts targets this object.
ICS T0858 Change Operating Mode Change Operating Mode targets this object.
ICS T0843.003 Program Append Sub-technique Program Append targets this object.
ICS T0889 Modify Program Modify Program targets this object.
Relationship explorer

All related ATT&CK context

targets · Technique T0878: Alarm Suppression ICS targets · Technique T0801: Monitor Process State ICS targets · Technique T1695.003: Wi-Fi ICS targets · Technique T0838: Modify Alarm Settings ICS targets · Technique T0866: Exploitation of Remote Services ICS targets · Technique T0877: I/O Image ICS targets · Technique T0871: Execution through API ICS targets · Technique T0820: Exploitation for Evasion ICS targets · Technique T0846.002: Broadcast Discovery ICS targets · Technique T0809: Data Destruction ICS targets · Technique T1693: Modify Firmware ICS targets · Technique T0843: Program Download ICS targets · Technique T1691.002: Reporting Message ICS targets · Technique T1692.002: Reporting Message ICS targets · Technique T0890: Exploitation for Privilege Escalation ICS targets · Technique T0884: Connection Proxy ICS targets · Technique T0846: Remote System Discovery ICS targets · Technique T1692.001: Command Message ICS targets · Technique T1695.001: Serial COM ICS targets · Technique T0869: Standard Application Layer Protocol ICS targets · Technique T0843.002: Online Edit ICS targets · Technique T0800: Activate Firmware Update Mode ICS targets · Technique T0816: Device Restart/Shutdown ICS targets · Technique T0821: Modify Controller Tasking ICS
Change history

Object version and sync metadata

The fields below describe the current mirrored snapshot. When Glexia retains multiple ATT&CK source imports, you can open the table to compare the same object across releases (hashes and MITRE timestamps). For MITRE’s own release notes and roadmap, see ATT&CK resources — Updates .

ATT&CK release
19.1
Object version
1.1
Created
Modified
Raw hash
83b28c79ca54e05a...
Imported snapshots across ATT&CK releases (1)
Release Bundle imported Object version Modified Status Raw hash
19.1 1.1 Current bundle 83b28c79ca54…
Raw source

Mirrored ATT&CK source object

The raw object is retained through the mirrored ATT&CK source bundle and object hash. The raw endpoint returns the exact object from the mirrored bundle when available.

Open mirrored raw JSON Open MITRE-hosted copy
Source references

External references and citations

MITRE external references are preserved separately from Glexia analysis so citations remain traceable to their original source records.

  1. [1]
    mitre-attack A0018
    Open source URL
Source and licensing

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