T0826: Loss of Availability
Adversaries may attempt to disrupt essential components or systems to prevent owner and operator from delivering products or services. [1] [2] [3]
Adversaries may leverage malware to delete or encrypt critical data on HMIs, workstations, or databases.
In the 2021 Colonial Pipeline ransomware incident, pipeline operations were temporally halted on May 7th and were not fully restarted until May 12th. [4]
Security context for executives and security teams
T0826: Loss of Availability describes Adversaries may attempt to disrupt essential components or systems to prevent owner and operator from delivering products or services. (Citation: Corero) (Citation: Michael J. Assante and Robert M. Lee) (Citation: Tyson Macaulay) Adversaries may leverage malware to delete or encrypt critical data on HMIs, workstations, or databases. In the 2021 Colonial Pipeline ransomware incident, pipeline operations were temporally halted on May 7th and were not fully restarted until May 12th. (Citation: Colonial Pipeline Compan...
Executive priority
T0826: Loss of Availability is an official MITRE ATT&CK technique. Glexia treats it as defensive behavior context for prioritizing monitoring, control validation, and response planning without using the object by itself as an attribution claim.
Technical view
Security teams should validate T0826: Loss of Availability by reviewing the official ATT&CK relationships, mapped tactics (impact), supported platforms (None), and available local telemetry before making detection or mitigation decisions.
Likely telemetry
- Official ATT&CK relationships and object metadata
Detection direction
- Validate whether T0826: Loss of Availability appears in your detection coverage and tabletop scenarios.
- Use the object to align executive risk language with SOC, incident response, and detection engineering work.
- Do not treat ATT&CK relationship context as attribution without corroborating evidence.
Mitigation priorities
- Map the object to existing controls and identify missing telemetry or response ownership.
- Prioritize mitigations that reduce exposure on the listed platforms and tactics.
- Review adjacent ATT&CK relationships before changing policy, detections, or reporting language.
Additional notes and limits
Baseline Glexia take generated from the official MITRE ATT&CK STIX object, source hash, tactics, platforms, and detection fields. It is safe to replace with a richer model-generated take for the same source hash later.
This baseline take is source-grounded and schema-validated, but it does not include environment-specific telemetry, incident evidence, or threat-intelligence corroboration.
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Loss of Availability
Adversaries may attempt to disrupt essential components or systems to prevent owner and operator from delivering products or services. [1] [2] [3]
Adversaries may leverage malware to delete or encrypt critical data on HMIs, workstations, or databases.
In the 2021 Colonial Pipeline ransomware incident, pipeline operations were temporally halted on May 7th and were not fully restarted until May 12th. [4]
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.
Groups, software, and campaigns
S0608: Conficker
C0041: FrostyGoop Incident
FrostyGoop Incident took place in January 2024 against a municipal district heating company in Ukraine. Following initial access via likely exploitation of external facing services, FrostyGoop was used to manipulate ENCO control systems via legitimate Modbus commands to impact the delivery of heating services to Ukrainian civilians.[1][2]
C0028: 2015 Ukraine Electric Power Attack
2015 Ukraine Electric Power Attack was a Sandworm Team campaign during which they used BlackEnergy (specifically BlackEnergy3) and KillDisk to target and disrupt transmission and distribution substations within the Ukrainian power grid. This campaign was the first major public attack conducted against the Ukrainian power grid by Sandworm Team.
C0031: Unitronics Defacement Campaign
The Unitronics Defacement Campaign was a collection of intrusions across multiple sectors by the CyberAv3ngers, where threat actors engaged in a seemingly opportunistic and global targeting and defacement of Unitronics Vision Series Programmable Logic Controller (PLC) with Human-Machine Interface (HMI). The sectors that these PLCs can be commonly found in are water and wastewater, energy, food and beverage manufacturing, and healthcare. The most notable feature of this attack was the defacement of the PLCs' HMIs.[1][2]
All related ATT&CK context
Mitigation direction
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.
Imported snapshots across ATT&CK releases(2)
| Release | Bundle imported | Object version | Modified | Status | Raw hash |
|---|---|---|---|---|---|
| 19.2 | 1.0 | Current bundle | ef1a1b8100a0… | ||
| 19.1 | 1.0 | Older bundle | ef1a1b8100a0… |
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.
External references and citations
MITRE external references are preserved separately from Glexia analysis so citations remain traceable to their original source records.
- [1]Corero
Corero Industrial Control System (ICS) Security Retrieved. 2019/11/04
Open source URL - [2]Michael J. Assante and Robert M. Lee
Michael J. Assante and Robert M. Lee SANS Industrial Control System (ICS) Security; The Industrial Control System Cyber Kill Chain Retrieved 2024/11/25
Open source URL - [3]Tyson Macaulay
Tyson Macaulay Michael J. Assante and Robert M. Lee Corero Industrial Control System (ICS) Security Retrieved. 2019/11/04 The Industrial Control System Cyber Kill Chain Retrieved. 2019/11/04 RIoT Control: Understanding and Managing Risks and the Internet of Things Retrieved. 2019/11/04
Open source URL - [4]Colonial Pipeline Company May 2021
Colonial Pipeline Company 2021, May Media Statement Update: Colonial Pipeline System Disruption Retrieved. 2021/10/08
Open source URL - [5]mitre-attackT0826Open source URL
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