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T1528 · credential-access · 2 actors · 4 correlated reports

Steal Application Access Token

Adversaries can steal application access tokens as a means of acquiring credentials to access remote systems and resources. Application access tokens are used to make authorized API requests on behalf of a user or service and are commonly used as a way to access resources in cloud and container-based applications and software-as-a-service (SaaS). Adversaries who steal account API tokens in cloud and containerized environments may be able to access data and perform actions with the permissions of these accounts, which can lead to privilege escalation and further compromise of the environment. For example, in Kubernetes environments, processes running inside a container may communicate with the Kubernetes API server using service account tokens. If a container is compromised, an adversary may be able to steal the container’s token and thereby gain access to Kubernetes API commands. Similarly, instances within continuous-development / continuous-integration (CI/CD) pipelines will often use API tokens to authenticate to other services for testing and deployment. If these pipelines are compromised, adversaries may be able to steal these tokens and leverage their privileges. Token theft can also occur through social engineering, in which case user action may be required to grant access. OAuth is one commonly implemented framework that issues tokens to users for access to systems. An application desiring access to cloud-based services or protected APIs can gain entry using OAuth 2.0 through a variety of authorization protocols. An example commonly-used sequence is Microsoft's Authorization Code Grant flow. An OAuth access token enables a third-party application to interact with resources containing user data in the ways requested by the application without obtaining user credentials. Adversaries can leverage OAuth authorization by constructing a malicious application designed to be granted access to resources with the target user's OAuth token. The adversary will need to complete registration of their application with the authorization server, for example Microsoft Identity Platform using Azure Portal, the Visual Studio IDE, the command-line interface, PowerShell, or REST API calls. Then, they can send a Spearphishing Link to the target user to entice them to grant access to the application. Once the OAuth access token is granted, the application can gain potentially long-term access to features of the user account through Application Access Token. Application access tokens may function within a limited lifetime, limiting how long an adversary can utilize the stolen token. However, in some cases, adversaries can also steal application refresh tokens, allowing them to obtain new access tokens without prompting the user.

Open detection, hunting, mitigation, and evidence workspace

Detection logic

Administrators should set up monitoring to trigger automatic alerts when policy criteria are met. For example, using a Cloud Access Security Broker (CASB), admins can create a “High severity app permissions” policy that generates alerts if apps request high severity permissions or send permissions requests for too many users. Security analysts can hunt for malicious apps using the tools available in their CASB, identity provider, or resource provider (depending on platform.) For example, they can filter for apps that are authorized by a small number of users, apps requesting high risk permissions, permissions incongruous with the app’s purpose, or apps with old “Last authorized” fields. A specific app can be investigated using an activity log displaying activities the app has performed, although some activities may be mis-logged as being performed by the user. App stores can be useful resources to further investigate suspicious apps. Administrators can set up a variety of logs and leverage audit tools to monitor actions that can be conducted as a result of OAuth 2.0 access. For instance, audit reports enable admins to identify privilege escalation actions such as role creations or policy modifications, which could be actions performed after initial access.

Observed actors

APT29
G0016 APT28
G0007

Correlated CTI and IR reports

CTI Research: Kubernetes & Cloud-Native Threat Landscape
1200km CTI repository · explicit report mention From Threat Intelligence to Detection: A Practitioner's Guide
1200km CTI repository · explicit report mention CTI Research Kubernetes Cloud Native Threat Landscape
1200km Medium · authored report mention From Threat Intelligence to Detection A Practitioner s Guide
1200km Medium · authored report mention

Cyber Knowledge context

Use these routes to move from the ATT&CK behavior into explanation, implementation, evidence handling, validation, and defensive operations. Relevance is generated from explicit identifiers/names and governed topic mappings; it is not attribution evidence.

MITRE mitigations

M1021 · Restrict Web-Based Content

Restricting web-based content involves enforcing policies and technologies that limit access to potentially malicious websites, unsafe downloads, and unauthorized browser behaviors. This can include URL filtering, download restrictions, script blocking, and extension control to protect against exploitation, phishing, and malware delivery. This mitigation can be implemented through the following measures: Deploy Web Proxy Filtering: - Use solutions to filter web traffic based on categories, reputation, and content types. - Enforce policies that block unsafe websites or file types at the gateway level. Enable DNS-Based Filtering: - Implement tools to restrict access to domains associated with malware or phishing campaigns. - Use public DNS filtering services to enhance protection. Enforce Content Security Policies (CSP): - Configure CSP headers on internal and external web applications to…

MITRE mitigation source

M1047 · Audit

Auditing is the process of recording activity and systematically reviewing and analyzing the activity and system configurations. The primary purpose of auditing is to detect anomalies and identify potential threats or weaknesses in the environment. Proper auditing configurations can also help to meet compliance requirements. The process of auditing encompasses regular analysis of user behaviors and system logs in support of proactive security measures. Auditing is applicable to all systems used within an organization, from the front door of a building to accessing a file on a fileserver. It is considered more critical for regulated industries such as, healthcare, finance and government where compliance requirements demand stringent tracking of user and system activates.This mitigation can be implemented through the following measures: System Audit: - Use Case: Regularly assess system co…

MITRE mitigation source

M1017 · User Training

User Training involves educating employees and contractors on recognizing, reporting, and preventing cyber threats that rely on human interaction, such as phishing, social engineering, and other manipulative techniques. Comprehensive training programs create a human firewall by empowering users to be an active component of the organization's cybersecurity defenses. This mitigation can be implemented through the following measures: Create Comprehensive Training Programs: - Design training modules tailored to the organization's risk profile, covering topics such as phishing, password management, and incident reporting. - Provide role-specific training for high-risk employees, such as helpdesk staff or executives. Use Simulated Exercises: - Conduct phishing simulations to measure user susceptibility and provide targeted follow-up training. - Run social engineering drills to evaluate employ…

MITRE mitigation source

M1018 · User Account Management

User Account Management involves implementing and enforcing policies for the lifecycle of user accounts, including creation, modification, and deactivation. Proper account management reduces the attack surface by limiting unauthorized access, managing account privileges, and ensuring accounts are used according to organizational policies. This mitigation can be implemented through the following measures: Enforcing the Principle of Least Privilege - Implementation: Assign users only the minimum permissions required to perform their job functions. Regularly audit accounts to ensure no excess permissions are granted. - Use Case: Reduces the risk of privilege escalation by ensuring accounts cannot perform unauthorized actions. Implementing Strong Password Policies - Implementation: Enforce password complexity requirements (e.g., length, character types). Require password expiration every 90…

MITRE mitigation source

MITRE detection strategies and analytics

DET0515 · Detection Strategy for T1528 - Steal Application Access Token

AN1423 · Analytic 1423 — Access and retrieval of container service account tokens followed by unauthorized API requests using those tokens to interact with the Kubernetes API server or internal services.
AN1424 · Analytic 1424 — Token retrieval from instance metadata endpoints such as AWS IMDS or Azure IMDS, followed by API usage using the obtained token from non-standard applications.
AN1425 · Analytic 1425 — Unusual OAuth app registration followed by user-granted OAuth tokens and subsequent high-privilege resource access via those tokens.
AN1426 · Analytic 1426 — Use of OAuth tokens by third-party apps to access user mail, calendar, or SharePoint resources where the token was granted recently or via spearphishing.
AN1427 · Analytic 1427 — Programmatic access to user content via stolen access tokens in platforms like Slack, GitHub, Google Workspace — especially from new IPs, apps, or excessive resource access.

MITRE detection source

Continue the investigation

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