CyberStack

MITRE ATT&CK / Techniques / T1053.002

Scheduled Task/Job: At

ID
T1053.002
Tactics
TA0002 Execution, TA0003 Persistence, TA0004 Privilege Escalation
Sub-technique of
T1053 Scheduled Task/Job
Platforms
Windows, Linux, macOS
Data sources
Scheduled Job Creation, Process Creation, File Modification, Command Execution
Source
attack.mitre.org
MITRE last modified
25 Oct 2025

Adversaries may abuse the at utility to perform task scheduling for initial or recurring execution of malicious code. The at utility exists as an executable within Windows, Linux, and macOS for scheduling tasks at a specified time and date. Although deprecated in favor of Scheduled Task's schtasks in Windows environments, using at requires that the Task Scheduler service be running, and the user to be logged on as a member of the local Administrators group. In addition to explicitly running the at command, adversaries may also schedule a task with at by directly leveraging the Windows Management Instrumentation Win32_ScheduledJob WMI class.[6]

On Linux and macOS, at may be invoked by the superuser as well as any users added to the at.allow file. If the at.allow file does not exist, the at.deny file is checked. Every username not listed in at.deny is allowed to invoke at. If the at.deny exists and is empty, global use of at is permitted. If neither file exists (which is often the baseline) only the superuser is allowed to use at.[7]

Adversaries may use at to execute programs at system startup or on a scheduled basis for Persistence. at can also be abused to conduct remote Execution as part of Lateral Movement and/or to run a process under the context of a specified account (such as SYSTEM).

In Linux environments, adversaries may also abuse at to break out of restricted environments by using a task to spawn an interactive system shell or to run system commands. Similarly, at may also be used for Privilege Escalation if the binary is allowed to run as superuser via sudo.[8]

Detection

Mitigations (4)

M1018 User Account Management

Limit privileges of user accounts and remediate Privilege Escalation vectors so only authorized administrators can create scheduled tasks on remote systems. In Linux environments, users account-level access to at can be managed using at.allow and at.deny files. Users listed in the at.allow are enabled to schedule actions using at, whereas users listed in at.deny file disabled from the utility.

M1026 Privileged Account Management

Configure the Increase Scheduling Priority option to only allow the Administrators group the rights to schedule a priority process. This can be configured through GPO: Computer Configuration > [Policies] > Windows Settings > Security Settings > Local Policies > User Rights Assignment: Increase scheduling priority. [1]

M1028 Operating System Configuration

Configure settings for scheduled tasks to force tasks to run under the context of the authenticated account instead of allowing them to run as SYSTEM. The associated Registry key is located at HKLM\SYSTEM\CurrentControlSet\Control\Lsa\SubmitControl. The setting can be configured through GPO: Computer Configuration > [Policies] > Windows Settings > Security Settings > Local Policies > Security Options: Domain Controller: Allow server operators to schedule tasks, set to disabled. [2]

M1047 Audit

Toolkits like the PowerSploit framework contain PowerUp modules that can be used to explore systems for permission weaknesses in scheduled tasks that could be used to escalate privileges. [3] Windows operating system also creates a registry key specifically associated with the creation of a scheduled task on the destination host at: Microsoft\Windows NT\CurrentVersion\Schedule\TaskCache\Tree\At1. [4] In Linux and macOS environments, scheduled tasks using at can be audited locally, or through centrally collected logging, using syslog, or auditd events from the host. [5]

Groups (3)

Software (3)

References

  1. TechNet Scheduling Priority
  2. TechNet Server Operator Scheduled Task
  3. Powersploit
  4. Secureworks - AT.exe Scheduled Task
  5. Kifarunix - Task Scheduling in Linux
  6. Malicious Life by Cybereason
  7. Linux at
  8. GTFObins at