Scheduled Task/Job
Sub-techniques (7)
Adversaries may abuse task scheduling functionality to facilitate initial or recurring execution of malicious code. Utilities exist within all major operating systems to schedule programs or scripts to be executed at a specified date and time. A task can also be scheduled on a remote system, provided the proper authentication is met (ex: RPC and file and printer sharing in Windows environments). Scheduling a task on a remote system typically may require being a member of an admin or otherwise privileged group on the remote system.(Citation: TechNet Task Scheduler Security) Adversaries may use task scheduling to execute programs at system startup or on a scheduled basis for persistence. These mechanisms can also be abused to run a process under the context of a specified account (such as one with elevated permissions/privileges). Similar to System Binary Proxy Execution, adversaries have also abused task scheduling to potentially mask one-time execution under a trusted system process.(Citation: ProofPoint Serpent)
Procedure Examples |
|
| Name | Description |
|---|---|
| StrifeWater |
StrifeWater has create a scheduled task named `Mozilla\Firefox Default Browser Agent 409046Z0FF4A39CB` for persistence.(Citation: Cybereason StrifeWater Feb 2022) |
| DEADEYE |
DEADEYE has used the scheduled tasks `\Microsoft\Windows\PLA\Server Manager Performance Monitor`, `\Microsoft\Windows\Ras\ManagerMobility`, `\Microsoft\Windows\WDI\SrvSetupResults`, and `\Microsoft\Windows\WDI\USOShared` to establish persistence.(Citation: Mandiant APT41) |
| Earth Lusca |
Earth Lusca used the command |
| Lokibot |
Lokibot's second stage DLL has set a timer using “timeSetEvent” to schedule its next execution.(Citation: Talos Lokibot Jan 2021) |
| Remsec |
Remsec schedules the execution one of its modules by creating a new scheduler task.(Citation: Kaspersky ProjectSauron Technical Analysis) |
Mitigations |
|
| Mitigation | Description |
|---|---|
| User Account Management |
Manage the creation, modification, use, and permissions associated to user accounts. |
| Operating System Configuration |
Make configuration changes related to the operating system or a common feature of the operating system that result in system hardening against techniques. |
| Restrict File and Directory Permissions |
Restrict access by setting directory and file permissions that are not specific to users or privileged accounts. |
| Privileged Account Management |
Manage the creation, modification, use, and permissions associated to privileged accounts, including SYSTEM and root. |
| Scheduled Task Mitigation |
Limit privileges of user accounts and remediate Privilege Escalation vectors so only authorized administrators can create scheduled tasks on remote systems. 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. (Citation: Powersploit)
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 |
| Audit |
Perform audits or scans of systems, permissions, insecure software, insecure configurations, etc. to identify potential weaknesses. |
Detection
Monitor scheduled task creation from common utilities using command-line invocation. Legitimate scheduled tasks may be created during installation of new software or through system administration functions. Look for changes to tasks that do not correlate with known software, patch cycles, etc. Suspicious program execution through scheduled tasks may show up as outlier processes that have not been seen before when compared against historical data. Data and events should not be viewed in isolation, but as part of a chain of behavior that could lead to other activities, such as network connections made for Command and Control, learning details about the environment through Discovery, and Lateral Movement.
References
- Microsoft. (2012, June 27). Using Software Restriction Policies and AppLocker Policies. Retrieved April 7, 2016.
- Corio, C., & Sayana, D. P. (2008, June). Application Lockdown with Software Restriction Policies. Retrieved November 18, 2014.
- NSA Information Assurance Directorate. (2014, August). Application Whitelisting Using Microsoft AppLocker. Retrieved March 31, 2016.
- Tomonaga, S. (2016, January 26). Windows Commands Abused by Attackers. Retrieved February 2, 2016.
- Beechey, J. (2010, December). Application Whitelisting: Panacea or Propaganda?. Retrieved November 18, 2014.
- Microsoft. (2005, January 21). Task Scheduler and security. Retrieved June 8, 2016.
- Campbell, B. et al. (2022, March 21). Serpent, No Swiping! New Backdoor Targets French Entities with Unique Attack Chain. Retrieved April 11, 2022.
- Cybereason Nocturnus. (2022, February 1). StrifeWater RAT: Iranian APT Moses Staff Adds New Trojan to Ransomware Operations. Retrieved August 15, 2022.
- Rufus Brown, Van Ta, Douglas Bienstock, Geoff Ackerman, John Wolfram. (2022, March 8). Does This Look Infected? A Summary of APT41 Targeting U.S. State Governments. Retrieved July 8, 2022.
- Microsoft. (2012, November 15). Domain controller: Allow server operators to schedule tasks. Retrieved December 18, 2017.
- Chen, J., et al. (2022). Delving Deep: An Analysis of Earth Lusca’s Operations. Retrieved July 1, 2022.
- Muhammad, I., Unterbrink, H.. (2021, January 6). A Deep Dive into Lokibot Infection Chain. Retrieved August 31, 2021.
- Microsoft. (2013, May 8). Increase scheduling priority. Retrieved December 18, 2017.
- PowerSploit. (n.d.). Retrieved December 4, 2014.
- Kaspersky Lab's Global Research & Analysis Team. (2016, August 9). The ProjectSauron APT. Technical Analysis. Retrieved August 17, 2016.
Связанные риски
Каталоги
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