Create or Modify System Process
Sub-techniques (4)
Adversaries may create or modify system-level processes to repeatedly execute malicious payloads as part of persistence. When operating systems boot up, they can start processes that perform background system functions. On Windows and Linux, these system processes are referred to as services.(Citation: TechNet Services) On macOS, launchd processes known as Launch Daemon and Launch Agent are run to finish system initialization and load user specific parameters.(Citation: AppleDocs Launch Agent Daemons) Adversaries may install new services, daemons, or agents that can be configured to execute at startup or a repeatable interval in order to establish persistence. Similarly, adversaries may modify existing services, daemons, or agents to achieve the same effect. Services, daemons, or agents may be created with administrator privileges but executed under root/SYSTEM privileges. Adversaries may leverage this functionality to create or modify system processes in order to escalate privileges.(Citation: OSX Malware Detection)
Procedure Examples |
|
| Name | Description |
|---|---|
| Exaramel for Linux |
Exaramel for Linux has a hardcoded location that it uses to achieve persistence if the startup system is Upstart or System V and it is running as root.(Citation: ANSSI Sandworm January 2021) |
| MiniDuke |
MiniDuke can create a process on a compromised host.(Citation: ESET Dukes October 2019) |
| FatDuke |
FatDuke has the ability to create a process.(Citation: ESET Dukes October 2019) |
Mitigations |
|
| Mitigation | Description |
|---|---|
| User Account Management |
Manage the creation, modification, use, and permissions associated to user accounts. |
| Behavior Prevention on Endpoint |
Use capabilities to prevent suspicious behavior patterns from occurring on endpoint systems. This could include suspicious process, file, API call, etc. behavior. |
| Limit Software Installation |
Block users or groups from installing unapproved software. |
| 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. |
| Audit |
Perform audits or scans of systems, permissions, insecure software, insecure configurations, etc. to identify potential weaknesses. |
| Restrict File and Directory Permissions |
Restrict access by setting directory and file permissions that are not specific to users or privileged accounts. |
| Code Signing |
Enforce binary and application integrity with digital signature verification to prevent untrusted code from executing. |
Detection
Monitor for changes to system processes that do not correlate with known software, patch cycles, etc., including by comparing results against a trusted system baseline. New, benign system processes may be created during installation of new software. 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. Command-line invocation of tools capable of modifying services may be unusual, depending on how systems are typically used in a particular environment. Look for abnormal process call trees from known services and for execution of other commands that could relate to Discovery or other adversary techniques. Monitor for changes to files associated with system-level processes.
References
- Faou, M., Tartare, M., Dupuy, T. (2019, October). OPERATION GHOST. Retrieved September 23, 2020.
- Patrick Wardle. (2016, February 29). Let's Play Doctor: Practical OS X Malware Detection & Analysis. Retrieved July 10, 2017.
- Microsoft. (n.d.). Services. Retrieved June 7, 2016.
- Apple. (n.d.). Creating Launch Daemons and Agents. Retrieved July 10, 2017.
- Jordan Geurten et al. . (2022, March 29). Microsoft recommended driver block rules. Retrieved April 7, 2022.
- Azure Edge and Platform Security Team & Microsoft 365 Defender Research Team. (2021, December 8). Improve kernel security with the new Microsoft Vulnerable and Malicious Driver Reporting Center. Retrieved April 6, 2022.
- ANSSI. (2021, January 27). SANDWORM INTRUSION SET CAMPAIGN TARGETING CENTREON SYSTEMS. Retrieved March 30, 2021.
Связанные риски
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