Adversaries may target insecure credentials as a means to persist on a system or device or move laterally from one system or device to another. Insecure credentials may appear as default credentials which are pre-configured credentials on a system, device, or software that are well-known in documentation or hard-coded credentials which are built into the system, device, or software that cannot be changed or not easily changed because of the impact on control processes.[1],[2],[3]
Adversaries often times use insecure credentials to evade detection as they are typically forgotten about by system and device owners.

References

  1. Keith Stouffer. (2023, September). Guide to Operational Technology (OT) Security. Retrieved April 22, 2026.
  2. Cybersecurity and Infrastructure Security Agency (CISA). (2013, October 29). Medical Devices Hard-Coded Passwords. Retrieved April 23, 2026.
  3. Forescout Vedere Labs. (2022, June). OT: IceFall Report. Retrieved April 23, 2026.

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Default Credentials

Adversaries may leverage manufacturer or supplier set default credentials on control system devices. These default credentials may have administrative permissions and may be necessary for initial configuration of the device. It is general best practice to change the passwords for these accounts as soon as possible, but some manufacturers may have devices that have passwords or usernames that cannot be changed.[1]

Default credentials are normally documented in an instruction manual that is either packaged with the device, published online through official means, or published online through unofficial means. Adversaries may leverage default credentials that have not been properly modified or disabled.

References

  1. Keith Stouffer 2015, May Guide to Industrial Control Systems (ICS) Security Retrieved. 2018/03/28
Hardcoded Credentials

Adversaries may leverage credentials that are hardcoded in software or firmware to gain an unauthorized interactive user session to an asset. Examples credentials that may be hardcoded in an asset include:

  • Username/Passwords
  • Cryptographic keys/Certificates
  • API tokens

Unlike Default Credentials, these credentials are built into the system in a way that they either cannot be changed by the asset owner, or may be infeasible to change because of the impact it would cause to the control system operation. These credentials may be reused across whole product lines or device models and are often not published or known to the owner and operators of the asset.[1],[2]

Adversaries may utilize these hardcoded credentials to move throughout the control system environment or provide reliable access for their tools to interact with industrial assets.

References

  1. Cybersecurity and Infrastructure Security Agency (CISA). (2013, October 29). Medical Devices Hard-Coded Passwords. Retrieved April 23, 2026.
  2. Forescout Vedere Labs. (2022, June). OT: IceFall Report. Retrieved April 23, 2026.

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