Adversaries may use Windows logon scripts automatically executed at logon initialization to establish persistence. Windows allows logon scripts to be run whenever a specific user or group of users log into a system.^[1] This is done via adding a path to a script to the HKCU\Environment\UserInitMprLogonScript Registry key.^[2]

Adversaries may use these scripts to maintain persistence on a single system. Depending on the access configuration of the logon scripts, either local credentials or an administrator account may be necessary.

References

1. Microsoft. (2005, January 21). Creating logon scripts. Retrieved April 27, 2016.
2. Hexacorn. (2014, November 14). Beyond good ol’ Run key, Part 18. Retrieved November 15, 2019.

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