T1037 - Boot or Logon Initialization Scripts

Adversaries may use scripts automatically executed at boot or logon initialization to establish persistence. Initialization scripts can be used to perform administrative functions, which may often execute other programs or send information to an internal logging server. These scripts can vary based on operating system and whether applied locally or remotely.

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.

An adversary may also be able to escalate their privileges since some boot or logon initialization scripts run with higher privileges.

Atomic Tests:

Currently, no tests are available for this technique.

Detection

Monitor logon scripts for unusual access by abnormal users or at abnormal times. Look for files added or modified by unusual accounts outside of normal administration duties. Monitor running process for actions that could be indicative of abnormal programs or executables running upon logon.

Shield Active Defense

Baseline

Identify key system elements to establish a baseline and be prepared to reset a system to that baseline when necessary.

Identify elements of software and configuration critical to a set of objectives, define their proper values, and be prepared to reset a running system to its intended state.

Opportunity

There is an opportunity to utilize confirmed good copies of login scripts and restoring on a frequent basis to prevent an adversary from using them to launch malware on a recurring basis.

Use Case

A defender can revert a system to a verified baseline a frequent, recurring basis in order to remove adversary persistence mechanisms.

Procedures

Maintain a verified baseline firewall configuration and use that copy as a fallback if an adversary alters that information. Maintain a verified list of group policies enforced on a system and use that copy if an adversary attempts to deviate from the baseline.