A new Microsoft 365 application was installed

microsoft-365

Classification:

attack

Tactic:

TA0003-persistence

Technique:

T1136-create-account

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Goal

Detect when a new Microsoft 365 app is installed as a means of establishing persistence.

Strategy

Monitor Microsoft 365 audit logs to look for events with an @evt.name value of Add application. and event @evt.outcome of Success.

Triage and response

  1. Determine if the user {{@usr.email}} intended to install {{@ObjectId}}.
  2. If {{@usr.email}} is not responsible for installing {{@ObjectId}}, investigate {{@usr.email}} for anomalous activity. If necessary, initiate your company’s incident response (IR) process.