Suspicious authentication with Azure Password Hash Sync user

Synopsis

Field	Value
Activation Period	14 Days
Training Period	30 Days
Test Period	N/A (single event)
Deduplication Period	1 Day
Required Data	AzureAD
Detection Modules	Identity Analytics
ATT&CK Tactic	Initial Access (TA0001), Stealth (TA0005), Defense Impairment (TA0112)
ATT&CK Technique	Valid Accounts (T1078), Modify Authentication Process: Hybrid Identity (T1556.007)
Severity	Medium

Description

Authentication to an unusual authentication target was performed by the Azure AD Password Hash Sync user.

Attacker's Goals

• The attacker may be attempting to exploit a PHS user, the attacker wants to escalate and abuse this user, to get access to all the user's hashes.

Investigative actions

• Follow further actions done by the account.