Suspicious AS-REP Roasting LDAP Search Filter for DONT_REQ_PREAUTH Accounts

ATT&CK techniques

Cred Access → Discovery

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
- T1558.004AS-REP Roasting
Discovery
- T1087.002Domain Account
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects Directory Service search event 1644 carrying an LDAP filter that uses the bitwise OID to select accounts with the DONT_REQUIRE_PREAUTH flag set, matching Impacket GetNPUsers enumeration for AS-REP roasting. Adversaries query these accounts to request roastable tickets crackable offline. This precise bitwise filter is rarely produced by legitimate directory tooling.

Reporting behind it

Related detections9 linkedT1087.002 — drag to rearrange

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Suspicious Remote Connection to ADWS Port 9389 via security

Suspicious Octo Tempest Domain and Network Reconnaissance Tooling (via process_creation)

Suspicious Active Directory Computer Export via csvde (via process_creation)

Suspicious AS-REP Roasting LDAP Search Filter for DONT_REQ_PREAUTH Accounts

Pivot detection · T1087.002 · 9 related

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

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