Detection rules › Sigma
Host set with constrained delegation
Detects scenarios where an attacker modifies host delegation settings for privilege escalation.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Persistence | T1098 Account Manipulation |
Event coverage
| Provider | Event | Title |
|---|---|---|
| Security-Auditing | Event ID 4742 | A computer account was changed. |
Rule body yaml
title: Host set with constrained delegation
description: Detects scenarios where an attacker modifies host delegation settings for privilege escalation.
references:
- https://github.com/mdecrevoisier/EVTX-to-MITRE-Attack/tree/master/TA0003-Persistence/T1098.xxx-Account%20manipulation
- https://dirkjanm.io/krbrelayx-unconstrained-delegation-abuse-toolkit/
- https://www.alsid.com/crb_article/kerberos-delegation/
- https://www.harmj0y.net/blog/activedirectory/s4u2pwnage/
- https://shenaniganslabs.io/2019/01/28/Wagging-the-Dog.html
- https://www.ired.team/offensive-security-experiments/active-directory-kerberos-abuse/abusing-kerberos-constrained-delegation
- https://www.guidepointsecurity.com/delegating-like-a-boss-abusing-kerberos-delegation-in-active-directory/
- https://stealthbits.com/blog/what-is-kerberos-delegation-an-overview-of-kerberos-delegation/
- https://posts.specterops.io/hunting-in-active-directory-unconstrained-delegation-forests-trusts-71f2b33688e1
- https://www.thehacker.recipes/ad/movement/kerberos/delegations#talk
tags:
- attack.persistence
- attack.t1098
author: mdecrevoisier
status: experimental
logsource:
product: windows
service: security
detection:
selection: # Delegation to specified service, any protocol
EventID: 4742
selection1:
UserAccountControl: '%%2098' # Enable option "Approved for authenticated delegation"
selection2:
AllowedToDelegateTo: '-' # Can be: "cifs/srv01 cifs/srv02.demo.lan dcom/dc03..."
condition: selection and (selection1 OR NOT selection2)
falsepositives:
- Rare administrator modifying host delegation settings
level: high
Stages and Predicates
Stage 0: condition
selection and (selection1 OR NOT selection2)Stage 1: selection
selection:
EventID: 4742
Stage 2: selection1
selection1:
UserAccountControl: '%%2098'
Stage 3: not selection2
selection2:
AllowedToDelegateTo: '-'
Exclusions
Top-level NOT(...) conjuncts: predicates this rule actively suppresses.
| Field | Kind | Excluded values |
|---|---|---|
AllowedToDelegateTo | eq | - |
Indicators
Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.
| Field | Kind | Values |
|---|---|---|
UserAccountControl | eq |
|