From 748bdbf8b184b4d1ebff9ec7fff25992f951dfad Mon Sep 17 00:00:00 2001
From: Isai <59296946+imays11@users.noreply.github.com>
Date: Wed, 1 Feb 2023 10:27:42 -0500
Subject: [PATCH] [New Rule] Enumerating Domain Trusts via Dsquery.exe (#2508)

* [New Rule] Enumerating Domain Trusts via Dsquery.exe

T1482 Domain Trust Discovery

New rule to capture domain trust discovery with dsquery.

* Update discovery_enumerating_domain_trusts_via_dsquery.toml

I think it would be beneficial to add the process.pe.original_file_name : "dsquery.exe" to the rule, as it would be easy for an attacker to bypass this rule by changing the file name, as so: https://prnt.sc/ZqePZKuV1-Vq

Other than that, LGTM!

---------

Co-authored-by: Ruben Groenewoud <78494512+Aegrah@users.noreply.github.com>
Co-authored-by: Samirbous <64742097+Samirbous@users.noreply.github.com>
---
 ...enumerating_domain_trusts_via_dsquery.toml | 58 +++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 rules/windows/discovery_enumerating_domain_trusts_via_dsquery.toml

diff --git a/rules/windows/discovery_enumerating_domain_trusts_via_dsquery.toml b/rules/windows/discovery_enumerating_domain_trusts_via_dsquery.toml
new file mode 100644
index 000000000..258fb593b
--- /dev/null
+++ b/rules/windows/discovery_enumerating_domain_trusts_via_dsquery.toml
@@ -0,0 +1,58 @@
+[metadata]
+creation_date = "2023/01/27"
+integration = ["endpoint", "windows"]
+maturity = "production"
+min_stack_comments = "New fields added: required_fields, related_integrations, setup"
+min_stack_version = "8.3.0"
+updated_date = "2023/01/27"
+
+[rule]
+author = ["Elastic"]
+description = """
+Identifies the use of dsquery.exe for domain trust discovery purposes. Adversaries may use this command-line utility to
+enumerate trust relationships that may be used for Lateral Movement opportunities in Windows multi-domain forest
+environments.
+"""
+false_positives = [
+    "Domain administrators may use this command-line utility for legitimate information gathering purposes.",
+]
+from = "now-9m"
+index = ["winlogbeat-*", "logs-endpoint.events.*", "logs-windows.*", "endgame-*"]
+language = "eql"
+license = "Elastic License v2"
+name = "Enumerating Domain Trusts via DSQUERY.EXE"
+note = """## Setup
+
+If enabling an EQL rule on a non-elastic-agent index (such as beats) for versions <8.2, events will not define `event.ingested` and default fallback for EQL rules was not added until 8.2, so you will need to add a custom pipeline to populate `event.ingested` to @timestamp for this rule to work.
+"""
+references = [
+    "https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2012-r2-and-2012/cc732952(v=ws.11)",
+    "https://posts.specterops.io/a-guide-to-attacking-domain-trusts-971e52cb2944",
+]
+risk_score = 21
+rule_id = "06a7a03c-c735-47a6-a313-51c354aef6c3"
+severity = "low"
+tags = ["Elastic", "Host", "Windows", "Threat Detection", "Discovery", "Elastic Endgame"]
+timestamp_override = "event.ingested"
+type = "eql"
+
+query = '''
+process where event.type == "start" and
+    (process.name : "dsquery.exe" or process.pe.original_file_name: "dsquery.exe") and 
+    process.args : "*objectClass=trustedDomain*"
+'''
+
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+id = "T1482"
+name = "Domain Trust Discovery"
+reference = "https://attack.mitre.org/techniques/T1482/"
+
+
+[rule.threat.tactic]
+id = "TA0007"
+name = "Discovery"
+reference = "https://attack.mitre.org/tactics/TA0007/"
+