[New Rule]- Credential Access - Domain DPAPI Backup key (#125)

* new rule - credential access Domain Backup DPAPI Private Keys Access * Update credential_access_domain_backup_dpapi_private_keys.toml * Update rules/windows/credential_access_domain_backup_dpapi_private_keys.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> * Update rules/windows/credential_access_domain_backup_dpapi_private_keys.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> * Update rules/windows/credential_access_domain_backup_dpapi_private_keys.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> * Update rules/windows/credential_access_domain_backup_dpapi_private_keys.toml Co-authored-by: Brent Murphy <56412096+bm11100@users.noreply.github.com> * Linted * added an extra reference * Update rules/windows/credential_access_domain_backup_dpapi_private_keys.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> Co-authored-by: Brent Murphy <56412096+bm11100@users.noreply.github.com>
2020-09-29 21:14:07 +02:00
parent c6519a2474
commit f15d179a50
1 changed files with 46 additions and 0 deletions
@@ -0,0 +1,46 @@
+[metadata]
+creation_date = "2020/08/13"
+ecs_version = ["1.6.0"]
+maturity = "production"
+updated_date = "2020/08/13"
+
+[rule]
+author = ["Elastic"]
+description = """
+Identifies the creation or modification of Domain Backup private keys. Adversaries may extract the Data Protection API
+(DPAPI) domain backup key from a Domain Controller (DC) to be able to decrypt any domain user master key file.
+"""
+from = "now-9m"
+index = ["winlogbeat-*", "logs-endpoint.events.*"]
+language = "kuery"
+license = "Elastic License"
+name = "Creation or Modification of Domain Backup DPAPI private key"
+note = "### Domain DPAPI Backup keys are stored on domain controllers and can be dumped remotely with tools such as Mimikatz. The resulting .pvk private key can be used to decrypt ANY domain user masterkeys, which then can be used to decrypt any secrets protected by those keys."
+references = [
+    "https://www.dsinternals.com/en/retrieving-dpapi-backup-keys-from-active-directory/",
+    "https://www.harmj0y.net/blog/redteaming/operational-guidance-for-offensive-user-dpapi-abuse/",
+]
+risk_score = 73
+rule_id = "b83a7e96-2eb3-4edf-8346-427b6858d3bd"
+severity = "high"
+tags = ["Elastic", "Windows"]
+type = "query"
+
+query = '''
+event.category:file and not event.type:deletion and 
+ file.name:(ntds_capi_*.pfx or ntds_capi_*.pvk)
+'''
+
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+id = "T1145"
+name = "Private Keys"
+reference = "https://attack.mitre.org/techniques/T1145/"
+
+
+[rule.threat.tactic]
+id = "TA0006"
+name = "Credential Access"
+reference = "https://attack.mitre.org/tactics/TA0006/"