Merge pull request #2647 from frack113/red_20220206

add posh_ps_get_adreplaccount

rules/windows/powershell/powershell_script/posh_ps_get_adreplaccount.yml

@@ -0,0 +1,28 @@
+title: Suspicious Get-ADReplAccount
+id: 060c3ef1-fd0a-4091-bf46-e7d625f60b73
+status: experimental
+description: 
+  The DSInternals PowerShell Module exposes several internal features of Active Directory and Azure Active Directory.
+  These include FIDO2 and NGC key auditing, offline ntds.dit file manipulation, password auditing, DC recovery from IFM backups and password hash calculation. 
+date: 2022/02/06
+author: frack113
+references:
+    - https://www.powershellgallery.com/packages/DSInternals
+    - https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1003.006/T1003.006.md#atomic-test-2---run-dsinternals-get-adreplaccount
+logsource:
+    product: windows
+    category: ps_script
+    definition: Script block logging must be enabled
+detection:
+    selection:
+        ScriptBlockText|contains|all: 
+            - Get-ADReplAccount
+            - '-All '
+            - '-Server '
+    condition: selection
+falsepositives:
+    - Legitimate PowerShell scripts
+level: medium
+tags:
+    - attack.credential_access
+    - attack.t1003.006