Feature/rm submodule (#312)

* rm: submodule

* Add: rules

* Fix: hayabusa-rules to c9c10a

rules/sigma/process_creation/win_dnscat2_powershell_implementation.yml

@@ -0,0 +1,42 @@
+
+title: DNSCat2 Powershell Implementation Detection Via Process Creation
+ruletype: Sigma
+author: Cian Heasley
+date: 2020/08/08
+description: The PowerShell implementation of DNSCat2 calls nslookup to craft queries.
+  Counting nslookup processes spawned by PowerShell will show hundreds or thousands
+  of instances if PS DNSCat2 is active locally.
+detection:
+  SELECTION_1:
+    EventID: 1
+  SELECTION_2:
+    ParentImage: '*\powershell.exe'
+  SELECTION_3:
+    Image: '*\nslookup.exe'
+  SELECTION_4:
+    CommandLine: '*\nslookup.exe'
+  condition: (SELECTION_1 and SELECTION_2 and SELECTION_3 and SELECTION_4) | count(Image)
+    by ParentImage > 100
+falsepositives:
+- Other powershell scripts that call nslookup.exe
+fields:
+- Image
+- CommandLine
+- ParentImage
+id: b11d75d6-d7c1-11ea-87d0-0242ac130003
+level: high
+logsource:
+  category: process_creation
+  product: windows
+modified: 2021/11/27
+references:
+- https://github.com/lukebaggett/dnscat2-powershell
+- https://blu3-team.blogspot.com/2019/08/powershell-dns-c2-notes.html
+- https://ragged-lab.blogspot.com/2020/06/it-is-always-dns-powershell-edition.html
+status: test
+tags:
+- attack.command_and_control
+- attack.t1071
+- attack.t1071.004
+- attack.t1001.003
+- attack.t1041