Add: sigma rules (#175)

rules/sigma/windows/process_creation/process_creation_sdelete.yml

@@ -0,0 +1,35 @@
+
+title: Sysinternals SDelete Delete File
+author: frack113
+date: 2021/06/03
+description: Use of SDelete to erase a file not the free space
+detection:
+  SELECTION_1:
+    EventID: 1
+  SELECTION_2:
+    OriginalFileName: sdelete.exe
+  SELECTION_3:
+    CommandLine:
+    - '* -h*'
+    - '* -c*'
+    - '* -z*'
+    - '* /?*'
+  condition: (SELECTION_1 and SELECTION_2 and  not (SELECTION_3))
+falsepositives:
+- System administrator Usage
+fields:
+- ComputerName
+- User
+- CommandLine
+- ParentCommandLine
+id: a4824fca-976f-4964-b334-0621379e84c4
+level: medium
+logsource:
+  category: process_creation
+  product: windows
+references:
+- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1485/T1485.md
+status: experimental
+tags:
+- attack.impact
+- attack.t1485