ルール更新 (#224)

rules/sigma/process_access/sysmon_direct_syscall_ntopenprocess.yml

@@ -0,0 +1,25 @@
+
+title: Direct Syscall of NtOpenProcess
+author: Christian Burkard
+date: 2021/07/28
+description: Detects the usage of the direct syscall of NtOpenProcess which might
+  be done from a CobaltStrike BOF.
+detection:
+  SELECTION_1:
+    EventID: 10
+  SELECTION_2:
+    CallTrace: UNKNOWN*
+  condition: (SELECTION_1 and SELECTION_2)
+falsepositives:
+- unknown
+id: 3f3f3506-1895-401b-9cc3-e86b16e630d0
+level: critical
+logsource:
+  category: process_access
+  product: windows
+references:
+- https://medium.com/falconforce/falconfriday-direct-system-calls-and-cobalt-strike-bofs-0xff14-741fa8e1bdd6
+status: experimental
+tags:
+- attack.execution
+- attack.t1106