Added Sigma Rules

rules/Sigma/win_susp_sysprep_appdata.yml

@@ -0,0 +1,31 @@
+title: Sysprep on AppData Folder
+author: Florian Roth
+date: 2018/06/22
+description: Detects suspicious sysprep process start with AppData folder as target
+    (as used by Trojan Syndicasec in Thrip report by Symantec)
+detection:
+    SELECTION_1:
+        EventID: 1
+    SELECTION_2:
+        Image: '*\sysprep.exe'
+    SELECTION_3:
+        CommandLine: '*\AppData\\*'
+    condition: (SELECTION_1 and (SELECTION_2) and (SELECTION_3))
+falsepositives:
+- False positives depend on scripts and administrative tools used in the monitored
+    environment
+id: d5b9ae7a-e6fc-405e-80ff-2ff9dcc64e7e
+level: medium
+logsource:
+    category: process_creation
+    product: windows
+modified: 2018/12/11
+references:
+- https://www.symantec.com/blogs/threat-intelligence/thrip-hits-satellite-telecoms-defense-targets
+- https://app.any.run/tasks/61a296bb-81ad-4fee-955f-3b399f4aaf4b
+status: experimental
+tags:
+- attack.execution
+yml_filename: win_susp_sysprep_appdata.yml
+yml_path: /Users/user/Documents/YamatoSecurity/sigma/rules/windows/process_creation
+