Windows Redcannary

rules/windows/powershell/powershell_script/posh_ps_suspicious_iofilestream.yml

@@ -0,0 +1,25 @@
+title: Suspicious IO.FileStream
+id: 70ad982f-67c8-40e0-a955-b920c2fa05cb
+status: experimental
+description: open a handle on the drive volume via the \\.\ DOS device path specifier and perform direct access read of the first few bytes of the volume.
+date: 2022/01/09
+author: frack113
+references:
+    - https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1006/T1006.md
+logsource:
+    product: windows
+    category: ps_script
+    definition: Script block logging must be enabled
+detection:
+    selection:
+        ScriptBlockText|contains|all:
+            - New-Object 
+            - IO.FileStream
+            - '"\\.\'
+    condition: selection
+falsepositives:
+    - Legitimate PowerShell scripts
+level: medium
+tags:
+    - attack.defense_evasion
+    - attack.t1070.003