Update T1135.yaml (#2761)

Co-authored-by: Carrie Roberts <clr2of8@gmail.com>

atomics/T1135/T1135.yaml

@@ -210,3 +210,31 @@ atomic_tests:
     cleanup_command: remove-item "#{output_path}" -force -erroraction silentlycontinue
     name: powershell
     elevation_required: false
+- name: Enumerate All Network Shares with Snaffler
+  description: |
+    Snaffler is an open-source tool that has been used by various threat groups, including Scattered Spider/Muddled Libra, to enumerate accessible shares and credential-containing files within a domain. 
+    [Reference](https://unit42.paloaltonetworks.com/muddled-libra/)
+  supported_platforms:
+  - windows
+  input_arguments:
+    output_path:
+      description: File to output enumeration results to
+      type: String
+      default: '$env:temp\T1135SnafflerOutput.txt'
+    snaffler_path:
+      description: Path to the Snaffler executable
+      type: String
+      default: PathToAtomicsFolder\..\ExternalPayloads\Snaffler.exe
+  dependency_executor_name: powershell
+  dependencies:
+  - description: The Snaffler executable must exist on disk
+    prereq_command: if (Test-Path "PathToAtomicsFolder\..\ExternalPayloads\Snaffler.exe") {exit 0} else {exit 1}
+    get_prereq_command: |-
+      New-Item -Type Directory "PathToAtomicsFolder\..\ExternalPayloads\" -ErrorAction Ignore -Force | Out-Null
+      Invoke-WebRequest "https://github.com/SnaffCon/Snaffler/releases/download/1.0.150/Snaffler.exe" -OutFile "PathToAtomicsFolder\..\ExternalPayloads\Snaffler.exe"
+  executor:
+    command: |
+      invoke-expression 'cmd /c start powershell -command { cmd /c "#{snaffler_path}" -a -o "#{output_path}" }; start-sleep 90; stop-process -name "snaffler"'
+    cleanup_command: remove-item "#{output_path}" -force -erroraction silentlycontinue
+    name: powershell
+    elevation_required: false