diff --git a/atomics/Indexes/Indexes-CSV/index.csv b/atomics/Indexes/Indexes-CSV/index.csv
index 5705cb4a..617fec9f 100644
--- a/atomics/Indexes/Indexes-CSV/index.csv
+++ b/atomics/Indexes/Indexes-CSV/index.csv
@@ -818,6 +818,7 @@ execution,T1059.005,Visual Basic,2,Encoded VBS code execution,e8209d5f-e42d-45e6
 execution,T1059.005,Visual Basic,3,Extract Memory via VBA,8faff437-a114-4547-9a60-749652a03df6,powershell
 execution,T1059.003,Windows Command Shell,1,Create and Execute Batch Script,9e8894c0-50bd-4525-a96c-d4ac78ece388,powershell
 execution,T1059.003,Windows Command Shell,2,Writes text to a file and displays it.,127b4afe-2346-4192-815c-69042bec570e,command_prompt
+execution,T1059.003,Windows Command Shell,3,Suspicious Execution via Windows Command Shell,d0eb3597-a1b3-4d65-b33b-2cda8d397f20,command_prompt
 execution,T1047,Windows Management Instrumentation,1,WMI Reconnaissance Users,c107778c-dcf5-47c5-af2e-1d058a3df3ea,command_prompt
 execution,T1047,Windows Management Instrumentation,2,WMI Reconnaissance Processes,5750aa16-0e59-4410-8b9a-8a47ca2788e2,command_prompt
 execution,T1047,Windows Management Instrumentation,3,WMI Reconnaissance Software,718aebaa-d0e0-471a-8241-c5afa69c7414,command_prompt
diff --git a/atomics/Indexes/Indexes-CSV/windows-index.csv b/atomics/Indexes/Indexes-CSV/windows-index.csv
index d4703978..87b366f5 100644
--- a/atomics/Indexes/Indexes-CSV/windows-index.csv
+++ b/atomics/Indexes/Indexes-CSV/windows-index.csv
@@ -585,6 +585,7 @@ execution,T1059.005,Visual Basic,2,Encoded VBS code execution,e8209d5f-e42d-45e6
 execution,T1059.005,Visual Basic,3,Extract Memory via VBA,8faff437-a114-4547-9a60-749652a03df6,powershell
 execution,T1059.003,Windows Command Shell,1,Create and Execute Batch Script,9e8894c0-50bd-4525-a96c-d4ac78ece388,powershell
 execution,T1059.003,Windows Command Shell,2,Writes text to a file and displays it.,127b4afe-2346-4192-815c-69042bec570e,command_prompt
+execution,T1059.003,Windows Command Shell,3,Suspicious Execution via Windows Command Shell,d0eb3597-a1b3-4d65-b33b-2cda8d397f20,command_prompt
 execution,T1047,Windows Management Instrumentation,1,WMI Reconnaissance Users,c107778c-dcf5-47c5-af2e-1d058a3df3ea,command_prompt
 execution,T1047,Windows Management Instrumentation,2,WMI Reconnaissance Processes,5750aa16-0e59-4410-8b9a-8a47ca2788e2,command_prompt
 execution,T1047,Windows Management Instrumentation,3,WMI Reconnaissance Software,718aebaa-d0e0-471a-8241-c5afa69c7414,command_prompt
diff --git a/atomics/Indexes/Indexes-Markdown/index.md b/atomics/Indexes/Indexes-Markdown/index.md
index f96bd50a..868bc4f7 100644
--- a/atomics/Indexes/Indexes-Markdown/index.md
+++ b/atomics/Indexes/Indexes-Markdown/index.md
@@ -1470,6 +1470,7 @@
 - [T1059.003 Windows Command Shell](../../T1059.003/T1059.003.md)
   - Atomic Test #1: Create and Execute Batch Script [windows]
   - Atomic Test #2: Writes text to a file and displays it. [windows]
+  - Atomic Test #3: Suspicious Execution via Windows Command Shell [windows]
 - [T1047 Windows Management Instrumentation](../../T1047/T1047.md)
   - Atomic Test #1: WMI Reconnaissance Users [windows]
   - Atomic Test #2: WMI Reconnaissance Processes [windows]
diff --git a/atomics/Indexes/Indexes-Markdown/windows-index.md b/atomics/Indexes/Indexes-Markdown/windows-index.md
index dd913c70..3fc9f744 100644
--- a/atomics/Indexes/Indexes-Markdown/windows-index.md
+++ b/atomics/Indexes/Indexes-Markdown/windows-index.md
@@ -1064,6 +1064,7 @@
 - [T1059.003 Windows Command Shell](../../T1059.003/T1059.003.md)
   - Atomic Test #1: Create and Execute Batch Script [windows]
   - Atomic Test #2: Writes text to a file and displays it. [windows]
+  - Atomic Test #3: Suspicious Execution via Windows Command Shell [windows]
 - [T1047 Windows Management Instrumentation](../../T1047/T1047.md)
   - Atomic Test #1: WMI Reconnaissance Users [windows]
   - Atomic Test #2: WMI Reconnaissance Processes [windows]
diff --git a/atomics/Indexes/index.yaml b/atomics/Indexes/index.yaml
index 6e49e660..9f6d2752 100644
--- a/atomics/Indexes/index.yaml
+++ b/atomics/Indexes/index.yaml
@@ -61581,6 +61581,27 @@ execution:
 
 '
         name: command_prompt
+    - name: Suspicious Execution via Windows Command Shell
+      auto_generated_guid: d0eb3597-a1b3-4d65-b33b-2cda8d397f20
+      description: 'Command line executed via suspicious invocation. Example is from
+        the 2021 Threat Detection Report by Red Canary.
+
+'
+      supported_platforms:
+      - windows
+      input_arguments:
+        output_file:
+          description: File to output to
+          type: string
+          default: hello.txt
+        input_message:
+          description: Message to write to file
+          type: string
+          default: Hello, from CMD!
+      executor:
+        command: "%LOCALAPPDATA:~-3,1%md /c echo #{input_message} > #{output_file}
+          & type #{output_file}\n"
+        name: command_prompt
   T1047:
     technique:
       id: attack-pattern--01a5a209-b94c-450b-b7f9-946497d91055
diff --git a/atomics/T1059.003/T1059.003.md b/atomics/T1059.003/T1059.003.md
index 4a96ddef..61786e57 100644
--- a/atomics/T1059.003/T1059.003.md
+++ b/atomics/T1059.003/T1059.003.md
@@ -12,6 +12,8 @@ Adversaries may leverage [cmd](https://attack.mitre.org/software/S0106) to execu
 
 - [Atomic Test #2 - Writes text to a file and displays it.](#atomic-test-2---writes-text-to-a-file-and-displays-it)
 
+- [Atomic Test #3 - Suspicious Execution via Windows Command Shell](#atomic-test-3---suspicious-execution-via-windows-command-shell)
+
 
 <br/>
 
@@ -101,4 +103,38 @@ del "#{file_contents_path}"
 
 
 
+<br/>
+<br/>
+
+## Atomic Test #3 - Suspicious Execution via Windows Command Shell
+Command line executed via suspicious invocation. Example is from the 2021 Threat Detection Report by Red Canary.
+
+**Supported Platforms:** Windows
+
+
+**auto_generated_guid:** d0eb3597-a1b3-4d65-b33b-2cda8d397f20
+
+
+
+
+
+#### Inputs:
+| Name | Description | Type | Default Value |
+|------|-------------|------|---------------|
+| output_file | File to output to | string | hello.txt|
+| input_message | Message to write to file | string | Hello, from CMD!|
+
+
+#### Attack Commands: Run with `command_prompt`! 
+
+
+```cmd
+%LOCALAPPDATA:~-3,1%md /c echo #{input_message} > #{output_file} & type #{output_file}
+```
+
+
+
+
+
+
 <br/>