Added new test case - T1027.001

Added a new test case.
Minor changes to the existing test case.

atomics/T1027.001/T1027.001.yaml

@@ -25,7 +25,37 @@ atomic_tests:
       cp /bin/ls #{file_to_pad}
   executor:
     command: |
-      dd if=/dev/zero bs=1 count=1 >> #{file_to_pad}
+      dd if=/dev/zero bs=1 count=1 >> #{file_to_pad} #adds null bytes
+      dd if=/dev/random bs=1 count=1 >> #{file_to_pad} #adds high-quality random data
+      dd if=/dev/urandom bs=1 count=1 >> #{file_to_pad} #adds low-quality random data
+    cleanup_command: |
+      rm #{file_to_pad}
+    name: sh
+    
+- name: Pad Binary to Change Hash using truncate command - Linux/macOS
+  description: |
+    Uses truncate to add number of bytes to the binary to change the hash.
+
+    Upon successful execution, truncate will modify `/tmp/evil-binary`, therefore the expected hash will change.
+  supported_platforms:
+  - macos
+  - linux
+  input_arguments:
+    file_to_pad:
+      description: Path of binary to be padded
+      type: path
+      default: /tmp/evil-binary
+  dependency_executor_name: bash
+  dependencies:
+  - description: |
+      The binary must exist on disk at specified location (#{file_to_pad})
+    prereq_command: |
+      if [ -f #{file_to_pad} ]; then exit 0; else exit 1; fi;
+    get_prereq_command: |
+      cp /bin/ls #{file_to_pad}
+  executor:
+    command: |
+      truncate -s +1 #{file_to_pad} #adds a byte to the file size
     cleanup_command: |
       rm #{file_to_pad}
     name: sh