self-delete-via-comspec-environment-variable.yml

rule:
  meta:
    name: self delete via COMSPEC environment variable
    namespace: anti-analysis/anti-forensic/self-deletion
    author: michael.hunhoff@fireeye.com
    scope: function
    att&ck:
      - Defense Evasion::Indicator Removal on Host::File Deletion [T1070.004]
    mbc:
      - Defense Evasion::Self Deletion::COMSPEC Environment Variable [F0007.001]
    examples:
      - Practical Malware Analysis Lab 14-02.exe_:0x401880
  features:
    - and:
      - match: get COMSPEC environment variable
      - match: create process
      # /c del
      - string: /\/c\s*del\s*/
      - optional:
        # > nul
        - string: /\s*>\s*nul\s*/