check-for-peb-ntglobalflag-flag.yml

rule:
  meta:
    name: check for PEB NtGlobalFlag flag
    namespace: anti-analysis/anti-debugging/debugger-detection
    author: moritz.raabe@fireeye.com
    scope: basic block
    mbc:
      - Anti-Behavioral Analysis::Detect Debugger::Process Environment Block
    references:
      - Practical Malware Analysis, Chapter 16, p. 355
      - https://www.geoffchappell.com/studies/windows/win32/ntdll/structs/peb/index.htm
    examples:
      - Practical Malware Analysis Lab 16-01.exe_:0x403530
  features:
    - and:
      - characteristic: peb access
      - or:
        # 32-bit
        - offset: 0x68 = PEB.NtGlobalFlag
        # 64-bit
        - offset: 0xBC = PEB.NtGlobalFlag
      - number: 0x70 = (FLG_HEAP_ENABLE_TAIL_CHECK | FLG_HEAP_ENABLE_FREE_CHECK | FLG_HEAP_VALIDATE_PARAMETERS)