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What separates the Stealth tactic from Defense Impairment in ATT&CK?

  • AStealth blends in; Defense Impairment attacks the controls
  • BStealth is pre-compromise; Defense Impairment is post-access
  • CStealth applies to Mobile; Defense Impairment to Enterprise
  • DStealth is a tactic; Defense Impairment is only a mitigation

Why this is the answer

ATT&CK v19 split the old Defense Evasion tactic along exactly this line: Stealth (TA0005) hides activity without modifying defenses, while Defense Impairment (TA0112) degrades or disables them outright. Both are post-compromise Enterprise tactics, and both are tactics — neither is Mobile-only nor a mitigation.

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