AMSI Disabled via Registry Modification

calendar Apr 28, 2026 · attack.defense-impairment attack.t1685  ·
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Detects attempts to disable AMSI (Anti-Malware Scan Interface) by modifying the AmsiEnable registry value. Anti-Malware Scan Interface (AMSI) is a security feature in Windows that allows applications and services to integrate with anti-malware products for enhanced protection against malicious content. Adversaries may attempt to disable AMSI to evade detection by security software, allowing them to execute malicious scripts or code without being scanned.

Sigma rule (View on GitHub)

 1title: AMSI Disabled via Registry Modification
 2id: aa37cbb0-da36-42cb-a90f-fdf216fc7467
 3related:
 4    - id: 7dbbcac2-57a0-45ac-b306-ff30a8bd2981 # Windows AMSI Related Registry Tampering Via CommandLine
 5      type: similar
 6status: experimental
 7description: |
 8    Detects attempts to disable AMSI (Anti-Malware Scan Interface) by modifying the AmsiEnable registry value.
 9    Anti-Malware Scan Interface (AMSI) is a security feature in Windows that allows applications and services to integrate with anti-malware products for enhanced protection against malicious content.
10    Adversaries may attempt to disable AMSI to evade detection by security software, allowing them to execute malicious scripts or code without being scanned.    
11references:
12    - https://mostafayahiax.medium.com/hunting-for-amsi-bypassing-methods-9886dda0bf9d
13    - https://docs.microsoft.com/en-us/windows/win32/amsi/antimalware-scan-interface-portal
14    - https://www.mdsec.co.uk/2019/02/macros-and-more-with-sharpshooter-v2-0/
15author: Swachchhanda Shrawan Poudel (Nextron Systems)
16date: 2025-12-25
17tags:
18    - attack.defense-impairment
19    - attack.t1685
20logsource:
21    category: registry_set
22    product: windows
23detection:
24    selection:
25        TargetObject|endswith: '\Software\Microsoft\Windows Script\Settings\AmsiEnable'
26        Details: 'DWORD (0x00000000)'
27    condition: selection
28falsepositives:
29    - Unlikely
30level: high
31regression_tests_path: regression_data/rules/windows/registry/registry_set/registry_set_amsi_disable/info.yml
32simulation:
33    - type: atomic-red-team
34      name: AMSI Bypass - Create AMSIEnable Reg Key
35      technique: T1562.001
36      atomic_guid: 728eca7b-0444-4f6f-ac36-437e3d751dc0

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