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Detection rules › Sigma

Windows Defender AMSI Trigger Detected

Status
stable
Severity
high
Log source
product windows, service windefend
Author
Bhabesh Raj
Source
github.com/SigmaHQ/sigma

Detects triggering of AMSI by Windows Defender.

MITRE ATT&CK coverage

TacticTechniques
ExecutionT1059 Command and Scripting Interpreter

Event coverage

ProviderEvent
Windows-DefenderEvent ID 1116

Rule body yaml

title: Windows Defender AMSI Trigger Detected
id: ea9bf0fa-edec-4fb8-8b78-b119f2528186
status: stable
description: Detects triggering of AMSI by Windows Defender.
references:
    - https://learn.microsoft.com/en-us/windows/win32/amsi/how-amsi-helps
author: Bhabesh Raj
date: 2020-09-14
modified: 2022-12-07
tags:
    - attack.execution
    - attack.t1059
logsource:
    product: windows
    service: windefend
detection:
    selection:
        EventID: 1116 # The antimalware platform detected malware or other potentially unwanted software.
        SourceName: 'AMSI'
    condition: selection
falsepositives:
    - Unlikely
level: high

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    EventID: 1116
    SourceName: 'AMSI'

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

FieldKindValues
SourceNameeq
  • AMSI