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Detectionmediumexperimental

Windows AppX Deployment Unsigned Package Installation

Detects attempts to install unsigned MSIX/AppX packages using the -AllowUnsigned parameter via AppXDeployment-Server events

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Michael Haag, Swachchhanda Shrawan Poudel (Nextron Systems)Created Mon Nov 039a025188-6f2d-42f8-bb2f-d3a83d24a5afwindows
Log Source
Windowsappxdeployment-server
ProductWindows← raw: windows
Serviceappxdeployment-server← raw: appxdeployment-server
Detection Logic
Detection Logic1 selector
detection:
    selection:
        EventID: 603
        Flags: '8388608'
    condition: selection
False Positives

Legitimate installation of unsigned packages for legitimate purposes such as development or testing

References
1
Resolving title…
docs.microsoft.com
2
Resolving title…
splunk.com
MITRE ATT&CK
Related Rules
SimilarDetectionmedium

Unsigned AppX Installation Attempt Using Add-AppxPackage

Detects usage of the "Add-AppxPackage" or it's alias "Add-AppPackage" to install unsigned AppX packages

Detects similar activity. Both rules may fire on overlapping events.

SimilarDetectionmedium

Unsigned AppX Installation Attempt Using Add-AppxPackage - PsScript

Detects usage of the "Add-AppxPackage" or it's alias "Add-AppPackage" to install unsigned AppX packages

Detects similar activity. Both rules may fire on overlapping events.

Rule Metadata
Rule ID
9a025188-6f2d-42f8-bb2f-d3a83d24a5af
Status
experimental
Level
medium
Type
Detection
Created
Mon Nov 03
Author
Michael Haag, Swachchhanda Shrawan Poudel (Nextron Systems)
Path
rules/windows/builtin/appxdeployment_server/win_appxpackaging_server_unsigned_package_installation.yml
Raw Tags
attack.defense-evasionattack.executionattack.t1204.002attack.t1553.005
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