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feat(rules): New CldApi DLL loaded by an unusual process rule#678

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cldapi-dll-loaded-by-an-unusual-process
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feat(rules): New CldApi DLL loaded by an unusual process rule#678
rabbitstack wants to merge 1 commit into
masterfrom
cldapi-dll-loaded-by-an-unusual-process

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What is the purpose of this PR / why it is needed?

Detects the loading of cldapi.dll (Cloud Filter API) by processes other than those legitimately associated with Windows Cloud Files infrastructure and OneDrive sync functionality. Adversaries may abuse the Cloud Filter API to hijack execution flow and evade defenses, for example, by exploiting BindLink or redirector mechanisms to sideload malicious code into trusted processes or redirect file system operations.

What type of change does this PR introduce?


Uncomment one or more /kind <> lines:

/kind feature (non-breaking change which adds functionality)

/kind bug-fix (non-breaking change which fixes an issue)

/kind refactor (non-breaking change that restructures the code, while not changing the original functionality)

/kind breaking (fix or feature that would cause existing functionality to not work as expected

/kind cleanup

/kind improvement

/kind design

/kind documentation

/kind other (change that doesn't pertain to any of the above categories)

Any specific area of the project related to this PR?


Uncomment one or more /area <> lines:

/area instrumentation

/area telemetry

/area rule-engine

/area filters

/area yara

/area event

/area captures

/area alertsenders

/area outputs

/area rules

/area filaments

/area config

/area cli

/area tests

/area ci

/area build

/area docs

/area deps

/area evasion

/area other

Special notes for the reviewer


Does this PR introduce a user-facing change?


Detects the loading of cldapi.dll (Cloud Filter API) by processes other than
those legitimately associated with Windows Cloud Files infrastructure and OneDrive
sync functionality. Adversaries may abuse the Cloud Filter API to hijack execution
flow and evade defenses, for example by exploiting BindLink or redirector mechanisms
to sideload malicious code into trusted processes or redirect file system operations.
@rabbitstack rabbitstack added the rules Anything related to detection rules label Jun 16, 2026
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