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Hash Calculation of PE Images
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Hash Calculation of PE Images
uberAgent ESA calculates hashes of executables (e.g., .exe
, .dll
or .sys
files). Whenever a process is started or a DLL is loaded, uberAgent calculates the hash of the file located on disk. uberAgent supports the hash variants MD5
, SHA-1
, SHA-256
, and ImpHash
both individually and simultaneously.
Configuration
The uberAgent ESA hash calculation feature is configured through the process startup setting EnableCalculateHash
. In the default configuration, MD5
hash calculation is enabled.
Process and library (DLL) hashes are cached to reduce CPU load. Cache lifetime is managed automatically. The cache’s size can be configured (or disabled altogether) via the configuration setting HashesCacheMaxSize
.
Metadata
Sourcetype
Process hashes are part of the sourcetypes uberAgent:Process:ProcessStartup
and uberAgentESA:Process:ProcessStop
. Please see the metrics documentation for a description of the fields.
Due to the huge amount of data being produced, hash values for image load events are not sent to the backend but can be used with the Threat Detection Engine.
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