Amsi.DLL Loaded Via LOLBIN Process

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About the rule

Rule Type

Standard

Rule Description

Detects loading of "Amsi.dll" by a living of the land process. This could be an indication of a "PowerShell without PowerShell" attack

Severity

Trouble

Rule Requirement

Criteria

Action1: actionname = "sa_imageloaded" AND OBJECTNAME endswith "\amsi.dll" AND PROCESSNAME endswith "\ExtExport.exe,\odbcconf.exe,\regsvr32.exe,\rundll32.exe" select Action1.HOSTNAME,Action1.MESSAGE,Action1.PROCESSNAME,Action1.PRODUCT_NAME,Action1.OBJECTNAME

Detection

Execution Mode

realtime

Log Sources

Windows

Author

Nasreddine Bencherchali (Nextron Systems)