Powershell Fileless Process Injection Via Getprocaddress

Powershell Fileless Process Injection Via Getprocaddress

Description

The following analytic utilizes PowerShell Script Block Logging (EventCode=4104) to identify suspicious PowerShell execution. Script Block Logging captures the command sent to PowerShell, the full command to be executed. Upon enabling, logs will output to Windows event logs. Dependent upon volume, enable no critical endpoints or all. \ This analytic identifies GetProcAddress in the script block. This is not normal to be used by most PowerShell scripts and is typically unsafe/malicious. Many attack toolkits use GetProcAddress to obtain code execution. \ In use, $var_gpa = $var_unsafe_native_methods.GetMethod(GetProcAddress and later referenced/executed elsewhere. \ During triage, review parallel processes using an EDR product or 4688 events. It will be important to understand the timeline of events around this activity. Review the entire logged PowerShell script block.

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Powershell Fileless Process Injection Via Getprocaddress Help

To successfully implement this analytic, you will need to enable PowerShell Script Block Logging on some or all endpoints. Additional setup here https://docs.splunk.com/Documentation/UBA/5.0.4.1/GetDataIn/AddPowerShell#ConfiguremoduleloggingforPowerShell.

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