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Detectioninformationaltest

New PowerShell Instance Created

Detects the execution of PowerShell via the creation of a named pipe starting with PSHost

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Launch
Roberto Rodriguez (Cyb3rWard0g), OTR (Open Threat Research)Created Thu Sep 12Updated Thu Nov 30ac7102b4-9e1e-4802-9b4f-17c5524c015cwindows
Log Source
WindowsNamed Pipe Created
ProductWindows← raw: windows
CategoryNamed Pipe Created← raw: pipe_created

Definition

Note that you have to configure logging for Named Pipe Events in Sysmon config (Event ID 17 and Event ID 18). The basic configuration is in popular sysmon configuration (https://github.com/SwiftOnSecurity/sysmon-config), but it is worth verifying. You can also use other repo, e.g. https://github.com/Neo23x0/sysmon-config, https://github.com/olafhartong/sysmon-modular. How to test detection? You can check powershell script from this site https://svch0st.medium.com/guide-to-named-pipes-and-hunting-for-cobalt-strike-pipes-dc46b2c5f575

Detection Logic
Detection Logic1 selector
detection:
    selection:
        PipeName|startswith: '\PSHost'
    condition: selection
False Positives

Likely

References
1
Resolving title…
threathunterplaybook.com
2
Resolving title…
threathunterplaybook.com
MITRE ATT&CK
Related Rules
DerivedDetectionmedium

Alternate PowerShell Hosts Pipe

Detects alternate PowerShell hosts potentially bypassing detections looking for powershell.exe

This rule was derived from the related rule - both detect similar activity with different scope.

Rule Metadata
Rule ID
ac7102b4-9e1e-4802-9b4f-17c5524c015c
Status
test
Level
informational
Type
Detection
Created
Thu Sep 12
Modified
Thu Nov 30
Author
Roberto Rodriguez (Cyb3rWard0g), OTR (Open Threat Research)
Path
rules/windows/pipe_created/pipe_created_powershell_execution_pipe.yml
Raw Tags
attack.executionattack.t1059.001
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