Detectionhightest

Powershell Install a DLL in System Directory

Uses PowerShell to install/copy a file into a system directory such as "System32" or "SysWOW64"

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François Hubaut, Nasreddine Bencherchali (Nextron Systems)Created Mon Dec 27Updated Mon Jan 2263bf8794-9917-45bc-88dd-e1b5abc0ecfdwindows

Log Source

WindowsPowerShell Script

ProductWindows← raw: windows

CategoryPowerShell Script← raw: ps_script

Definition

Requirements: Script Block Logging must be enabled

Detection Logic

detection:
    selection:
        ScriptBlockText|re: '(Copy-Item|cpi) .{2,128} -Destination .{1,32}\\Windows\\(System32|SysWOW64)'
    condition: selection

False Positives

Unknown

False positive likelihood has not been assessed. Additional context may be needed during triage.

References

Resolving title…

github.com

MITRE ATT&CK

Tactics

TA0003 · Persistence TA0005 · Defense Evasion TA0006 · Credential Access

Sub-techniques

T1556.002 · Password Filter DLL

Rule Metadata

Rule ID

63bf8794-9917-45bc-88dd-e1b5abc0ecfd

Status

test

Level

high

Type

Detection

Created

Mon Dec 27

Modified

Mon Jan 22

Author

François Hubaut, Nasreddine Bencherchali (Nextron Systems)

Path

rules/windows/powershell/powershell_script/posh_ps_copy_item_system_directory.yml

Raw Tags

attack.persistenceattack.defense-evasionattack.credential-accessattack.t1556.002

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