icacls.exe windows file and directory permissions modification

https://attack.mitre.org/techniques/T1222/001/

Image: C:\Windows\system32\icacls.exe

cmdline: ICACLS . /GRANT EVERYONE:F /T /C /Q

icacls C:\Windows\System32\config\sam

C:\Users\Avi\Desktop>cacls TestCACLS /p Users:n (n for no control)

now on the TestCACLS folder, no one can access.

C:\Users\Avi\Desktop>cacls TestCACLS /p Users:f (f for full control)

now can access.

https://ss64.com/nt/cacls.html

Check Permissions
Force Remove
THen add Read + Execute
Validate Permissions

icacls putty.exe
icacls putty.exe /deny tsa_admin:(F)
icacls putty.exe /grant:r tsa_admin:(RX)
icacls putty.exe

icacls "%WINDIR%\system32\msimg64.dll" /grant administrators:F

Detection:

windows security log events (event id 4670) are created when DACLs are modified.

Inheritance rights are represented by the following abbreviations:

OI object inherit

CI container inherit

IO inherit only

NP do not propagate inherit

NTFS permissions are represented by one of the following forms:

N no access

F full access

M modify access

R read only access

RX read and execute access

W write access

D delete access

attacker can interact with the DACLs using built-in windows commands such as, icacls, cacls, takedown, attrib which allow adversaries higher permissions on

icacls <file_name> /reset replace acls with default inherited acls. (reset permission)

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