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Detecting Sysmon on the Victim Host
Exploring ways to detect Sysmon presence on the victim system
attacker@victim
PS C:\> Get-Process | Where-Object { $_.ProcessName -eq "Sysmon" }
Note: process name can be changed during installation
attacker@victim
Get-CimInstance win32_service -Filter "Description = 'System Monitor service'"
# or
Get-Service | where-object {$_.DisplayName -like "*sysm*"}
Note: display names and descriptions can be changed
attacker@victim
reg query HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\WINEVT\Channels\Microsoft-Windows-Sysmon/Operational
attacker@victim
PS C:\> fltMC.exe
Note how even though you can change the sysmon service and driver names, the sysmon altitude is always the same -
385201
attacker@victim
ls HKCU:\Software\Sysinternals
Once symon executable is found, the config file can be checked like so:
sysmon -c
If you are lucky enough, you may be able to find the config file itself on the disk by using native windows utility findstr:
attcker@victim
findstr /si '<ProcessCreate onmatch="exclude">' C:\tools\*
A powershell tool by @mattifestation that extracts sysmon rules from the registry:
attacker@victim
PS C:\tools> (Get-SysmonConfiguration).Rules
As an example, looking a bit deeper into the
ProcessCreate rules:attacker@victim
(Get-SysmonConfiguration).Rules[0].Rules
We can see the rules almost as they were presented in the sysmon configuration XML file:
A snippet from the actual sysmonconfig-export.xml file:
Since Get-SysmonConfiguration gives you the ability to see the rules sysmon is monitoring on, you can play around those.
Another way to bypass the sysmon altogether is explored here:
