CmdID / Rules / Windows

Potential Suspicious Execution From GUID Like Folder Names

A Sigma rule for process creation on Windows, from SigmaHQ’s threat hunting rules, by Nasreddine Bencherchali (Nextron Systems).

low 1 ATT&CK technique 2 programs it names

What it looks for

its detection, as SigmaHQ writes it

detection:
  filter_main_driver_inst:
    Image: 'C:\Windows\System32\drvinst.exe'
  filter_main_image_guid:
    Image|contains|all:
      - '\{'
      - '}\'
  filter_main_msiexec:
    Image:
      - 'C:\Windows\System32\msiexec.exe'
      - 'C:\Windows\SysWOW64\msiexec.exe'
  filter_main_null:
    Image: null
  selection_folder:
    CommandLine|contains:
      - '\AppData\Roaming\'
      - '\AppData\Local\Temp\'
  selection_guid:
    CommandLine|contains|all:
      - '\{'
      - '}\'
  condition: all of selection_* and not 1 of filter*

The rule’s detection, its selections and fields in order of name. The whole rule, with its references and false positives, is on SigmaHQ, by Nasreddine Bencherchali (Nextron Systems), under the Detection Rule License 1.1. CmdID evaluates it on a command line alone: a test on what a command line cannot show, such as the parent process or the user, is not met.

None of the everyday examples and documented commands on CmdID’s program pages trips it. To see whether a command line does, paste it into CmdID.

Programs and files it names

their pages here

msiexec.exedrvinst.exe

ATT&CK

the techniques it is tagged with

T1027Obfuscated Files or Information

Potential Suspicious Execution From GUID Like Folder Names

What it looks for

Programs and files it names

ATT&CK

Other rules for T1027 Obfuscated Files or Information