CmdID

CmdID / Rules / Windows

Windows MSIX Package Support Framework AI_STUBS Execution

A Sigma rule for process creation on Windows, by Michael Haag, Swachchhanda Shrawan Poudel (Nextron Systems).

low 3 ATT&CK techniques

What it looks for

its detection, as SigmaHQ writes it
detection:
  selection:
    Image|endswith:
      - '\AI_STUBS\AiStubX64Elevated.exe'
      - '\AI_STUBS\AiStubX86Elevated.exe'
      - '\AI_STUBS\AiStubX64.exe'
      - '\AI_STUBS\AiStubX86.exe'
    OriginalFileName: 'popupwrapper.exe'
  condition: selection

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 Michael Haag, Swachchhanda Shrawan Poudel (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.

ATT&CK

the techniques it is tagged with
T1204.002User Execution: Malicious File
T1218System Binary Proxy Execution
T1553.005Subvert Trust Controls: Mark-of-the-Web Bypass

Other rules for T1204.002 User Execution: Malicious File

Suspicious Outlook Child Process · Suspicious Binary In User Directory Spawned From Office Application · Potential Suspicious Browser Launch From Document Reader Process · Suspicious LNK Command-Line Padding with Whitespace Characters