CmdID / Rules / Windows

New Self Extracting Package Created Via IExpress.EXE

A Sigma rule for process creation on Windows, from SigmaHQ’s threat hunting rules, by Joseliyo Sanchez, @Joseliyo_Jstnk.

medium 1 ATT&CK technique 3 programs it names 3 everyday examples trip it

What it looks for

its detection, as SigmaHQ writes it

detection:
  selection_1_img:
    - Image|endswith: '\makecab.exe'
    - OriginalFileName: 'makecab.exe'
  selection_1_parent:
    ParentImage|endswith: '\iexpress.exe'
  selection_2_cli:
    CommandLine|contains: ' /n '
  selection_2_img:
    - Image|endswith: '\iexpress.exe'
    - OriginalFileName: 'IEXPRESS.exe'
  condition: all of selection_1_* or all of selection_2_*

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 Joseliyo Sanchez, @Joseliyo_Jstnk, 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.

Command lines that trip it

everyday examples from tldr-pages, CC BY 4.0, each read by CmdID

Build a self-extracting ZIP archive from a given SED file on the page for iexpress

iexpress /n path\to\file.sedIdentify

Run the build process in a minimized window on the page for iexpress

iexpress /n /m path\to\file.sedIdentify

Run the build process in a quiet mode, assuming the user account invoking this command as an administrator or regular user on the page for iexpress

iexpress /n /q:a path\to\file.sedIdentify

Programs and files it names

their pages here

makecab.exeiexpressiexpress.exe

ATT&CK

the techniques it is tagged with

T1218System Binary Proxy Execution

New Self Extracting Package Created Via IExpress.EXE

What it looks for

Command lines that trip it

Programs and files it names

ATT&CK

Other rules for T1218 System Binary Proxy Execution