Rundll32 InstallScreenSaver Execution

A Sigma rule for process creation on Windows, by Christopher Peacock @securepeacock, SCYTHE @scythe_io, TactiKoolSec.

medium 1 ATT&CK technique 1 program it names

What it looks for

its detection, as SigmaHQ writes it

detection:
  selection_cli:
    CommandLine|contains: 'InstallScreenSaver'
  selection_img:
    - Image|endswith: '\rundll32.exe'
    - OriginalFileName: 'RUNDLL32.EXE'
  condition: all of 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 Christopher Peacock @securepeacock, SCYTHE @scythe_io, TactiKoolSec, 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

documented abuse, read by CmdID

The commands LOLBAS or GTFOBins documents for desk.cpl trip it: each is on its program’s page, read by CmdID.

Programs and files it names

their pages here

rundll32.exe

ATT&CK

the techniques it is tagged with

T1218.011System Binary Proxy Execution: Rundll32

Rundll32 InstallScreenSaver Execution

What it looks for

Command lines that trip it

Programs and files it names

ATT&CK

Other rules for T1218.011 System Binary Proxy Execution: Rundll32