CmdID / Rules / Windows

Suspicious JavaScript Execution Via Mshta.EXE

A Sigma rule for process creation on Windows, by E.M. Anhaus (originally from Atomic Blue Detections, Endgame), oscd.community.

high 1 ATT&CK technique 1 program it names

What it looks for

its detection, as SigmaHQ writes it

detection:
  selection_cli:
    CommandLine|contains: 'javascript'
  selection_img:
    - Image|endswith: '\mshta.exe'
    - OriginalFileName: 'MSHTA.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 E.M. Anhaus (originally from Atomic Blue Detections, Endgame), oscd.community, 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 mshta.exe trip it: each is on its program’s page, read by CmdID.

Programs and files it names

their pages here

mshta.exe

ATT&CK

the techniques it is tagged with

T1218.005System Binary Proxy Execution: Mshta

Suspicious JavaScript Execution Via Mshta.EXE

What it looks for

Command lines that trip it

Programs and files it names

ATT&CK

Other rules for T1218.005 System Binary Proxy Execution: Mshta