Suspicious HH.EXE Execution

A Sigma rule for process creation on Windows, by Maxim Pavlunin.

high 11 ATT&CK techniques 1 program it names

What it looks for

its detection, as SigmaHQ writes it

detection:
  selection_img:
    - OriginalFileName: 'HH.exe'
    - Image|endswith: '\hh.exe'
  selection_paths:
    CommandLine|contains:
      - '.application'
      - '\AppData\Local\Temp\'
      - '\Content.Outlook\'
      - '\Downloads\'
      - '\Users\Public\'
      - '\Windows\Temp\'
  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 Maxim Pavlunin, 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

hh.exe

ATT&CK

the techniques it is tagged with

T1047Windows Management Instrumentation

T1059.001Command and Scripting Interpreter: PowerShell

T1059.003Command and Scripting Interpreter: Windows Command Shell

T1059.005Command and Scripting Interpreter: Visual Basic

T1059.007Command and Scripting Interpreter: JavaScript

T1218System Binary Proxy Execution

T1218.001System Binary Proxy Execution: Compiled HTML File

T1218.010System Binary Proxy Execution: Regsvr32

T1218.011System Binary Proxy Execution: Rundll32

T1566Phishing

T1566.001Phishing: Spearphishing Attachment

Suspicious HH.EXE Execution

What it looks for

Programs and files it names

ATT&CK

Other rules for T1047 Windows Management Instrumentation