Potential Baby Shark Malware Activity

A Sigma rule for process creation on Windows, from SigmaHQ’s emerging threats rules, by Florian Roth (Nextron Systems).

high 4 ATT&CK techniques 1 program it names

What it looks for

its detection, as SigmaHQ writes it

detection:
  selection:
    - CommandLine|contains|all:
        - 'powershell.exe mshta.exe http'
        - '.hta'
    - CommandLine|contains:
        - 'reg query "HKEY_CURRENT_USER\Software\Microsoft\Terminal Server Client\Default"'
        - 'cmd.exe /c taskkill /im cmd.exe'
        - '(New-Object System.Net.WebClient).UploadFile(''http'
  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 Florian Roth (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.

Programs and files it names

their pages here

powershell.exe

ATT&CK

the techniques it is tagged with

T1012Query Registry

T1059.001Command and Scripting Interpreter: PowerShell

T1059.003Command and Scripting Interpreter: Windows Command Shell

T1218.005System Binary Proxy Execution: Mshta

Potential Baby Shark Malware Activity

What it looks for

Programs and files it names

ATT&CK

Other rules for T1012 Query Registry