285. That's How Stealit Hides PowerShell Window

Hello everyone!

Adversaries often hide command and scripting interpreter's windows to use such tools silently. Today we'll look at a creative way of implementing Hide Artifacts: Hidden Window (T1564.003).

Let's look at Stealit. To hide PowerShell window the malware leverages the folowing command:

"powershell.exe -NoProfile -Command " Add-Type -Name Window -Namespace Console -MemberDefinition ' [DllImport(\"Kernel32.dll\")] public static extern IntPtr GetConsoleWindow(); [DllImport(\"user32.dll\")] public static extern bool ShowWindow(IntPtr hWnd, Int32 nCmdShow); '; $consolePtr = [Console.Window]::GetConsoleWindow(); [Console.Window]::ShowWindow($consolePtr, 0); ""

Interesting, right? And definitely worth a query:

event_type: "processcreatewin"

AND

proc_file_path: "powershell.exe"

AND

cmdline: ("GetConsoleWindow" AND "ShowWindow")

See you tomorrow!

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