Error With Ampersand Character in Stager

[p3nt4]

Empire Version

2.3

Expected behavior and description of the error, including any actions taken immediately prior to the error. The more detail the better.

Hi, I am trying to launch an empire stager through powershell runspaces in c#
(https://github.com/p3nt4/PowerShdll).

rundll32 Powershdll.dll,main $a = [System.Text.Encoding]::ASCII.GetString([System.Convert]::FromBase64String("BASE64LAUNCHER")); Invoke-Expression $a

The ampersand in the stager is causing an error (please see below).

Is it possible to replace that symbol by a command?

Screenshot of error, embedded text output, or Pastebin link to the error

At line:1 char:2939
+ ... . . $ d A T a . l E N g t H ] ; - J o I n [ C h a r [ ] ] ( &   $ R   ...
+                                                                 ~
The ampersand (&) character is not allowed. The & operator is reserved for future use; wrap an ampersand in double quotation marks ("&") to pass it as part of a string.

Any additional information

This is not an Empire issue per say but any help would be appreciated.
Thank you.

[xorrior]

@p3nt4 You try escaping with ` .

[p3nt4]

Thanks @xorrior for the reply. Escaping the ampersand does not work.
Decoding as ASCII caused the error. Using UNICODE did the trick.