Add cmd flag to disable sgn

client/command/commands.go

@@ -1208,6 +1208,8 @@ func BindCommands(con *console.SliverConsoleClient) {
 			a.Uint("pid", "pid")
 		},
 		Flags: func(f *grumble.Flags) {
+			f.Bool("S", "disable-sgn", true, "disable shikata ga nai shellcode encoder")
+
 			f.Int("t", "timeout", defaultTimeout, "command timeout in seconds")
 		},
 		HelpGroup: consts.SliverWinHelpGroup,

client/command/exec/execute-shellcode.go

@@ -81,7 +81,7 @@ func ExecuteShellcodeCmd(ctx *grumble.Context, con *console.SliverConsoleClient)
 			Data:         shellcodeBin,
 		})
 		if err != nil {
-			con.PrintErrorf("%s\n", err.Error())
+			con.PrintErrorf("%s\n", err)
 			return
 		}
 		oldSize := len(shellcodeBin)

client/command/exec/migrate.go

@@ -3,14 +3,17 @@ package exec
 /*
 	Sliver Implant Framework
 	Copyright (C) 2019  Bishop Fox
+
 	This program is free software: you can redistribute it and/or modify
 	it under the terms of the GNU General Public License as published by
 	the Free Software Foundation, either version 3 of the License, or
 	(at your option) any later version.
+
 	This program is distributed in the hope that it will be useful,
 	but WITHOUT ANY WARRANTY; without even the implied warranty of
 	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 	GNU General Public License for more details.
+
 	You should have received a copy of the GNU General Public License
 	along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
@@ -35,11 +38,15 @@ func MigrateCmd(ctx *grumble.Context, con *console.SliverConsoleClient) {
 	config := con.GetActiveSessionConfig()
 	ctrl := make(chan bool)
 	con.SpinUntil(fmt.Sprintf("Migrating into %d ...", pid), ctrl)
+	encoder := clientpb.ShellcodeEncoder_SHIKATA_GA_NAI
+	if ctx.Flags.Bool("disable-sgn") {
+		encoder = clientpb.ShellcodeEncoder_NONE
+	}
 	migrate, err := con.Rpc.Migrate(context.Background(), &clientpb.MigrateReq{
 		Pid:     uint32(pid),
 		Config:  config,
 		Request: con.ActiveTarget.Request(ctx),
-		Encoder: clientpb.ShellcodeEncoder_SHIKATA_GA_NAI,
+		Encoder: encoder,
 	})
 	ctrl <- true
 	<-ctrl