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BOF.NET improvements #15

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BOF.NET improvements #15

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198a1b4
bofnet tweaks
nurfed1 Sep 18, 2022
7057509
README
nurfed1 Sep 18, 2022
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3 changes: 2 additions & 1 deletion README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -180,8 +180,9 @@ Following Cobalt Strike commands are available:
| `stracciatella-timeout <milliseconds>` | adjusts default named pipe read timeout |
| `bofnet_loadstracciatella` | loads Stracciatella.exe into BOF.NET (if one is used) |
| `bofnet_stracciatella <command>` | (non-blocking) Runs Powershell commands in a safe Stracciatella runspace via BOF.NET `bofnet_jobassembly` |
| `bofnet_stracciatella_script <scriptpath> <command>` | (non-blocking) Preloads a specified Powershell script and launches given command with parameters via BOF.NET `bofnet_jobassembly` |
| `bofnet_executestracciatella <command>` | (blocking) Runs Powershell commands in a safe Stracciatella runspace via BOF.NET `bofnet_executeassembly` |
| `bofnet_stracciatella_script <scriptpath> <command>` | Preloads a specified Powershell script and launches given command with parameters (via BOF.NET) |
| `bofnet_executestracciatella_script <scriptpath> <command>`| (blocking) Preloads a specified Powershell script and launches given command with parameters via BOF.NET `bofnet_executeassembly` |


One of the strategies for working with Stracciatella could be to configure a long enough pipe read timeout (1), launch it on a remote machine (2) thus having option for lateral movement over named pipe with a litle help of Stracciatella.
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59 changes: 50 additions & 9 deletions stracciatella.cna
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Expand Up @@ -62,15 +62,20 @@ beacon_command_register(
"(non-blocking) Runs Powershell commands in a safe Stracciatella runspace via BOF.NET bofnet_jobassembly",
"Use: bofnet_stracciatella [-v] <command>\n\nDescription: Runs Stracciatella via bofnet_jobassembly (if one is used).\nIf '-v' is given, will result in verbose output from Stracciatella.\nThat will create a Powershell Runspace with Script Block logging and AMSI disabled for better OPSEC.");

beacon_command_register(
"bofnet_stracciatella_script",
"(non-blocking) Preloads a specified Powershell script and launches given command with parameters via BOF.NET bofnet_jobassembly",
"Use: bofnet_stracciatella_script [-v] <scriptpath> <command>\n\nDescription: This function at a single run preloads a specified custom\nPowershell script and adds separator (semicolon) followed by <command> to run.\nUseful when we need to provide a Powershell script that for instance reflectively loads .NET assembly (Import-Module)\nand then we need to invoke that loaded module.\nStracciatella will be loaded via bofnet_jobassembly");

beacon_command_register(
"bofnet_executestracciatella",
"(blocking) Runs Powershell commands in a safe Stracciatella runspace via BOF.NET bofnet_executeassembly",
"Use: bofnet_stracciatella [-v] <command>\n\nDescription: Runs Stracciatella via bofnet_executeassembly (if one is used).\nIf '-v' is given, will result in verbose output from Stracciatella.\nThat will create a Powershell Runspace with Script Block logging and AMSI disabled for better OPSEC.");

beacon_command_register(
"bofnet_stracciatella_script",
"Preloads a specified Powershell script and launches given command with parameters (via BOF.NET).",
"Use: bofnet_stracciatella_script <scriptpath> <command>\n\nDescription: This function at a single run preloads a specified custom\nPowershell script and adds separator (semicolon) followed by <command> to run.\nUseful when we need to provide a Powershell script that for instance reflectively loads .NET assembly (Import-Module)\nand then we need to invoke that loaded module.\nStracciatella will be loaded via bofnet_jobassembly");
"bofnet_executestracciatella_script",
"(blocking) Preloads a specified Powershell script and launches given command with parameters via BOF.NET bofnet_executeassembly",
"Use: bofnet_executestracciatella_script [-v] <scriptpath> <command>\n\nDescription: This function at a single run preloads a specified custom\nPowershell script and adds separator (semicolon) followed by <command> to run.\nUseful when we need to provide a Powershell script that for instance reflectively loads .NET assembly (Import-Module)\nand then we need to invoke that loaded module.\nStracciatella will be loaded via bofnet_executeassembly");


$has_bofnet_commands = false;
Expand Down Expand Up @@ -375,13 +380,16 @@ sub runStracciatella {
$msg = "with imported script ( $+ " . getFileName(%IMPORTED_SCRIPTS[$1]) . " $+ )";
}
}
if(strlen($enc) >= 20000 && $mode == true && $job == $false) {
berror($1, "bofnet_executestracciatella_script does not accept compressed scripts larger then 20000 bytes. The current compressed script is " . strlen($enc) . " bytes ");
} else {
if($machine eq ".") {
executeAssembly($1, $STRACCIATELLA_PATH, $opts, $firstScriptBytes, $msg, $mode, $job);
}

if($machine eq ".") {
executeAssembly($1, $STRACCIATELLA_PATH, $opts, $firstScriptBytes, $msg, $mode, $job);
}

if(strlen($enc) >= 20000) {
writePipe($1, $machine, $pipename, $enc);
if(strlen($enc) >= 20000) {
writePipe($1, $machine, $pipename, $enc);
}
}
}

Expand Down Expand Up @@ -576,6 +584,39 @@ alias bofnet_stracciatella_script {
$customScript = substr($args, 0, $pos);
$args = substr($args, $pos + 1);

$pipename = [java.util.UUID randomUUID];
runStracciatella($1, $verbose, ".", $pipename, $args, $customScript, true, true);
}

alias bofnet_executestracciatella_script {
local('$args0 $args $verbose $pipename');

if($has_bofnet_commands == false) {
berror($1, "There is no BOF.NET loaded in Cobalt Strike. Try (re-)loading bofnet.cna and stracciatella.cna before using this.");
return;
}

$args0 = substr($0, strlen("bofnet_executestracciatella_script "));
$args = $args0;

println("bofnet_executestracciatella_script $args0");

$verbose = "";
if ('bofnet_executestracciatella_script -v *' iswm $0) {
$verbose = "-v ";
$args = substr($0, strlen("bofnet_executestracciatella_script -v "));
}

$pos = indexOf($args, " ", 0);

if(($pos is $null) || ($pos + 1) > strlen($args)) {
berror($1, "Usage: bofnet_executestracciatella_script [-v] <path> <command>\n\nNo path or command specified to run stracciatella with preloaded custom script.");
return;
}

$customScript = substr($args, 0, $pos);
$args = substr($args, $pos + 1);

$pipename = [java.util.UUID randomUUID];
runStracciatella($1, $verbose, ".", $pipename, $args, $customScript, true, false);
}
Expand Down