```c#
Random random = new Random();
return string.Format("{0}{1}:{2}{3}:{4}{5}:{6}{7}:{8}{9}:{10}{11}", new object[]
{
random.Next(0, 16).ToString("x"),
"6",
random.Next(0, 16).ToString("x"),
random.Next(0, 16).ToString("x"),
random.Next(0, 16).ToString("x"),
random.Next(0, 16).ToString("x"),
random.Next(0, 16).ToString("x"),
random.Next(0, 16).ToString("x"),
random.Next(0, 16).ToString("x"),
random.Next(0, 16).ToString("x"),
random.Next(0, 16).ToString("x"),
random.Next(0, 16).ToString("x")
}).ToLower();
```
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