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https://github.com/devanshbatham/CertEagle

Weaponizing Live CT logs for automated monitoring of assets
https://github.com/devanshbatham/CertEagle

asset-monitoring bughunting cybersecurity osint reconnaissance ssl-certificates subdomain-enumeration subdomain-finder subdomain-monitor

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Weaponizing Live CT logs for automated monitoring of assets

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## CertEagle - Asset monitoring utility using real time CT log feeds

![certeagle](https://raw.githubusercontent.com/devanshbatham/CertEagle/master/static/logo.PNG)



### Detailed Description about this can be found here :

Read Blog here : https://medium.com/@Asm0d3us/weaponizing-live-ct-logs-for-automated-monitoring-of-assets-39c6973177c7



### Introduction

In Bugbounties “**If you are not first , then you are last**” there is no such thing as silver or a bronze medal , Recon plays a very crucial part and if you can detect/Identify a newly added asset earlier than others then the chances of you Finding/Reporting a security flaw on that asset and getting rewarded for the same are higher than others.



Personally I am monitoring CT logs for domains/subdomains for quite a long time now and it gave me a lot of successful results , The inspiration behind this was “[Sublert : By yassineaboukir](https://github.com/yassineaboukir/sublert/)” which checks crt.sh for subdomains and can be executed periodically , However I am using somewhat different approach and instead of looking into crt.sh periodically, I am extracting domains from Live CT log feeds , So chances of me finding a new asset earlier is higher as compared to others.



### Workflow 

 -  Monitoring Real Time CT log feed and extracting the domain names from that feed

-   Matching the extracted subdomains/domains against the domains/Keywords to be matched

-   Sending a Slack notification if a domain name matches



#### Requirements :



-   A VPS (UNIX up and running)

-   Python 3x (Tested with Python 3.6.9)

-   Slack Workspace (optional)



### Setup 

I am assuming that you have already done with your setup of slack workspace .



Now Create a channel named “subdomain-monitor” and set up a incoming webhook



#### Enabling Slack Notifications :



Edit `config.yaml` file and paste your slack webhook URL there , It should look something like this

![config](https://raw.githubusercontent.com/devanshbatham/CertEagle/master/static/config.png)



#### Keywords and domains to match :



You can specify keywords and domains to match in `domains.yaml` file , You can specify names



**For Matching subdomains :**



![domains.yaml](https://raw.githubusercontent.com/devanshbatham/CertEagle/master/static/domains.png)

Note : Notice that preceding dot [ . ]



Lets take “.facebook.com” as example , domains extracted from Real time CT logs will be matched against the word “.facebook.com” , if matched they will be logged in our output file (found-domains.log) . The thing to note here is , It will give some false positives like “test.facebook.com.test.com” , “example.facebook.company” but we can filter out them later on by using use regex magic



#### For Matching domains/subdomains with specific keywords :



Lets assume that you want to monitor and log domains/subdomains that are having word “hackerone” in them , then our domains.yaml file will look something like this

![domains.yaml](https://raw.githubusercontent.com/devanshbatham/CertEagle/master/static/keyword.png)

Now all the extracted domains/subdomains that are having word “hackerone” in them will be matched and logged (and a slack notification will be sent to you for the same)



Okay we are done with our initial setup , Lets install the required dependencies and run our tool



`$ pip3 install -r requirements.txt`



`$ python3 certeagle.py`



![](https://raw.githubusercontent.com/devanshbatham/CertEagle/master/static/start.png)



**Matched domains will look like this :**



![](https://raw.githubusercontent.com/devanshbatham/CertEagle/master/static/output.png)



**Slack Notifications will look like this :**



![enter image description here](https://raw.githubusercontent.com/devanshbatham/CertEagle/master/static/slack.png)



**Output files :**



The program will keep on running all the matched domains will be saved under output directory in found-domains.log file



![](https://raw.githubusercontent.com/devanshbatham/CertEagle/master/static/found-domains.png)



**Strict Warning : Do not monitor assets of any organisation without prior consent**



### Inspiration 



[Sublert](https://github.com/yassineaboukir/sublert/) 



[Phishing Catcher](https://github.com/x0rz/phishing_catcher)



### Contact



Shoot my DM : [@0xAsm0d3us](https://twitter.com/0xAsm0d3us)



## __Want to support my work?__

If you think my work has added some value to your existing knowledge, then you can [Buy me a Coffee here](https://www.buymeacoffee.com/Asm0d3us) (and who doesn't loves a good cup of coffee?')



[![name](https://img.buymeacoffee.com/api/?url=aHR0cHM6Ly9jZG4uYnV5bWVhY29mZmVlLmNvbS91cGxvYWRzL3Byb2ZpbGVfcGljdHVyZXMvMjAyMS8wOS8wMGU4ZGJjODc0NzI0MmRjYTJmNGJkMmMzMzQ1ODUzZC5wbmdAMzAwd18wZS53ZWJw&creator=Asm0d3us&is_creating=creating%20educational%20cybersecurity%20related%20content.&design_code=1&design_color=%235F7FFF&slug=Asm0d3us)](https://www.buymeacoffee.com/Asm0d3us)