Contextifier

What is this?

If you are investigating an attack on a website you spend a lot of time searching through log files to find the nuggets of useful information from the sea of noise.

This tool extracts IP addresses and frequency from any type of structured or unstructured log file.

Usage

./contextifier [path_to_log_file] [path_to_exclusion_file]

Example

./contextifier /var/log/apache2/access.log /usr/local/etc/exclude_ranges.txt

Output

The output is a list of IP addresses and the number of times they appear in the log file. For example:

66.248.202.37        153        https://wafris.org/ip-lookup/66.248.202.37
185.93.228.37        94         https://wafris.org/ip-lookup/185.93.228.37
185.93.230.37        75         https://wafris.org/ip-lookup/185.93.230.37
192.88.134.37        55         https://wafris.org/ip-lookup/192.88.134.37
185.93.229.37        38         https://wafris.org/ip-lookup/185.93.229.37
208.109.1.37         22         https://wafris.org/ip-lookup/208.109.1.37
66.248.203.37        20         https://wafris.org/ip-lookup/66.248.203.37
66.248.200.37        16         https://wafris.org/ip-lookup/66.248.200.37
192.88.135.37        16         https://wafris.org/ip-lookup/192.88.135.37
109.147.188.246      12         https://wafris.org/ip-lookup/109.147.188.246
97.134.99.54         11         https://wafris.org/ip-lookup/97.134.99.54
209.85.238.171       10         https://wafris.org/ip-lookup/209.85.238.171

Excluding Ranges

The exclude_ranges.txt file is a list of CIDR ranges that you want to exclude from the output. This is useful for removing known good IP addresses from the output, proxies, internal networks, etc.

Add your own CIDR ranges to be excluded one per line. For example:

Akamai IP Ranges

23.0.0.0/12  
23.192.0.0/11  
23.32.0.0/11  
23.64.0.0/14  
23.72.0.0/13  
69.192.0.0/16  
72.246.0.0/15  
88.221.0.0/16  
92.122.0.0/15
95.100.0.0/15  
96.16.0.0/15  
96.6.0.0/15  
104.64.0.0/10  
118.214.0.0/16  
173.222.0.0/15  
184.24.0.0/13  
184.50.0.0/15  
184.84.0.0/14
2a02:26f0::/32  
2600:1400::/24  
2405:9600::/32

Cloudflare IP Ranges

103.21.244.0/22
103.22.200.0/22
103.31.4.0/22
141.101.64.0/18
108.162.192.0/18
190.93.240.0/20
188.114.96.0/20
197.234.240.0/22
198.41.128.0/17
162.158.0.0/15
104.16.0.0/13
104.24.0.0/14
172.64.0.0/13
131.0.72.0/22
2400:cb00::/32
2606:4700::/32
2803:f800::/32
2405:b500::/32
2405:8100::/32
2a06:98c0::/29
2c0f:f248::/32

Sucuri IP Ranges

185.93.228.0/22 
66.248.200.0/22 
2a02:fe80::/29 
208.109.0.0/22

Private IPv4 Ranges

172.16.0.0/12
192.168.0.0/16

IP Lookup Integration

Each IP in the report is linked to a comprehensive reputation report on IP Lookup for further investigation.

/*

MIT License

Copyright (c) [2024] [Michael J Buckbee]

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

*/