Evil Corp's Child 1, 2 and 3

Evil Corp's Child 1:

Briefing:

What is the MD5 hash of the Windows executable file?

NOTE: If you extract any files within this challenge, please delete the file after you have completed the

Link to pcap file:

link: https://tinyurl.com/y3oltdh5
password: hacktober

Right so they started off easy. Opening up the pcap I used the http display filter to show packets of this protocol:

Opening up the details for the first packet, we can see the full request URL at http://www.sinotes.com/wp-content/themes/avada/picture4.png. I then ran wgethttp://www.sinotes.com/wp-content/themes/avada/picture4.pngto download the file. As the brief suggests, this is not a png but rather a windows executable. Therefore renaming it to ecorp.exe and running the command md5sum ecorp.exe gives us the flag of flag{a95d24937acb3420ee94493db298b295}.

Evil Corp's Child 2:

Briefing:

The malware uses four different ip addresses and ports for communication, what IP uses the same port as https?  Submit the flag as: flag{ip address}.

Use the file from Evil Corp's Child.

Here, we need to use some display filters to refine our search. Firstly, we know it uses the same port as HTTPS. This is port 443. Secondly, We're talking about the malware and know that the infected client's ip is 192.168.1.91 from challenge 1. Putting this into a display filter would look like this:

Although there are quite a few packets, there are only so many different ips, so trying about 5 got me the correct answer, which was flag{213.136.94.177} .

Evil Corp's Child 3:

Briefing:

What is the localityName in the Certificate Issuer data for HTTPS traffic to 37.205.9.252?

Use the file from Evil Corp's Child.

This was an interesting one. After some googling, I found out that Certificates are sent during tls handshakes, as TLS is used to encrypt HTTP traffic, making it HTTPS. The Display filter i needed to show these packets was tls.handshake.type == 11.

As said in the brief, we need the packet from the source IP 37.205.9.252 . Therefore expaning this packet's details, then TLSv1.2 Record Layer: Handshake Protocol: Certificate then Handshake Protocol: Certificate then Certificates then subject: rdnSequence (0) finally gives us the LocalityName.

In the bottom right is the LocalityName

flag{Mogadishu}

By das :)