Didier Stevens

I needed an email server simulator to test a script I’m writing (a simple email honeypot), and found GreenMail.

It’s a Java application and can thus run on Windows too:

This is the command I used:

java -Dgreenmail.setup.test.all -Dgreenmail.users=testuser1:P#ssw0rd@example.com,testuser2:P#ssw0rd@example.com -Dgreenmail.verbose -Dgreenmail.auth.disabled -jar greenmail-standalone-1.5.7.jar

This command starts all servers (SMTP, POP3, IMAP) on the default ports + 3000 (3025, 3110, …).

I configured 2 user mailboxes, enabled verbosity and disabled authentication.

To send emails to my script, I used Outlook:

Since everything is running on the same machine using localhost (127.0.0.1), I’m using Npcap so that I can capture loopback traffic with Wireshark (WinPcap can not capture loopback traffic).

Quickpost info

I like to be able to get work done, regardless of the machine I’m using. That’s why I installed Suricata on Windows to help me develop rules.

Here is the process:

Installing Suricata with default settings:

Now that I installed Suricata in the programs folder, I’m going to create a folder with my configurations, rules and test captures. Let’s say that folder is C:\Suricata.

In that folder, I create folders log, rules and projects.

In folder rules, I copy the content of the rules folder in the Suricata programs directory.

threshold.config is an empty file, and suricata.yaml is a copy of suricata.yaml found inside the Suricata programs directory.

You can find the modifications I make to suricata.yaml on GitHub. Of course, you can make more configuration changes, this is just a minimum.

Then, for each project or test, I create a folder in folder projects. Like this mimikatz folder:

I use the following BAT file to start Suricata with my rules and my capture file:

“C:\Program Files (x86)\Suricata\suricata.exe” -c ..\..\suricata.yaml -S mimikatz.rules -l logs -k none -v -r drsuapi-DsGetNCChanges.pcap
pause

With option -S I use my rule file mimikatz.rules (exclusively, no other rule file will be loaded), option -l logs uses my local logs directory to write the log files, -k none disable checksum checks, -v means verbose and -r .pcap reads my capture file for processing by Suricata.

If you get this error:

you need to install WinPcap. Here is the installation with default options:

Then you will get output like this:

When you use option -s in stead of -S, your rule will be loaded together with the rules configured in the configuration file. This will give you warnings, because the rule files are missing:

You can download rules from Emerging Threats and extract the files from the rules folder to your C:\Suricata\rules folder.

Of course, you can also process your capture file without explicit rule:

Please post a comment if you want to share your own preferred configuration options.

Quickpost info

Here’s how I used nmap with Tallow on Windows, a transparent Tor proxy:

ICMP is not supported by the Tor network (hence -Pn) neither SYN scanning (hence TCP scanning -sT).

Flag “Force web-only” blocks all ports except 80 and 443, hence why port 22 is filtered.

Quickpost info