Hi due to recent worldwide exploitation of exchange servers, we will implement monitoring for our exchange server.
What we need:
1. Rule is based on process creation events. For that we need to collect sysmon event ID 1, windows security event ID 4688 or EDR events related to process creation (Elastic agent save this events under event.category:process and event.type:start).
2. Logs in index or alias what pass wildcard name winlogbeat-*
3. Running elastic stack instance (how to deply elasticsearch and kibana)
There is sigma rule available to download and process for our needs:
https://github.com/SigmaHQ/sigma/blob/master/rules/windows/process_creation/win_webshell_detection.yml
I will use https://uncoder.io/ portal to convert rule to elastic siem rule.
Steps:
1. Copy raw content of rule from github
2. Make sure on left panel you have selected "SIGMA".
3. Paste content to left panel
4. Over right panel from drop down menu select "Elastic Rule"
5. Click red button "Translate"
6. Click button "Copy" to copy content to clipboard.
7. Save content to file with name "Webshell Detection With Command Line Keywords.ndjson"
8.Open file with any text editor. Join all lines in one line. In notepad++ just press CTRL+J.
Important:
If you are not transforming your data by your custom ingest pipelines it is important to change all ".keyword" to empty string. In notepad++ just press CTRL+H.
9. Open elastic siem web application.
10. Navigate with dropdown menu to security->Alerts
11. On right side enter to rule manager by clicking button "Manage detection rules": 
12. Click "Import rules" button:
13. Click in the middle of the window to choose file with the rule.
14. Click "import rule" button.
After that rule is imported and enabled:
How this rule works:
Rule check if there was ran process where parent executable process ends with one of (w3wp.exe, php-cgi.exe, nginx.exe, httpd.exe, apache, tomcat) and:
a) process executable ends with one of net.exe, net1.exe and process has at least on of user, use, group in arguments
b) process executable ends with ping.exe and has in arguments -n
c) process arguments has one of (&cd&echo, "cd /d")
d) process executable ends with wmic.exe and has in arguments "/node:"
e) process executable ends with one of (whoami.exe, systeminfo.exe, quser.exe, ipconfig.exe, pathping.exe, tracert.exe, netstat.exe, schtasks.exe, vssadmin.exe, wevtutil.exe, tasklist.exe)
f) process arguments has one of (Test-NetConnection, dir)
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