feat: add emerging threats rule related to MOVEit Transfer exploitati…

…on (#4281)

rules-emerging-threats/2023/Exploits/MOVEit-Transfer-Unknown-Exploit/README.md

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+# MOVEit Transfer Critical Vulnerability (May 2023)
+
+## Summary
+
+Progress has discovered a vulnerability in MOVEit Transfer that could lead to escalated privileges and potential unauthorized access to the environment.
+
+You can find more information on the threat in the following articles:
+
+- [New MOVEit Transfer zero-day mass-exploited in data theft attacks](https://www.bleepingcomputer.com/news/security/new-moveit-transfer-zero-day-mass-exploited-in-data-theft-attacks/)
+- [MOVEit Transfer Critical Vulnerability (May 2023)](https://community.progress.com/s/article/MOVEit-Transfer-Critical-Vulnerability-31May2023)
+- [Rapid7 Observed Exploitation of Critical MOVEit Transfer Vulnerability](https://www.rapid7.com/blog/post/2023/06/01/rapid7-observed-exploitation-of-critical-moveit-transfer-vulnerability/)
+
+## Rules
+
+- [Potential MOVEit Transfer Exploitation](./file_event_win_exploit_other_moveit_transfer.yml)

rules-emerging-threats/2023/Exploits/MOVEit-Transfer-Unknown-Exploit/file_event_win_exploit_other_moveit_transfer.yml

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+title: Potential MOVEit Transfer Exploitation
+id: c3b2a774-3152-4989-83c1-7afc48fd1599
+status: experimental
+description: |
+    Detects the creation of files with unexpected extensions in the web root folder of the MOVEit Transfer service.
+    Reports mentioned uncommon file types in the "wwwroot" folder as a sign of potential compromise. Attackers used that folder as a staging directory for the exfiltration.
+references:
+    - https://www.bleepingcomputer.com/news/security/new-moveit-transfer-zero-day-mass-exploited-in-data-theft-attacks/
+    - https://community.progress.com/s/article/MOVEit-Transfer-Critical-Vulnerability-31May2023
+    - https://www.rapid7.com/blog/post/2023/06/01/rapid7-observed-exploitation-of-critical-moveit-transfer-vulnerability/
+    - https://www.reddit.com/r/sysadmin/comments/13wxuej/comment/jmhdg55/
+author: Florian Roth (Nextron Systems)
+date: 2023/06/01
+tags:
+    - attack.initial_access
+    - attack.t1190
+logsource:
+    category: file_event
+    product: windows
+detection:
+    selection_generic:
+        TargetFilename|contains: '\MOVEit Transfer\wwwroot\'
+        TargetFilename|endswith:
+            - '.7z'
+            - '.bat'
+            - '.dll'
+            - '.exe'
+            - '.ps1'
+            - '.rar'
+            - '.vbe'
+            - '.vbs'
+            - '.zip'
+    selection_known_ioc:
+        TargetFilename|endswith: '\MOVEit Transfer\wwwroot\human2.aspx'
+    condition: 1 of selection_*
+falsepositives:
+    - Unlikely
+level: high