From b8ee736f4484ec86e23a5016bd9c634c909b8e33 Mon Sep 17 00:00:00 2001
From: Sander Wiebing <45387038+SanWieb@users.noreply.github.com>
Date: Sun, 24 May 2020 15:16:07 +0200
Subject: [PATCH] Remove AppData folder as suspicious folder

A lot of software is using the AppData folder for startup keys. Some examples:
- Microsoft Teams (\AppData\Local\Microsoft\Teams)
- Resilio (\AppData\Roaming\Resilio Sync\)
- Discord ( (\AppData\Local\Discord\)
- Spotify ( (\AppData\Roaming\Spotify\)

Too many to whitelist them all
---
 .../sysmon/sysmon_susp_run_key_img_folder.yml       | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/rules/windows/sysmon/sysmon_susp_run_key_img_folder.yml b/rules/windows/sysmon/sysmon_susp_run_key_img_folder.yml
index 6f6c9f6b4..43c5990a1 100644
--- a/rules/windows/sysmon/sysmon_susp_run_key_img_folder.yml
+++ b/rules/windows/sysmon/sysmon_susp_run_key_img_folder.yml
@@ -4,12 +4,12 @@ status: experimental
 description: Detects suspicious new RUN key element pointing to an executable in a suspicious folder
 references:
     - https://www.fireeye.com/blog/threat-research/2018/08/fin7-pursuing-an-enigmatic-and-evasive-global-criminal-operation.html
-author: Florian Roth, Markus Neis
+author: Florian Roth, Markus Neis, Sander Wiebing
 tags:
     - attack.persistence
     - attack.t1060
 date: 2018/08/25
-modified: 2020/02/26
+modified: 2020/05/24
 logsource:
     product: windows
     service: sysmon
@@ -21,8 +21,6 @@ detection:
             - '*\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\\*'
         Details:
             - '*C:\Windows\Temp\\*'
-            - '*\AppData\\*'
-            - '%AppData%\\*'
             - '*C:\$Recycle.bin\\*'
             - '*C:\Temp\\*'
             - '*C:\Users\Public\\*'
@@ -31,12 +29,9 @@ detection:
             - '*C:\Users\Desktop\\*'
             - 'wscript*'
             - 'cscript*'
-    filter:
-        Details|contains:
-          - '\AppData\Local\Microsoft\OneDrive\'  # OneDrive False Positives
-    condition: selection and not filter
+    condition: selection
 fields:
     - Image
 falsepositives:
-    - Software using the AppData folders for updates
+    - Software using weird folders for updates
 level: high