From e16974522b58df3fd059f3bad8d88aafaba6a2db Mon Sep 17 00:00:00 2001
From: Sittikorn S <61369934+BlackB0lt@users.noreply.github.com>
Date: Tue, 1 Feb 2022 15:19:36 +0700
Subject: [PATCH] Update sysmon_process_hollowing.yml

Update filters
---
 rules/windows/sysmon/sysmon_process_hollowing.yml | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/rules/windows/sysmon/sysmon_process_hollowing.yml b/rules/windows/sysmon/sysmon_process_hollowing.yml
index 7176fdc15..3f5fbf9b1 100644
--- a/rules/windows/sysmon/sysmon_process_hollowing.yml
+++ b/rules/windows/sysmon/sysmon_process_hollowing.yml
@@ -2,10 +2,12 @@ title: Sysmon Process Hollowing Detection
 id: c4b890e5-8d8c-4496-8c66-c805753817cd
 status: experimental
 description: Detects when a memory process image does not match the disk image, indicative of process hollowing.
-author: Christopher Peacock '@securepeacock', SCYTHE '@scythe_io'
+author: Christopher Peacock '@securepeacock', SCYTHE '@scythe_io', Sittikorn S
 date: 2022/01/25
+modified: 2022/02/01
 references:
   - https://twitter.com/SecurePeacock/status/1486054048390332423?s=20 
+  - https://www.bleepingcomputer.com/news/microsoft/microsoft-sysmon-now-detects-malware-process-tampering-attempts/
 tags:
     - attack.process_injection
     - attack.t1055.012
@@ -15,7 +17,13 @@ logsource:
 detection:
     selection:
         Type: Image is replaced
-    condition: selection 
+    filters:
+        Image|endswith:
+            - '\chrome.exe'
+            - '\opeara.exe'
+            - '\firefox.exe'
+            - '\MicrosoftEdge.exe'
+    condition: selection and not filters
 falsepositives:
     - There are no known false positives at this time
 level: high