From 40dffb5c92ccc6ba98a28cfd90510a3097d37099 Mon Sep 17 00:00:00 2001
From: frack113 <62423083+frack113@users.noreply.github.com>
Date: Fri, 27 Jan 2023 10:49:58 +0100
Subject: [PATCH 1/4] Add registry_set_susp_pendingfilerenameoperations

---
 ...y_set_susp_pendingfilerenameoperations.yml | 27 +++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 rules/windows/registry/registry_set/registry_set_susp_pendingfilerenameoperations.yml

diff --git a/rules/windows/registry/registry_set/registry_set_susp_pendingfilerenameoperations.yml b/rules/windows/registry/registry_set/registry_set_susp_pendingfilerenameoperations.yml
new file mode 100644
index 000000000..6e373eef0
--- /dev/null
+++ b/rules/windows/registry/registry_set/registry_set_susp_pendingfilerenameoperations.yml
@@ -0,0 +1,27 @@
+title: Set PendingFileRenameOperations to Rename File
+id: 4eec988f-7bf0-49f1-8675-1e6a510b3a2a
+status: experimental
+description: Detect use of the PendingFileRenameOperations to rename a file in a suspicious folder.
+references:
+    - https://app.any.run/tasks/64b0ba45-e7ce-423b-9a1d-5b4ea59521e6/
+    - https://devblogs.microsoft.com/scripting/determine-pending-reboot-statuspowershell-style-part-1/
+author: frack113
+date: 2023/01/27
+tags:
+    - attack.defense_evasion
+    - attack.t1036.003 
+logsource:
+    category: registry_set
+    product: windows
+detection:
+    selection:
+        EventType: 'SetValue'
+        TargetObject|endswith: '\SYSTEM\ControlSet001\Control\SESSION MANAGER\PendingFileRenameOperations'
+        Details|contains: 
+            - '\AppData\'
+            - '\Users\Public\'
+            - '\Temp\'
+    condition: selection
+falsepositives:
+    - Unknown
+level: medium

From 0f9ce8de6056d6610b4977b7bee1ab7a1eed3923 Mon Sep 17 00:00:00 2001
From: frack113 <62423083+frack113@users.noreply.github.com>
Date: Fri, 27 Jan 2023 11:09:45 +0100
Subject: [PATCH 2/4] Update registry_set_susp_pendingfilerenameoperations.yml

---
 .../registry_set_susp_pendingfilerenameoperations.yml        | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/rules/windows/registry/registry_set/registry_set_susp_pendingfilerenameoperations.yml b/rules/windows/registry/registry_set/registry_set_susp_pendingfilerenameoperations.yml
index 6e373eef0..78394195a 100644
--- a/rules/windows/registry/registry_set/registry_set_susp_pendingfilerenameoperations.yml
+++ b/rules/windows/registry/registry_set/registry_set_susp_pendingfilerenameoperations.yml
@@ -16,11 +16,10 @@ logsource:
 detection:
     selection:
         EventType: 'SetValue'
-        TargetObject|endswith: '\SYSTEM\ControlSet001\Control\SESSION MANAGER\PendingFileRenameOperations'
+        TargetObject|endswith: '\SYSTEM\CurrentControlSet\Control\SESSION MANAGER\PendingFileRenameOperations'
         Details|contains: 
-            - '\AppData\'
+            - '\AppData\Local\Temp\'
             - '\Users\Public\'
-            - '\Temp\'
     condition: selection
 falsepositives:
     - Unknown

From 35dabc529cd9b4b46ff7dca0f13d3be552c3d598 Mon Sep 17 00:00:00 2001
From: Nasreddine Bencherchali <8741929+nasbench@users.noreply.github.com>
Date: Fri, 27 Jan 2023 13:55:19 +0100
Subject: [PATCH 3/4] fix: update metadata

---
 ...y_set_susp_pendingfilerenameoperations.yml | 26 ++++++++++++-------
 1 file changed, 17 insertions(+), 9 deletions(-)

diff --git a/rules/windows/registry/registry_set/registry_set_susp_pendingfilerenameoperations.yml b/rules/windows/registry/registry_set/registry_set_susp_pendingfilerenameoperations.yml
index 78394195a..fd4396ec6 100644
--- a/rules/windows/registry/registry_set/registry_set_susp_pendingfilerenameoperations.yml
+++ b/rules/windows/registry/registry_set/registry_set_susp_pendingfilerenameoperations.yml
@@ -1,26 +1,34 @@
-title: Set PendingFileRenameOperations to Rename File
+title: Potential PendingFileRenameOperations Tamper
 id: 4eec988f-7bf0-49f1-8675-1e6a510b3a2a
 status: experimental
-description: Detect use of the PendingFileRenameOperations to rename a file in a suspicious folder.
+description: Detect changes to the "PendingFileRenameOperations" registry key from uncommon or suspicious images lcoations to stage currently used files for rename after reboot.
 references:
-    - https://app.any.run/tasks/64b0ba45-e7ce-423b-9a1d-5b4ea59521e6/
+    - https://any.run/report/3ecd4763ffc944fdc67a9027e459cd4f448b1a8d1b36147977afaf86bbf2a261/64b0ba45-e7ce-423b-9a1d-5b4ea59521e6
     - https://devblogs.microsoft.com/scripting/determine-pending-reboot-statuspowershell-style-part-1/
+    - https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-2000-server/cc960241(v=technet.10)?redirectedfrom=MSDN
+    - https://www.trendmicro.com/en_us/research/21/j/purplefox-adds-new-backdoor-that-uses-websockets.html
+    - https://www.trendmicro.com/en_us/research/19/i/purple-fox-fileless-malware-with-rookit-component-delivered-by-rig-exploit-kit-now-abuses-powershell.html
 author: frack113
 date: 2023/01/27
 tags:
     - attack.defense_evasion
-    - attack.t1036.003 
+    - attack.t1036.003
 logsource:
     category: registry_set
     product: windows
 detection:
-    selection:
+    selection_main:
         EventType: 'SetValue'
-        TargetObject|endswith: '\SYSTEM\CurrentControlSet\Control\SESSION MANAGER\PendingFileRenameOperations'
-        Details|contains: 
+        TargetObject|contains: '\CurrentControlSet\Control\Session Manager\PendingFileRenameOperations'
+    selection_susp_paths:
+        Image|contains:
             - '\AppData\Local\Temp\'
             - '\Users\Public\'
-    condition: selection
+    selection_susp_images:
+        - Image|endswith:
+            - '\reg.exe'
+            - '\regedit.exe'
+    condition: selection_main and 1 of selection_susp_*
 falsepositives:
-    - Unknown
+    - Installers and updaters may set currently in use files for rename after a reboot.
 level: medium

From 7ea3db18f7a6db3cda4598cd9972b2983e04f343 Mon Sep 17 00:00:00 2001
From: frack113 <62423083+frack113@users.noreply.github.com>
Date: Fri, 27 Jan 2023 15:09:43 +0100
Subject: [PATCH 4/4] Fix test errors

---
 .github/workflows/known-FPs.csv                                 | 2 ++
 .../registry_set_susp_pendingfilerenameoperations.yml           | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/known-FPs.csv b/.github/workflows/known-FPs.csv
index 37227c5c3..5a309c5e7 100644
--- a/.github/workflows/known-FPs.csv
+++ b/.github/workflows/known-FPs.csv
@@ -52,3 +52,5 @@ b69888d4-380c-45ce-9cf9-d9ce46e67821;Executable in ADS;7z\.exe
 65236ec7-ace0-4f0c-82fd-737b04fd4dcb;EVTX Created In Uncommon Location;powershell\.exe
 a62b37e0-45d3-48d9-a517-90c1a1b0186b;Eventlog Cleared;Computer: DESKTOP-A8CALR3
 a62b37e0-45d3-48d9-a517-90c1a1b0186b;Eventlog Cleared;Computer: WIN-06FB45IHQ35
+4eec988f-7bf0-49f1-8675-1e6a510b3a2a;Potential PendingFileRenameOperations Tamper;target\.exe
+4eec988f-7bf0-49f1-8675-1e6a510b3a2a;Potential PendingFileRenameOperations Tamper;target\.tmp
diff --git a/rules/windows/registry/registry_set/registry_set_susp_pendingfilerenameoperations.yml b/rules/windows/registry/registry_set/registry_set_susp_pendingfilerenameoperations.yml
index fd4396ec6..aba450b50 100644
--- a/rules/windows/registry/registry_set/registry_set_susp_pendingfilerenameoperations.yml
+++ b/rules/windows/registry/registry_set/registry_set_susp_pendingfilerenameoperations.yml
@@ -25,7 +25,7 @@ detection:
             - '\AppData\Local\Temp\'
             - '\Users\Public\'
     selection_susp_images:
-        - Image|endswith:
+        Image|endswith:
             - '\reg.exe'
             - '\regedit.exe'
     condition: selection_main and 1 of selection_susp_*