From 4dc022f85a7d871d3b2ea7805cdbf6c204e215f1 Mon Sep 17 00:00:00 2001
From: Swachchhanda Shrawan Poudel <swachchhandashrawan@gmail.com>
Date: Tue, 16 Jan 2024 21:04:43 +0545
Subject: [PATCH] Added and updatd pikabot related rules

---
 ..._win_malware_pikabot_rundll32_activity.yml |  2 +
 ...reation_win_malware_pikabot_discovery.yaml | 37 +++++++++++++++
 ...in_malware_pikabot_rundll32_execution.yaml | 45 +++++++++++++++++++
 ...win_malware_pikabot_rundll32_hollowing.yml |  2 +
 4 files changed, 86 insertions(+)
 create mode 100644 rules-emerging-threats/2023/Malware/Pikabot/proc_creation_win_malware_pikabot_discovery.yaml
 create mode 100644 rules-emerging-threats/2023/Malware/Pikabot/proc_creation_win_malware_pikabot_rundll32_execution.yaml

diff --git a/rules-emerging-threats/2023/Malware/Pikabot/net_connection_win_malware_pikabot_rundll32_activity.yml b/rules-emerging-threats/2023/Malware/Pikabot/net_connection_win_malware_pikabot_rundll32_activity.yml
index 7b0e2de367a..7328d47964d 100644
--- a/rules-emerging-threats/2023/Malware/Pikabot/net_connection_win_malware_pikabot_rundll32_activity.yml
+++ b/rules-emerging-threats/2023/Malware/Pikabot/net_connection_win_malware_pikabot_rundll32_activity.yml
@@ -6,6 +6,7 @@ description: |
     The malware Pikabot has been seen to use this technique to initiate C2-communication through hard-coded Windows binaries.
 references:
     - https://www.virustotal.com/gui/file/d72af640b71b8e3eca3eba660dd7c7f029ff8852bcacaa379e7b6c57cf4d9b44
+    - https://www.virustotal.com/gui/file/6bb4cdbaef03b732a93559a58173e7f16b29bfb159a1065fae9185000ff23b4b
 author: Andreas Braathen (mnemonic.io)
 date: 2023/10/27
 tags:
@@ -21,6 +22,7 @@ detection:
         ParentImage|endswith: '\rundll32.exe'
         Image|endswith:
             # Note: Only add processes seen used by Pikabot to avoid collision with other strains of malware
+            - '\searchfilterhost.exe'
             - '\searchprotocolhost.exe'
             - '\sndvol.exe'
             - '\wermgr.exe'
diff --git a/rules-emerging-threats/2023/Malware/Pikabot/proc_creation_win_malware_pikabot_discovery.yaml b/rules-emerging-threats/2023/Malware/Pikabot/proc_creation_win_malware_pikabot_discovery.yaml
new file mode 100644
index 00000000000..1c6f4e1b6ab
--- /dev/null
+++ b/rules-emerging-threats/2023/Malware/Pikabot/proc_creation_win_malware_pikabot_discovery.yaml
@@ -0,0 +1,37 @@
+title: Potential Pikabot Discovery Activity
+id: 84d70ab3-ba9f-420f-9b9c-c148760ac61f
+status: experimental
+description: Detects the system discovery activity carried out by Pikabot, after injecting it into legitimitate process such as searchfilterhost.exe. 
+references:
+    - https://tria.ge/231023-lpw85she57/behavioral2
+    - https://tria.ge/231211-yqc8wahea6/behavioral2
+    - https://tria.ge/231206-w5gthabf23/behavioral2
+author: Swachchhanda Shrawan Poudel
+date: 2024/01/16
+tags:
+    - attack.discovery
+    - attack.t1016
+    - attack.t1049
+    - attack.t1087
+    - detection.emerging_threats
+detection:
+    selection_1:
+        Image|endswith:
+            - '\SearchProtocolHost.exe'
+            - '\SearchFilterHost.exe'
+        CommandLine:
+            - 'ipconfig.exe /all'
+            - 'netstat.exe -aon'
+            - 'whoami.exe /all'
+      selection_2:
+        Image|endswith:
+            - '\ipconfig.exe'
+            - '\netstat.exe'
+            - '\whoami.exe'
+        ParentImage|endswith:
+            - '\SearchProtocolHost.exe'
+            - '\SearchFilterHost.exe'
+    condition: 1 of selection_*
+falsepositives:
+    - Unlikely
+level: Critical
\ No newline at end of file
diff --git a/rules-emerging-threats/2023/Malware/Pikabot/proc_creation_win_malware_pikabot_rundll32_execution.yaml b/rules-emerging-threats/2023/Malware/Pikabot/proc_creation_win_malware_pikabot_rundll32_execution.yaml
new file mode 100644
index 00000000000..769c3d0e513
--- /dev/null
+++ b/rules-emerging-threats/2023/Malware/Pikabot/proc_creation_win_malware_pikabot_rundll32_execution.yaml
@@ -0,0 +1,45 @@
+title: Suspicious Rundll32 Pikabot's Fake DLL Extension Execution
+id: 1bf0ba65-9a39-42a2-9271-31d31bf2f0bf
+status: experimental
+description: Detect specific process tree behavior linked to "rundll32" executions, wherein the associated DLL lacks the ".dll" extension, often signaling potential Pikabot activity.
+references:
+    - https://github.com/pr0xylife/Pikabot
+    - https://tria.ge/231004-tp8k6sch9t/behavioral2
+    - https://tria.ge/231206-w5gthabf23/behavioral2
+    - https://www.virustotal.com/gui/file/56db0c4842a63234ab7fe2dda6eeb63aa7bb68f9a456985b519122f74dea37e2/behavior
+    - https://tria.ge/231212-r1bpgaefar/behavioral2
+author: Swachchhanda Shrawan Poudel
+date: 2024/01/16
+tags:
+    - detection.emerging_threats
+    - attack.defense_evasion
+    - attack.execution
+logsource:
+    product: windows
+    category: process_creation
+detection:
+    selection_parent_image:
+        ParentImage|endswith:
+            - '\cmd.exe'
+            - '\cscript.exe'
+            - '\curl.exe'
+            - '\mshta.exe'
+            - '\powershell.exe'
+            - '\pwsh.exe'
+            - '\wscript.exe'
+            - '\msiexec.exe'
+            - '\rundll32.exe'
+    selection_image_and_cmd:
+        Image|endswith: '\rundll32.exe'
+        CommandLine|contains:
+            - '\Windows\Installer\'
+            - ':\ProgramData\'
+            - ':\Users\Public\'
+            - '\AppData\Local\Temp\'
+            - '\AppData\Roaming\'
+    filter_dll_extension:
+        CommandLine|contains: '.dll'
+    condition: all of selection_* and not filter_dll_extension
+falsepositives:
+    - Unlikely
+level: high
\ No newline at end of file
diff --git a/rules-emerging-threats/2023/Malware/Pikabot/proc_creation_win_malware_pikabot_rundll32_hollowing.yml b/rules-emerging-threats/2023/Malware/Pikabot/proc_creation_win_malware_pikabot_rundll32_hollowing.yml
index bf46872d9b2..a519d78dbf6 100644
--- a/rules-emerging-threats/2023/Malware/Pikabot/proc_creation_win_malware_pikabot_rundll32_hollowing.yml
+++ b/rules-emerging-threats/2023/Malware/Pikabot/proc_creation_win_malware_pikabot_rundll32_hollowing.yml
@@ -6,6 +6,7 @@ description: |
     The malware Pikabot has been seen to use this technique for process hollowing through hard-coded Windows binaries
 references:
     - https://www.virustotal.com/gui/file/b6e8910fb9b3bb1fcddefd35ff0ed8624930d30d6977e11808c8330415685a62
+    - https://www.virustotal.com/gui/file/6bb4cdbaef03b732a93559a58173e7f16b29bfb159a1065fae9185000ff23b4b
 author: Andreas Braathen (mnemonic.io)
 date: 2023/10/27
 tags:
@@ -20,6 +21,7 @@ detection:
         ParentImage|endswith: '\rundll32.exe'
         Image|endswith:
             # Note: Only add processes seen used by Pikabot to avoid collision with other strains of malware
+            - '\searchfilterhost.exe'
             - '\searchprotocolhost.exe'
             - '\sndvol.exe'
             - '\wermgr.exe'