New content

detections/endpoint/powershell_com_hijacking_inprocserver32_modification.yml

@@ -0,0 +1,64 @@
+name: Powershell COM Hijacking InprocServer32 Modification
+id: ea61e291-af05-4716-932a-67faddb6ae6f
+version: 1
+date: '2022-09-26'
+author: Michael Haag, Splunk
+type: TTP
+datamodel:
+- Endpoint
+description: The following analytic utilizes PowerShell ScriptBlock Logging to identify a script that is attempting to modify or add a component object model to inprocserver32 path within the registry.
+search: '`powershell` EventCode=4104 ScriptBlockText = "*Software\\Classes\\CLSID\\*\\InProcServer32*" | stats count min(_time)
+  as firstTime max(_time) as lastTime by EventCode ScriptBlockText Computer UserID | `security_content_ctime(firstTime)`
+  | `security_content_ctime(lastTime)` | `powershell_com_hijacking_inprocserver32_modification_filter`'
+how_to_implement: The following analytic requires PowerShell operational logs
+  to be imported. Modify the PowerShell macro as needed to match the sourcetype or
+  add index. This analytic is specific to 4104, or PowerShell Script Block Logging.
+known_false_positives: False positives will be present if any scripts are adding to inprocserver32. Filter as needed.
+references:
+  - https://attack.mitre.org/techniques/T1546/015/
+  - https://www.splunk.com/en_us/blog/security/hunting-for-malicious-powershell-using-script-block-logging.html
+  - https://blog.cluster25.duskrise.com/2022/09/23/in-the-footsteps-of-the-fancy-bear-powerpoint-graphite/
+  - https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1546.015/T1546.015.md
+tags:
+  analytic_story:
+  - Malicious PowerShell
+  asset_type: Endpoint
+  cis20:
+  - CIS 3
+  - CIS 5
+  - CIS 16
+  confidence: 80
+  context:
+  - Source:Endpoint
+  - Stage:Defense Evasion
+  dataset:
+  - https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1546.015/atomic_red_team/windows-powershell.log
+  impact: 80
+  kill_chain_phases:
+  - Exploitation
+  - Installation
+  message: A PowerShell script has been identified with InProcServer32 within the script code on $Computer$.
+  mitre_attack_id:
+  - T1546.015
+  - T1059
+  - T1059.001
+  nist:
+  - DE.CM
+  observable:
+  - name: Computer
+    type: Hostname
+    role:
+    - Victim
+  product:
+  - Splunk Enterprise
+  - Splunk Enterprise Security
+  - Splunk Cloud
+  required_fields:
+  - _time
+  - ScriptBlockText
+  - Opcode
+  - Computer
+  - UserID
+  - EventCode
+  risk_score: 64
+  security_domain: endpoint

detections/endpoint/windows_com_hijacking_inprocserver32_modification.yml

@@ -0,0 +1,72 @@
+name: Windows COM Hijacking InprocServer32 Modification
+id: b7bd83c0-92b5-4fc7-b286-23eccfa2c561
+version: 1
+date: '2022-09-26'
+author: Michael Haag, Splunk
+type: TTP
+datamodel:
+- Endpoint
+description: The following analytic identifies the use of reg.exe performing an add to the InProcServer32, which is related to COM hijacking.
+  Adversaries can use the COM system to insert malicious code that can be executed in place of legitimate software through hijacking the COM references and relationships as a means for persistence. Hijacking a COM object requires a change in the Registry to replace a reference to a legitimate system component which may cause that component to not work when executed. When that system component is executed through normal system operation the adversary's code will be executed instead.
+search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
+  as lastTime from datamodel=Endpoint.Processes where `process_reg`
+  Processes.process=*inprocserver32* by Processes.dest Processes.user Processes.parent_process_name Processes.process_name
+  Processes.process Processes.process_id Processes.parent_process_id
+  | `drop_dm_object_name(Processes)` 
+  | `security_content_ctime(firstTime)`
+  | `security_content_ctime(lastTime)` 
+  | `windows_com_hijacking_inprocserver32_modification_filter`'
+how_to_implement: To successfully implement this search you need to be ingesting information on process that include the name of the process responsible for the changes from your endpoints into the `Endpoint` datamodel in the `Processes` node. In addition, confirm the latest CIM App 4.20 or higher is installed and the latest TA for the endpoint product.
+known_false_positives: False positives may be present and some filtering may be required.
+references:
+  - https://attack.mitre.org/techniques/T1546/015/
+  - https://blog.cluster25.duskrise.com/2022/09/23/in-the-footsteps-of-the-fancy-bear-powerpoint-graphite/
+  - https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1546.015/T1546.015.md
+tags:
+  analytic_story:
+  - Living Off The Land
+  asset_type: Endpoint
+  cis20:
+  - CIS 3
+  - CIS 5
+  - CIS 16
+  confidence: 80
+  context:
+  - Source:Endpoint
+  - Stage:Execution
+  dataset:
+  - https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1546.015/atomic_red_team/windows-sysmon.log
+  impact: 80
+  kill_chain_phases:
+  - Exploitation
+  message: An instance of $parent_process_name$ spawning $process_name$ was identified on endpoint $dest$ by user $user$ attempting to modify InProcServer32 within the registry.
+  mitre_attack_id:
+  - T1546.015
+  - T1546
+  nist:
+  - DE.CM
+  observable:
+  - name: user
+    type: User
+    role:
+    - Victim
+  - name: dest
+    type: Hostname
+    role:
+    - Victim
+  - name: parent_process_name
+    type: Process
+    role:
+    - Parent Process
+  - name: process_name
+    type: Process
+    role:
+    - Child Process
+  product:
+  - Splunk Enterprise
+  - Splunk Enterprise Security
+  - Splunk Cloud
+  required_fields:
+  - UPDATE
+  risk_score: 64
+  security_domain: endpoint

detections/endpoint/windows_system_script_proxy_execution_syncappvpublishingserver.yml

@@ -0,0 +1,83 @@
+name: Windows System Script Proxy Execution Syncappvpublishingserver
+id: 8dd73f89-682d-444c-8b41-8e679966ad3c
+version: 1
+date: '2022-09-26'
+author: Michael Haag, Splunk
+type: TTP
+datamodel:
+- Endpoint
+description: The following analytic identifies the abuse of Syncappvpublishingserver.vbs, which is a native script on Windows that may be utilized to download remote files or perform privilege escalation.
+search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
+  as lastTime from datamodel=Endpoint.Processes where Processes.process_name IN ("wscript.exe","cscript.exe")
+  Processes.process="*syncappvpublishingserver.vbs*" by Processes.dest Processes.user Processes.parent_process_name Processes.process_name
+  Processes.process Processes.process_id Processes.parent_process_id
+  | `drop_dm_object_name(Processes)` 
+  | `security_content_ctime(firstTime)`
+  | `security_content_ctime(lastTime)`
+  | `windows_system_script_proxy_execution_syncappvpublishingserver_filter`'
+how_to_implement: To successfully implement this search you need to be ingesting information on process that include the name of the process responsible for the changes from your endpoints into the `Endpoint` datamodel in the `Processes` node. In addition, confirm the latest CIM App 4.20 or higher is installed and the latest TA for the endpoint product.
+known_false_positives: False positives may be present if the vbscript syncappvpublishingserver is used for legitimate purposes. Filter as needed. Adding a n; to the command-line arguments may help reduce any noise.
+references:
+  - https://lolbas-project.github.io/lolbas/Scripts/Syncappvpublishingserver/
+  - https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1216/T1216.md#atomic-test-1---syncappvpublishingserver-signed-script-powershell-command-execution
+tags:
+  analytic_story:
+  - Living Off The Land
+  asset_type: Endpoint
+  cis20:
+  - CIS 3
+  - CIS 5
+  - CIS 16
+  confidence: 50
+  context:
+  - Source:Endpoint
+  - Stage:Execution
+  dataset:
+  - https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1216/atomic_red_team/windows-sysmon.log
+  impact: 60
+  kill_chain_phases:
+  - Exploitation
+  message: An instance of $parent_process_name$ spawning $process_name$ was identified on endpoint $dest$ by user $user$ attempting to download files or evade critical controls.
+  mitre_attack_id:
+  - T1216
+  - T1218
+  nist:
+  - DE.CM
+  observable:
+  - name: user
+    type: User
+    role:
+    - Victim
+  - name: dest
+    type: Hostname
+    role:
+    - Victim
+  - name: parent_process_name
+    type: Process
+    role:
+    - Parent Process
+  - name: process_name
+    type: Process
+    role:
+    - Child Process
+  product:
+  - Splunk Enterprise
+  - Splunk Enterprise Security
+  - Splunk Cloud
+  required_fields:
+  - _time
+  - Processes.dest
+  - Processes.user
+  - Processes.parent_process_name
+  - Processes.parent_process
+  - Processes.original_file_name
+  - Processes.process_name
+  - Processes.process
+  - Processes.process_id
+  - Processes.parent_process_path
+  - Processes.process_path
+  - Processes.parent_process_id
+  risk_score: 30
+  security_domain: endpoint
+  supported_tas:
+  - Splunk_TA_microsoft_sysmon

tests/endpoint/powershell_com_hijacking_inprocserver32_modification.test.yml

@@ -0,0 +1,14 @@
+name: Powershell COM Hijacking InprocServer32 Modification Unit
+  Test
+tests:
+- name: Powershell COM Hijacking InprocServer32 Modification
+  file: endpoint/powershell_com_hijacking_inprocserver32_modification.yml
+  pass_condition: '| stats count | where count > 0'
+  earliest_time: -24h
+  latest_time: now
+  attack_data:
+  - file_name: windows-powershell.log
+    data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1546.015/atomic_red_team/windows-powershell.log
+    source: XmlWinEventLog:Microsoft-Windows-PowerShell/Operational
+    sourcetype: xmlwineventlog
+    update_timestamp: true

tests/endpoint/windows_com_hijacking_inprocserver32_modification.test.yml

@@ -0,0 +1,13 @@
+name: Windows COM Hijacking InprocServer32 Modification Unit Test
+tests:
+- name: Windows COM Hijacking InprocServer32 Modification
+  file: endpoint/windows_com_hijacking_inprocserver32_modification.yml
+  pass_condition: '| stats count | where count > 0'
+  earliest_time: -24h
+  latest_time: now
+  attack_data:
+  - file_name: windows-sysmon.log
+    data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1546.015/atomic_red_team/windows-sysmon.log
+    source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
+    sourcetype: xmlwineventlog
+    update_timestamp: true

tests/endpoint/windows_system_script_proxy_execution_syncappvpublishingserver.test.yml

@@ -0,0 +1,13 @@
+name: Windows System Script Proxy Execution Syncappvpublishingserver Unit Test
+tests:
+- name: Windows System Script Proxy Execution Syncappvpublishingserver
+  file: endpoint/windows_system_script_proxy_execution_syncappvpublishingserver.yml
+  pass_condition: '| stats count | where count > 0'
+  earliest_time: -24h
+  latest_time: now
+  attack_data:
+  - file_name: windows-sysmon.log
+    data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1216/atomic_red_team/windows-sysmon.log
+    source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
+    sourcetype: xmlwineventlog
+    update_timestamp: true