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detections/endpoint/windows_binary_proxy_execution_mavinject_dll_injection.yml

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+name: Windows Binary Proxy Execution Mavinject DLL Injection
+id: ccf4b61b-1b26-4f2e-a089-f2009c569c57
+version: 1
+date: '2022-07-07'
+author: Michael Haag, Splunk
+type: TTP
+datamodel:
+- Endpoint
+description: Adversaries may abuse mavinject.exe to inject malicious DLLs into running processes (i.e. Dynamic-link Library Injection), allowing for arbitrary code execution (ex. C:\Windows\system32\mavinject.exe PID /INJECTRUNNING PATH_DLL).
+  In addition to Dynamic-link Library Injection, Mavinject.exe can also be abused to perform import descriptor injection via its /HMODULE command-line parameter (ex. mavinject.exe PID /HMODULE=BASE_ADDRESS PATH_DLL ORDINAL_NUMBER). This command would inject an import table entry consisting of the specified DLL into the module at the given base address.
+  During triage, review file modifcations and parallel processes.
+search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
+  as lastTime from datamodel=Endpoint.Processes where Processes.process_name=mavinject.exe Processes.process IN ("*injectrunning*", "*hmodule=0x*")
+   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_binary_proxy_execution_mavinject_dll_injection_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, filter on DLL name or parent process. 
+references:
+  - https://attack.mitre.org/techniques/T1218/013/
+  - https://posts.specterops.io/mavinject-exe-functionality-deconstructed-c29ab2cf5c0e
+  - https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1218/T1218.md#atomic-test-1---mavinject---inject-dll-into-running-process
+tags:
+  analytic_story:
+  - Living Off The Land
+  asset_type: Endpoint
+  cis20:
+  - CIS 3
+  - CIS 5
+  - CIS 16
+  confidence: 70
+  context:
+  - Source:Endpoint
+  - Stage:Defense Evasion
+  dataset:
+  - https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1218.013/atomic_red_team/windows-sysmon.log
+  impact: 70
+  kill_chain_phases:
+  - Exploitation
+  message: An instance of $parent_process_name$ spawning $process_name$ was identified on endpoint $dest$ by user $user$ attempting load a DLL.
+  mitre_attack_id:
+  - T1218.013
+  - T1218
+  nist:
+  - DE.CM
+  observable:
+  - name: user
+    type: User
+    role:
+    - Victim
+  - name: dest
+    type: Hostname
+    role:
+    - Victim
+  - name: parent_process_name
+    type: Process Name
+    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 #parent process name
+  - Processes.parent_process #parent cmdline
+  - Processes.original_file_name
+  - Processes.process_name #process name
+  - Processes.process #process cmdline
+  - Processes.process_id
+  - Processes.parent_process_path
+  - Processes.process_path
+  - Processes.parent_process_id
+  risk_score: 49
+  security_domain: endpoint

tests/endpoint/windows_binary_proxy_execution_mavinject_dll_injection.test.yml

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+name: Windows Binary Proxy Execution Mavinject DLL Injection Unit Test
+tests:
+- name: Windows Binary Proxy Execution Mavinject DLL Injection
+  file: endpoint/windows_binary_proxy_execution_mavinject_dll_injection.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/T1218.013/atomic_red_team/windows-sysmon.log
+    source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
+    sourcetype: xmlwineventlog
+    update_timestamp: true