iceid_ttps

detections/endpoint/disable_defender_antivirus_registry.yml

@@ -18,7 +18,7 @@ search: '| tstats `security_content_summariesonly` count min(_time) as firstTime
   Registry.registry_value_data | `drop_dm_object_name(Registry)` | `security_content_ctime(lastTime)`
   | `security_content_ctime(firstTime)` | `disable_defender_antivirus_registry_filter`'
 how_to_implement: To successfully implement this search, you need to be ingesting
-  logs with the process name, parent process, and command-line executions from your
+  logs with the registry value name, registry path, and registry value data from your
   endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the
   Sysmon TA.
 known_false_positives: admin or user may choose to disable windows defender product
@@ -53,7 +53,7 @@ tags:
   context:
   - Source:Endpoint
   - Stage:Defense Evasion
-  message: modified/added/deleted registry entry $Registry.registry_path$ in $dest$
+  message: modified/added/deleted registry entry $registry_path$ in $dest$
   observable:
   - name: dest
     type: Hostname

detections/endpoint/disable_defender_blockatfirstseen_feature.yml

@@ -17,7 +17,7 @@ search: '| tstats `security_content_summariesonly` count min(_time) as firstTime
   Registry.registry_value_data | `drop_dm_object_name(Registry)` | `security_content_ctime(lastTime)`
   | `security_content_ctime(firstTime)` | `disable_defender_blockatfirstseen_feature_filter`'
 how_to_implement: To successfully implement this search, you need to be ingesting
-  logs with the process name, parent process, and command-line executions from your
+  logs with the registry value name, registry path, and registry value data from your
   endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the
   Sysmon TA.
 known_false_positives: admin or user may choose to disable windows defender product
@@ -52,7 +52,7 @@ tags:
   context:
   - Source:Endpoint
   - Stage:Defense Evasion
-  message: modified/added/deleted registry entry $Registry.registry_path$ in $dest$
+  message: modified/added/deleted registry entry $registry_path$ in $dest$
   observable:
   - name: dest
     type: Hostname

detections/endpoint/disable_defender_enhanced_notification.yml

@@ -17,9 +17,9 @@ search: '| tstats `security_content_summariesonly` count min(_time) as firstTime
   Registry.registry_value_name Registry.registry_value_data | `drop_dm_object_name(Registry)`
   | `security_content_ctime(lastTime)` | `security_content_ctime(firstTime)` | `disable_defender_enhanced_notification_filter`'
 how_to_implement: To successfully implement this search, you need to be ingesting
-  logs with the process name, parent process, and command-line executions from your
+  logs with the registry value name, registry path, and registry value data executions from your
   endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the
-  Sysmon TA. Tune and filter known instances where renamed rundll32.exe may be used.
+  Sysmon TA. 
 known_false_positives: user may choose to disable windows defender AV
 references:
 - https://thedfirreport.com/2021/10/18/icedid-to-xinglocker-ransomware-in-24-hours/
@@ -52,7 +52,7 @@ tags:
   context:
   - Source:Endpoint
   - Stage:Defense Evasion
-  message: modified/added/deleted registry entry $Registry.registry_path$ in $dest$
+  message: modified/added/deleted registry entry $registry_path$ in $dest$
   observable:
   - name: dest
     type: Hostname

detections/endpoint/disable_defender_mpengine_registry.yml

@@ -18,7 +18,7 @@ search: '| tstats `security_content_summariesonly` count min(_time) as firstTime
   Registry.registry_value_data | `drop_dm_object_name(Registry)` | `security_content_ctime(lastTime)`
   | `security_content_ctime(firstTime)` | `disable_defender_mpengine_registry_filter`'
 how_to_implement: To successfully implement this search, you need to be ingesting
-  logs with the process name, parent process, and command-line executions from your
+  logs with the registry value name, registry path, and registry value data from your
   endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the
   Sysmon TA.
 known_false_positives: admin or user may choose to disable windows defender product
@@ -53,7 +53,7 @@ tags:
   context:
   - Source:Endpoint
   - Stage:Defense Evasion
-  message: modified/added/deleted registry entry $Registry.registry_path$ in $dest$
+  message: modified/added/deleted registry entry $registry_path$ in $dest$
   observable:
   - name: dest
     type: Hostname

detections/endpoint/disable_defender_spynet_reporting.yml

@@ -16,7 +16,7 @@ search: '| tstats `security_content_summariesonly` count min(_time) as firstTime
   Registry.registry_value_data | `drop_dm_object_name(Registry)` | `security_content_ctime(lastTime)`
   | `security_content_ctime(firstTime)` | `disable_defender_spynet_reporting_filter`'
 how_to_implement: To successfully implement this search, you need to be ingesting
-  logs with the process name, parent process, and command-line executions from your
+  logs with the registry value name, registry path, and registry value data from your
   endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the
   Sysmon TA.
 known_false_positives: admin or user may choose to disable windows defender product
@@ -51,7 +51,7 @@ tags:
   context:
   - Source:Endpoint
   - Stage:Defense Evasion
-  message: modified/added/deleted registry entry $Registry.registry_path$ in $dest$
+  message: modified/added/deleted registry entry $registry_path$ in $dest$
   observable:
   - name: dest
     type: Hostname

detections/endpoint/disable_defender_submit_samples_consent_feature.yml

@@ -16,7 +16,7 @@ search: '| tstats `security_content_summariesonly` count min(_time) as firstTime
   Registry.registry_value_data | `drop_dm_object_name(Registry)` | `security_content_ctime(lastTime)`
   | `security_content_ctime(firstTime)` | `disable_defender_submit_samples_consent_feature_filter`'
 how_to_implement: To successfully implement this search, you need to be ingesting
-  logs with the process name, parent process, and command-line executions from your
+  logs with the registry value name, registry path, and registry value data from your
   endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the
   Sysmon TA.
 known_false_positives: admin or user may choose to disable windows defender product

detections/endpoint/disabling_defender_services.yml

@@ -0,0 +1,69 @@
+name: Disabling Defender Services
+id: 911eacdc-317f-11ec-ad30-acde48001122
+version: 1
+date: '2021-10-20'
+author: Teoderick Contreras, Splunk
+type: TTP
+datamodel:
+- Endpoint
+description: This particular behavior is typically executed when an adversaries or
+  malware gains access to an endpoint and beings to perform execution and to evade
+  detections. Usually, a batch (.bat) will be executed and multiple registry and scheduled
+  task modifications will occur. During triage, review parallel processes and identify
+  any further file modifications. Endpoint should be isolated.
+search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
+  as lastTime from datamodel=Endpoint.Registry where Registry.registry_path = "*\\System\\CurrentControlSet\\Services\\*" 
+  AND (Registry.registry_path IN("*WdBoot*", "*WdFilter*", "*WdNisDrv*", "*WdNisSvc*", "*WinDefend*", "*SecurityHealthService*"))  AND 
+  Registry.registry_value_name = Start Registry.registry_value_data = 0x00000004
+  by Registry.dest Registry.user Registry.registry_path Registry.registry_value_name Registry.registry_value_data 
+  | `drop_dm_object_name(Registry)` 
+  | `security_content_ctime(lastTime)`
+  | `security_content_ctime(firstTime)`
+  | `disabling_defender_services_filter`'
+how_to_implement: To successfully implement this search, you need to be ingesting
+  logs with the process name, parent process, and command-line executions from your
+  endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the
+  Sysmon TA.
+known_false_positives: admin or user may choose to disable windows defender product
+references:
+- https://thedfirreport.com/2021/10/18/icedid-to-xinglocker-ransomware-in-24-hours/
+tags:
+  analytic_story:
+  - IceID
+  dataset:
+  - https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/icedid/disable_av/sysmon2.log
+  kill_chain_phases:
+  - Exploitation
+  mitre_attack_id:
+  - T1562.001
+  - T1562
+  product:
+  - Splunk Enterprise
+  - Splunk Enterprise Security
+  - Splunk Cloud
+  required_fields:
+  - _time
+  - Registry.dest
+  - Registry.user
+  - Registry.registry_value_name
+  - Registry.registry_key_name
+  - Registry.registry_path
+  - Registry.registry_value_data
+  security_domain: endpoint
+  impact: 70
+  confidence: 70
+  risk_score: 49
+  context:
+  - Source:Endpoint
+  - Stage:Defense Evasion
+  message: modified/added/deleted registry entry $registry_path$ in $dest$
+  observable:
+  - name: dest
+    type: Hostname
+    role:
+    - Victim
+  - name: user
+    type: user
+    role:
+    - Victim
+  

detections/endpoint/wmic_noninteractive_app_uninstallation.yml

@@ -0,0 +1,77 @@
+name: Wmic NonInteractive App Uninstallation
+id: bff0e7a0-317f-11ec-ab4e-acde48001122
+version: 1
+date: '2021-10-20'
+author: Teoderick Contreras, Splunk
+type: Hunting
+datamodel:
+- Endpoint
+description: This analytic is to detect a suspicious wmic commandlined that uninstall application non interactively. 
+  This technique was seen in IceID to uninstall av products to the compromised host to bypassed and evade detections. 
+  This Hunting query maybe a good indicator that some process tries to uninstall application using wmic which is not a common behavior. 
+  This approach may seen in some script or third part appication to uninstall their application but it is a good thing to check what it uninstall and why.
+search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
+  as lastTime from datamodel=Endpoint.Processes where Processes.process_name=wmic.exe
+  Processes.process="* product *" Processes.process="*where name*" Processes.process="*call uninstall*" Processes.process="*/nointeractive*" 
+  by Processes.dest Processes.user Processes.parent_process_name Processes.process_name Processes.process Processes.original_file_name Processes.process_id
+  Processes.parent_process_id 
+  | `drop_dm_object_name(Processes)` 
+  | `security_content_ctime(firstTime)`
+  | `security_content_ctime(lastTime)` 
+  | `wmic_noninteractive_app_uninstallation_filter`'
+how_to_implement: To successfully implement this search, you need to be ingesting
+  logs with the process name, parent process, and command-line executions from your
+  endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the
+  Sysmon TA. 
+known_false_positives: third party application may use this approach to uninstall there application
+references:
+-  https://thedfirreport.com/2021/10/18/icedid-to-xinglocker-ransomware-in-24-hours/
+tags:
+  analytic_story:
+  - IceID
+  dataset:
+  - https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/icedid/disable_av/sysmon2.log
+  kill_chain_phases:
+  - Exploitation
+  mitre_attack_id:
+  - T1562.001
+  - T1562
+  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
+  security_domain: endpoint
+  impact: 50
+  confidence: 50
+  # (impact * confidence)/100
+  risk_score: 25
+  context:
+  - Source:Endpoint
+  - Stage:Defense Evasion
+  message: wmic $process$ with commandline $process$ in $dest$
+  observable:
+  - name: dest
+    type: Endpoint
+    role:
+    - Victim
+  - name: user
+    type: User
+    role:
+    - Victim
+  - name: process_name
+    type: Process
+    role:
+    - Target

tests/endpoint/disabling_defender_services.test.yml

@@ -0,0 +1,12 @@
+name: Disabling Defender Services Unit Test
+tests:
+- name: Disabling Defender Services
+  file: endpoint/disabling_defender_services.yml
+  pass_condition: '| stats count | where count > 0'
+  earliest_time: '-24h'
+  latest_time: 'now'
+  attack_data:
+  - file_name: sysmon2.log
+    data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/icedid/disable_av/sysmon2.log
+    source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
+    sourcetype: xmlwineventlog

tests/endpoint/wmic_noninteractive_app_uninstallation.test.yml

@@ -0,0 +1,12 @@
+name: Wmic NonInteractive App Uninstallation Unit Test
+tests:
+- name: Wmic NonInteractive App Uninstallation
+  file: endpoint/wmic_noninteractive_app_uninstallation.yml
+  pass_condition: '| stats count | where count > 0'
+  earliest_time: '-24h'
+  latest_time: 'now'
+  attack_data:
+  - file_name: sysmon2.log
+    data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/icedid/disable_av/sysmon2.log
+    source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
+    sourcetype: xmlwineventlog