Branch was auto-updated.

detections/endpoint/cmd_carry_out_string_command_parameter.yml

@@ -37,6 +37,7 @@ tags:
   - Hermetic Wiper
   - Living Off The Land
   - Azorult
+  - DarkCrystal RAT
   automated_detection_testing: passed
   confidence: 50
   context:

detections/endpoint/windows_command_shell_dcrat_forkbomb_payload.yml

@@ -0,0 +1,77 @@
+name: Windows Command Shell DCRat ForkBomb Payload
+id: 2bb1a362-7aa8-444a-92ed-1987e8da83e1
+version: 1
+date: '2022-07-28'
+author: Teoderick Contreras, Splunk
+type: TTP
+datamodel:
+- Endpoint
+description: The following analytic identifies DCRat "forkbomb" payload feature. 
+  This technique was seen in dark crystal RAT backdoor capabilities where it will execute several cmd child process 
+  executing "notepad.exe & pause". This analytic detects the multiple cmd.exe and child process notepad.exe  execution using batch script 
+  in the targeted host within 30s timeframe. this TTP can be a good pivot to check DCRat infection.
+search: '| tstats `security_content_summariesonly` values(Processes.process) as process values(Processes.parent_process) as parent_process values(Processes.parent_process_id) as parent_process_id values(Processes.process_id) as process_id dc(Processes.parent_process_id) as parent_process_id_count dc(Processes.process_id) as process_id_count
+  min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes
+  where Processes.parent_process_name= "cmd.exe" (Processes.process_name = "notepad.exe" OR Processes.original_file_name= "notepad.exe") Processes.parent_process = "*.bat*"
+  by  Processes.parent_process_name Processes.process_name Processes.original_file_name Processes.parent_process Processes.dest Processes.user  _time 
+  span=30s | where parent_process_id_count>= 10 AND process_id_count >=10
+  | `drop_dm_object_name(Processes)` 
+  | `security_content_ctime(firstTime)` 
+  | `security_content_ctime(lastTime)` 
+  | `windows_command_shell_dcrat_forkbomb_payload_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. Tune and filter known instances of wermgr.exe may be used.
+known_false_positives: unknown
+references:
+- https://cert.gov.ua/article/405538
+- https://malpedia.caad.fkie.fraunhofer.de/details/win.dcrat
+- https://www.mandiant.com/resources/analyzing-dark-crystal-rat-backdoor
+tags:
+  analytic_story:
+  - DarkCrystal RAT
+  asset_type: Endpoint
+  cis20:
+  - CIS 3
+  - CIS 5
+  - CIS 16
+  confidence: 90
+  context:
+  - Source:Endpoint
+  - Stage:Execution
+  dataset:
+  - https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/dcrat/dcrat_forkbomb/sysmon.log
+  impact: 90
+  kill_chain_phases:
+  - Exploitation
+  message: Multiple cmd.exe processes with child process of notepad.exe executed on $dest$
+  mitre_attack_id:
+  - T1059.003
+  - T1059
+  nist:
+  - DE.CM
+  observable:
+  - name: dest
+    type: Hostname
+    role:
+    - Victim
+  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: 81
+  security_domain: endpoint

detections/endpoint/windows_gather_victim_network_info_through_ip_check_web_services.yml

@@ -26,6 +26,7 @@ references:
 tags:
   analytic_story:
   - Azorult
+  - DarkCrystal RAT
   asset_type: Endpoint
   cis20:
   - CIS 3

detections/endpoint/windows_high_file_deletion_frequency.yml

@@ -2,7 +2,7 @@ name: Windows High File Deletion Frequency
 id: 45b125c4-866f-11eb-a95a-acde48001122
 version: 1
 date: '2021-03-16'
-author: Teoderick Contreras
+author: Teoderick Contreras, Splunk
 type: Anomaly
 datamodel:
 - Endpoint
@@ -13,7 +13,7 @@ description: This search looks for high frequency of file deletion relative to p
 search: '`sysmon` EventCode=23 TargetFilename IN ("*.cmd", "*.ini","*.gif", "*.jpg",
   "*.jpeg", "*.db", "*.ps1", "*.doc*", "*.xls*", "*.ppt*", "*.bmp","*.zip", "*.rar",
   "*.7z", "*.chm", "*.png", "*.log", "*.vbs", "*.js", "*.vhd", "*.bak", "*.wbcat",
-  "*.bkf" , "*.backup*", "*.dsk", , "*.win") | stats values(TargetFilename) as deleted_files
+  "*.bkf" , "*.backup*", "*.dsk", "*.win") | stats values(TargetFilename) as deleted_files
   min(_time) as firstTime max(_time) as lastTime count by Computer user EventCode
   Image ProcessID |where count >=100 | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
   | `windows_high_file_deletion_frequency_filter`'
@@ -29,6 +29,7 @@ tags:
   analytic_story:
   - Clop Ransomware
   - WhisperGate
+  - DarkCrystal RAT
   confidence: 80
   context:
   - Source:Endpoint

detections/endpoint/windows_system_logoff_commandline.yml

@@ -0,0 +1,73 @@
+name: Windows System LogOff Commandline
+id: 74a8133f-93e7-4b71-9bd3-13a66124fd57
+version: 1
+date: '2022-07-27'
+author: Teoderick Contreras, Splunk
+type: Anomaly
+datamodel:
+- Endpoint
+description: The following analytic identifies Windows commandlined to logoff a windows host machine. 
+  This technique was seen in several APT, RAT like dcrat and other commodity malware to shutdown the machine to add more impact, 
+  interrupt access, aid destruction of the system like wiping disk or inhibit system recovery.
+  This TTP is a good pivot to check why application trigger this commandline which is not so common way to logoff a machine.
+search: '| tstats `security_content_summariesonly` values(Processes.process) as process min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes
+  where (Processes.process_name = shutdown.exe OR Processes.original_file_name = shutdown.exe) Processes.process="*shutdown*" Processes.process="* /l*" Processes.process="* /t*"
+  by Processes.dest Processes.user Processes.parent_process Processes.process_name Processes.original_file_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_logoff_commandline_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: Administrator may execute this commandline to trigger shutdown, logoff or restart the host machine.
+references:
+- https://attack.mitre.org/techniques/T1529/
+- https://www.mandiant.com/resources/analyzing-dark-crystal-rat-backdoor
+tags:
+  analytic_story:
+  - DarkCrystal RAT
+  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/malware/reboot_logoff_commandline/sysmon.log
+  impact: 70
+  kill_chain_phases:
+  - Exploitation
+  message: Process name $process_name$ is seen to execute logoff commandline on $dest$
+  mitre_attack_id:
+  - T1529
+  nist:
+  - DE.CM
+  observable:
+  - name: dest
+    type: Hostname
+    role:
+    - Victim
+  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: 56
+  security_domain: endpoint

detections/endpoint/windows_system_reboot_commandline.yml

@@ -0,0 +1,74 @@
+name: Windows System Reboot CommandLine
+id: 97fc2b60-c8eb-4711-93f7-d26fade3686f
+version: 1
+date: '2022-07-27'
+author: Teoderick Contreras, Splunk
+type: Anomaly
+datamodel:
+- Endpoint
+description: The following analytic identifies Windows commandlined to reboot a windows host machine. 
+  This technique was seen in several APT, RAT like dcrat and other commodity malware to shutdown the machine to add more impact, 
+  interrupt access, aid destruction of the system like wiping disk or inhibit system recovery.
+  This TTP is a good pivot to check why application trigger this commandline which is not so common way to reboot a machine.
+  Compare to shutdown and logoff shutdown.exe feature, reboot seen in some automation script like ansible to reboot the machine.
+search: '| tstats `security_content_summariesonly` values(Processes.process) as process min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes
+  where (Processes.process_name = shutdown.exe OR Processes.original_file_name = shutdown.exe) Processes.process="*shutdown*" Processes.process="* /r*" Processes.process="* /t*"
+  by Processes.dest Processes.user Processes.parent_process Processes.process_name Processes.original_file_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_reboot_commandline_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: Administrator may execute this commandline to trigger shutdown or restart the host machine.
+references:
+- https://attack.mitre.org/techniques/T1529/
+- https://www.mandiant.com/resources/analyzing-dark-crystal-rat-backdoor
+tags:
+  analytic_story:
+  - DarkCrystal RAT
+  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/malware/reboot_logoff_commandline/sysmon.log
+  impact: 60
+  kill_chain_phases:
+  - Exploitation
+  message: Process $process_name$ that executed reboot via commandline on $dest$
+  mitre_attack_id:
+  - T1529
+  nist:
+  - DE.CM
+  observable:
+  - name: dest
+    type: Hostname
+    role:
+    - Victim
+  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

detections/endpoint/windows_system_shutdown_commandline.yml

@@ -0,0 +1,73 @@
+name: Windows System Shutdown CommandLine
+id: 4fee57b8-d825-4bf3-9ea8-bf405cdb614c
+version: 1
+date: '2022-07-27'
+author: Teoderick Contreras, Splunk
+type: Anomaly
+datamodel:
+- Endpoint
+description: The following analytic identifies Windows commandlined to shutdown a windows host machine. 
+  This technique was seen in several APT, RAT like dcrat and other commodity malware to shutdown the machine to add more impact, 
+  interrupt access, aid destruction of the system like wiping disk or inhibit system recovery.
+  This TTP is a good pivot to check why application trigger this commandline which is not so common way to shutdown a machine.
+search: '| tstats `security_content_summariesonly` values(Processes.process) as process min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes
+  where (Processes.process_name = shutdown.exe OR Processes.original_file_name = shutdown.exe) Processes.process="*shutdown*" Processes.process="* /s*" Processes.process="* /t*"
+  by Processes.dest Processes.user Processes.parent_process Processes.process_name Processes.original_file_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_shutdown_commandline_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: Administrator may execute this commandline to trigger shutdown or restart the host machine.
+references:
+- https://attack.mitre.org/techniques/T1529/
+- https://www.mandiant.com/resources/analyzing-dark-crystal-rat-backdoor
+tags:
+  analytic_story:
+  - DarkCrystal RAT
+  asset_type: Endpoint
+  cis20:
+  - CIS 3
+  - CIS 5
+  - CIS 16
+  confidence: 70
+  context:
+  - Source:Endpoint
+  - Stage:Execution
+  dataset:
+  - https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/dcrat/shutdown_commandline/sysmon.log
+  impact: 70
+  kill_chain_phases:
+  - Exploitation
+  message: Process $process_name$ seen to execute shutdown via commandline on $dest$
+  mitre_attack_id:
+  - T1529
+  nist:
+  - DE.CM
+  observable:
+  - name: dest
+    type: Hostname
+    role:
+    - Victim
+  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: 49
+  security_domain: endpoint

detections/endpoint/windows_system_time_discovery_w32tm_delay.yml

@@ -0,0 +1,76 @@
+name: Windows System Time Discovery W32tm Delay
+id: b2cc69e7-11ba-42dc-a269-59c069a48870
+version: 1
+date: '2022-07-28'
+author: Teoderick Contreras, Splunk
+type: Anomaly
+datamodel:
+- Endpoint
+description:  The following analytic identifies DCRat delay time tactics using w32tm. 
+  This technique was seen in DCRAT malware where it uses stripchart function of w32tm.exe application to delay the execution of its payload like 
+  c2 communication , beaconing and execution. This anomaly detection may help the analyst to check other possible event like the process who 
+  execute this command that may lead to DCRat attack.
+search: '| tstats `security_content_summariesonly` values(Processes.process) as process min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes
+  where Processes.process_name = w32tm.exe Processes.process= "* /stripchart *" Processes.process= "* /computer:localhost *" 
+  Processes.process= "* /period:*" Processes.process= "* /dataonly *" Processes.process= "* /samples:*"
+  by  Processes.parent_process Processes.process_name Processes.original_file_name Processes.process 
+  Processes.process_id Processes.parent_process_id Processes.dest Processes.user
+  | `drop_dm_object_name(Processes)` 
+  | `security_content_ctime(firstTime)` 
+  | `security_content_ctime(lastTime)` 
+  | `windows_system_time_discovery_w32tm_delay_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. Tune and filter known instances of wermgr.exe may be used.
+known_false_positives: unknown
+references:
+- https://cert.gov.ua/article/405538
+- https://malpedia.caad.fkie.fraunhofer.de/details/win.dcrat
+- https://www.mandiant.com/resources/analyzing-dark-crystal-rat-backdoor
+tags:
+  analytic_story:
+  - DarkCrystal RAT
+  asset_type: Endpoint
+  cis20:
+  - CIS 3
+  - CIS 5
+  - CIS 16
+  confidence: 60
+  context:
+  - Source:Endpoint
+  - Stage:Execution
+  dataset:
+  - https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/dcrat/dcrat_delay_execution/sysmon.log
+  impact: 60
+  kill_chain_phases:
+  - Reconnaissance
+  message: Process name w32tm.exe is using suspcicious command line arguments $process$ on host $dest$. 
+  mitre_attack_id:
+  - T1124
+  nist:
+  - DE.CM
+  observable:
+  - name: dest
+    type: Hostname
+    role:
+    - Victim
+  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: 36
+  security_domain: endpoint

tests/endpoint/windows_command_shell_dcrat_forkbomb_payload.test.yml

@@ -0,0 +1,13 @@
+name: Windows Command Shell DCRat ForkBomb Payload Unit Test
+tests:
+- name: Windows Command Shell DCRat ForkBomb Payload
+  file: endpoint/windows_command_shell_dcrat_forkbomb_payload.yml
+  pass_condition: '| stats count | where count > 0'
+  earliest_time: -24h
+  latest_time: now
+  attack_data:
+  - file_name: sysmon.log
+    data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/dcrat/dcrat_forkbomb/sysmon.log
+    source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
+    sourcetype: xmlwineventlog
+    update_timestamp: true

tests/endpoint/windows_system_logoff_commandline.test.yml

@@ -0,0 +1,13 @@
+name: Windows System LogOff Commandline Unit Test
+tests:
+- name: Windows System LogOff Commandline
+  file: endpoint/windows_system_logoff_commandline.yml
+  pass_condition: '| stats count | where count > 0'
+  earliest_time: -24h
+  latest_time: now
+  attack_data:
+  - file_name: sysmon.log
+    data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/dcrat/reboot_logoff_commandline/sysmon.log
+    source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
+    sourcetype: xmlwineventlog
+    update_timestamp: true

tests/endpoint/windows_system_reboot_commandline.test.yml

@@ -0,0 +1,13 @@
+name: Windows System Reboot CommandLine Unit Test
+tests:
+- name: Windows System Reboot CommandLine
+  file: endpoint/windows_system_reboot_commandline.yml
+  pass_condition: '| stats count | where count > 0'
+  earliest_time: -24h
+  latest_time: now
+  attack_data:
+  - file_name: sysmon.log
+    data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/dcrat/reboot_logoff_commandline/sysmon.log
+    source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
+    sourcetype: xmlwineventlog
+    update_timestamp: true

tests/endpoint/windows_system_shutdown_commandline.test.yml

@@ -0,0 +1,13 @@
+name: Windows System Shutdown CommandLine Unit Test
+tests:
+- name: Windows System Shutdown CommandLine
+  file: endpoint/windows_system_shutdown_commandline.yml
+  pass_condition: '| stats count | where count > 0'
+  earliest_time: -24h
+  latest_time: now
+  attack_data:
+  - file_name: sysmon.log
+    data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/dcrat/shutdown_commandline/sysmon.log
+    source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
+    sourcetype: xmlwineventlog
+    update_timestamp: true

tests/endpoint/windows_system_time_discovery_w32tm_delay.test.yml

@@ -0,0 +1,13 @@
+name: Windows System Time Discovery W32tm Delay Unit Test
+tests:
+- name: Windows System Time Discovery W32tm Delay
+  file: endpoint/windows_system_time_discovery_w32tm_delay.yml
+  pass_condition: '| stats count | where count > 0'
+  earliest_time: -24h
+  latest_time: now
+  attack_data:
+  - file_name: sysmon.log
+    data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/dcrat/dcrat_delay_execution/sysmon.log
+    source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
+    sourcetype: xmlwineventlog
+    update_timestamp: true