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detections/endpoint/windows_common_abused_cmd_shell_risk_behavior.yml

@@ -0,0 +1,83 @@
+name: Windows Common Abused Cmd Shell Risk Behavior
+id: e99fcc4f-c6b0-4443-aa2a-e3c85126ec9a
+version: 1
+date: '2023-06-14'
+author: Teoderick Contreras, Splunk
+status: production
+type: Correlation
+data_source: []
+description: The following correlation identifies instances where four or more distinct detection analytics are associated with malicious command line behavior that is known to be exploited by multiple threat actors, adversaries, or red teamers on a specific host. By leveraging the Command Line Interface (CLI), attackers can execute malicious commands, gain access to sensitive data, install backdoors, and engage in various nefarious activities. The impact of such compromise can be severe, as attackers may gain unauthorized control over the compromised system, enabling them to exfiltrate valuable information, escalate privileges, or launch further attacks within the network. If this detection is triggered, there is a high level of confidence in the occurrence of suspicious command line activities on the host.
+search: '| tstats `security_content_summariesonly` min(_time) as firstTime max(_time) as lastTime 
+  sum(All_Risk.calculated_risk_score) as risk_score, 
+  count(All_Risk.calculated_risk_score) as risk_event_count, 
+  values(All_Risk.annotations.mitre_attack.mitre_tactic_id) as annotations.mitre_attack.mitre_tactic_id,
+  dc(All_Risk.annotations.mitre_attack.mitre_tactic_id) as mitre_tactic_id_count, 
+  values(All_Risk.annotations.mitre_attack.mitre_technique_id) as annotations.mitre_attack.mitre_technique_id, 
+  dc(All_Risk.annotations.mitre_attack.mitre_technique_id) as mitre_technique_id_count, 
+  values(All_Risk.tag) as tag, values(source) as source, 
+  dc(source) as source_count from datamodel=Risk.All_Risk 
+  where source IN ("*Cmdline Tool Not Executed In CMD Shell*", "*Windows System Network Config Discovery Display DNS*", "*Local Account Discovery With Wmic*", "*Net Localgroup Discovery*", "*Create local admin accounts using net exe*", 
+  "*Local Account Discovery with Net*", "*Icacls Deny Command*", "*ICACLS Grant Command*", "*Windows Proxy Via Netsh*", "*Processes launching netsh*", "*Disabling Firewall with Netsh*", "*Windows System Network Connections Discovery Netsh*", 
+  "*Network Connection Discovery With Arp*", "*Windows System Discovery Using ldap Nslookup*", "*Windows System Shutdown CommandLine*") 
+  by All_Risk.risk_object All_Risk.risk_object_type All_Risk.annotations.mitre_attack.mitre_tactic 
+  | `drop_dm_object_name(All_Risk)` 
+  | `security_content_ctime(firstTime)` 
+  | `security_content_ctime(lastTime)` 
+  | where source_count >= 4 
+  | `windows_common_abused_cmd_shell_risk_behavior_filter`'
+how_to_implement: Splunk Enterprise Security is required to utilize this correlation. In addition, 
+  modify the source_count value to your environment. In our testing, a count of 4 or 5 was decent in a lab, 
+  but the number may need to be increased base on internal testing. In addition, 
+  based on false positives, modify any analytics to be anomaly and lower or increase risk based on organization importance.
+known_false_positives: False positives will be present based on many factors. Tune
+  the correlation as needed to reduce too many triggers.
+references:
+- https://www.splunk.com/en_us/blog/security/from-macros-to-no-macros-continuous-malware-improvements-by-qakbot.html
+- https://www.splunk.com/en_us/blog/security/dark-crystal-rat-agent-deep-dive.html
+tags:
+  analytic_story:
+  - Netsh Abuse
+  - Disabling Security Tools
+  - Windows Post-Exploitation
+  - Qakbot
+  - Azorult
+  - Sandworm Tools
+  - Volt Typhoon
+  - FIN7
+  - DarkCrystal RAT
+  - Windows Defense Evasion Tactics
+  asset_type: Endpoint
+  confidence: 70
+  impact: 70
+  message: series of process commandline being abused by threat actor have been identified on $risk_object$
+  mitre_attack_id:
+  - T1222
+  - T1049
+  - T1033
+  - T1529 
+  - T1016
+  - T1059
+  observable:
+  - name: risk_object
+    type: Hostname
+    role:
+    - Victim
+  product:
+  - Splunk Enterprise
+  - Splunk Enterprise Security
+  - Splunk Cloud
+  risk_score: 49
+  required_fields:
+  - _time
+  - All_Risk.analyticstories
+  - All_Risk.risk_object_type
+  - All_Risk.risk_object
+  - All_Risk.annotations.mitre_attack.mitre_tactic
+  - source
+  security_domain: endpoint
+tests:
+- name: True Positive Test
+  attack_data:
+  - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1059/risk_behavior/abused_commandline/risk_recon.log
+    source: risk
+    sourcetype: stash

detections/endpoint/windows_system_discovery_using_ldap_nslookup.yml

@@ -4,7 +4,7 @@ version: 1
 date: '2022-10-21'
 author: Teoderick Contreras, Splunk
 status: production
-type: Hunting
+type: Anomaly
 description: The following analytic identifies the execution of nslookup.exe tool
   to get domain information. Nslookup.exe is a command-line tool that can display
   information to diagnose domain name systems. This Nslookup feature is being abused
@@ -33,8 +33,8 @@ tags:
   analytic_story:
   - Qakbot
   asset_type: Endpoint
-  confidence: 50
-  impact: 50
+  confidence: 10
+  impact: 10
   message: System nslookup domain discovery on $dest$
   mitre_attack_id:
   - T1033
@@ -60,7 +60,7 @@ tags:
   - Processes.parent_process_path
   - Processes.process_path
   - Processes.parent_process_id
-  risk_score: 25
+  risk_score: 1
   security_domain: endpoint
 tests:
 - name: True Positive Test

detections/endpoint/windows_system_network_config_discovery_display_dns.yml

@@ -4,7 +4,7 @@ version: 1
 date: '2022-11-30'
 author: Teoderick Contreras, Splunk
 status: production
-type: Hunting
+type: Anomaly
 description: The following analytic identifies a process command line that retrieves
   dns reply information using Windows OS built-in tool IPConfig. This technique is
   being abused by threat actors, adversaries and post exploitation tools like WINPEAS

detections/endpoint/windows_system_network_connections_discovery_netsh.yml

@@ -4,7 +4,7 @@ version: 1
 date: '2022-11-30'
 author: Teoderick Contreras, Splunk
 status: production
-type: Hunting
+type: Anomaly
 description: The following analytic identifies a process execution of Windows OS built-in
   tool netsh.exe to show state, configuration and profile of host firewall. This tool
   is being used or abused by several adversaries or even post exploitation tool to