Windows LOLBAS Executed Outside Expected Path

Name:Windows LOLBAS Executed Outside Expected Path
id:326fdf44-b90c-4d2e-adca-1fd140b10536
version:10
date:None
author:Steven Dick
status:production
type:Anomaly
Description:The following analytic identifies a LOLBAS process being executed outside of it's expected location. Processes being executed outside of expected locations may be an indicator that an adversary is attempting to evade defenses or execute malicious code. The LOLBAS project documents Windows native binaries that can be abused by threat actors to perform tasks like executing malicious code.
Data_source:

• -Sysmon EventID 1
• -Windows Event Log Security 4688

search:| tstats `security_content_summariesonly`
count min(_time) as firstTime
max(_time) as lastTime
FROM datamodel=Endpoint.Processes where

NOT Processes.process_path IN (
"*\\PROGRA~*",
"*\\Program Files \(x86\)\\",
"*\\Program Files\\",
"*:\\Windows\\System32\\*",
"*:\\Windows\\SysWOW64\\*",
"*:\\Windows\\WinSxS\\*"
)

by Processes.action Processes.dest Processes.original_file_name Processes.parent_process
Processes.parent_process_exec Processes.parent_process_guid Processes.parent_process_id
Processes.parent_process_name Processes.parent_process_path Processes.process
Processes.process_exec Processes.process_guid Processes.process_hash
Processes.process_id Processes.process_integrity_level Processes.process_name
Processes.process_path Processes.user Processes.user_id Processes.vendor_product

|`drop_dm_object_name(Processes)`
| lookup lolbas_file_path lolbas_file_name as process_name OUTPUT description as desc
| lookup lolbas_file_path lolbas_file_name as process_name lolbas_file_path as process_path OUTPUT description as is_lolbas_path
| search desc!="false" AND is_lolbas_path="false"
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`
| `windows_lolbas_executed_outside_expected_path_filter`


how_to_implement:To implement this search, you must ingest logs that contain the process name and process path, such as with Sysmon EID 1.
known_false_positives:Vendors, third party software or update processes may use versions of the binaries listed in the lookup table from non-standard paths. It is recommended to tune this analytic to exclude any known legitimate software or paths in your environment
References:
  -https://attack.mitre.org/techniques/T1036/
  -https://attack.mitre.org/techniques/T1036/005/
drilldown_searches:
 name:'View the detection results for - "$user$" and "$dest$"'
 search:'%original_detection_search% | search user = "$user$" dest = "$dest$"'
 earliest_offset:'$info_min_time$'
 latest_offset:'$info_max_time$'
 name:'View risk events for the last 7 days for - "$user$" and "$dest$"'
 search:'| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$user$", "$dest$") | stats count min(_time) as firstTime max(_time) as lastTime values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories) as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic) as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`'
 earliest_offset:'7d'
 latest_offset:'0'
analytic_story:['Living Off The Land', 'Masquerading - Rename System Utilities', 'Windows Defense Evasion Tactics']

asset_type:Endpoint

mitre_attack_id:['T1036.005', 'T1218.011']

product:['Splunk Enterprise', 'Splunk Enterprise Security', 'Splunk Cloud']

category:endpoint

security_domain:endpoint

tags:

tests:
 name:'True Positive Test'
 attack_data:
  data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1036/cmd_lolbas_usage/cmd_lolbas_usage.log
  source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
  sourcetype: XmlWinEventLog
 test_type:'unit'
manual_test:None