mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
Steven Dick
97 lines
4.7 KiB
YAML
97 lines
4.7 KiB
YAML
name: Detect Remote Access Software Usage URL
|
|
id: 9296f515-073c-43a5-88ec-eda5a4626654
|
|
version: 7
|
|
date: '2024-11-15'
|
|
author: Steven Dick
|
|
status: production
|
|
type: Anomaly
|
|
description: The following analytic detects the execution of known remote access software
|
|
within the environment. It leverages network logs mapped to the Web data model,
|
|
identifying specific URLs and user agents associated with remote access tools like
|
|
AnyDesk, GoToMyPC, LogMeIn, and TeamViewer. This activity is significant as adversaries
|
|
often use these utilities to maintain unauthorized remote access. If confirmed malicious,
|
|
this could allow attackers to control systems remotely, exfiltrate data, or further
|
|
compromise the network, posing a severe security risk.
|
|
data_source:
|
|
- Palo Alto Network Threat
|
|
search: '| tstats count min(_time) as firstTime max(_time) as lastTime latest(Web.http_method)
|
|
as http_method latest(Web.http_user_agent) as http_user_agent latest(Web.url) as
|
|
url latest(Web.user) as user latest(Web.dest) as dest from datamodel=Web by Web.action
|
|
Web.src Web.category Web.url_domain | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
|
|
| `drop_dm_object_name("Web")` | lookup remote_access_software remote_domain AS
|
|
url_domain OUTPUT isutility, description as signature, comment_reference as desc,
|
|
category | search isutility = True | `remote_access_software_usage_exceptions` |
|
|
`detect_remote_access_software_usage_url_filter`'
|
|
how_to_implement: The detection is based on data that originates from network logs.
|
|
These logs must be processed using the appropriate Splunk Technology Add-ons that
|
|
are specific to the network logs. The logs must also be mapped to the `Web` data
|
|
model. Use the Splunk Common Information Model (CIM) to normalize the field names
|
|
and speed up the data modeling process. The "exceptions" macro leverages both an
|
|
Assets and Identities lookup, as well as a KVStore collection called "remote_software_exceptions"
|
|
that lets you track and maintain device- based exceptions for this set of detections.
|
|
known_false_positives: It is possible that legitimate remote access software is used
|
|
within the environment. Ensure that the lookup is reviewed and updated with any
|
|
additional remote access software that is used within the environment. Known false
|
|
positives can be added to the remote_access_software_usage_exception.csv lookup
|
|
to globally suppress these situations across all remote access content
|
|
references:
|
|
- https://attack.mitre.org/techniques/T1219/
|
|
- https://thedfirreport.com/2022/08/08/bumblebee-roasts-its-way-to-domain-admin/
|
|
- https://thedfirreport.com/2022/11/28/emotet-strikes-again-lnk-file-leads-to-domain-wide-ransomware/
|
|
drilldown_searches:
|
|
- name: View the detection results for - "$src$" and "$user$"
|
|
search: '%original_detection_search% | search src = "$src$" user = "$user$"'
|
|
earliest_offset: $info_min_time$
|
|
latest_offset: $info_max_time$
|
|
- name: View risk events for the last 7 days for - "$src$" and "$user$"
|
|
search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$src$",
|
|
"$user$") starthoursago=168 | 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: $info_min_time$
|
|
latest_offset: $info_max_time$
|
|
- name: Investigate traffic to $url_domain$
|
|
search: '| from datamodel:Web | search src=$src$ url_domain=$url_domain$'
|
|
earliest_offset: $info_min_time$
|
|
latest_offset: $info_max_time$
|
|
rba:
|
|
message: A domain for a known remote access software $url_domain$ was contacted
|
|
by $src$.
|
|
risk_objects:
|
|
- field: src
|
|
type: system
|
|
score: 25
|
|
- field: user
|
|
type: user
|
|
score: 25
|
|
threat_objects:
|
|
- field: url_domain
|
|
type: domain
|
|
- field: signature
|
|
type: signature
|
|
tags:
|
|
analytic_story:
|
|
- Insider Threat
|
|
- Command And Control
|
|
- Ransomware
|
|
- CISA AA24-241A
|
|
- Remote Monitoring and Management Software
|
|
asset_type: Network
|
|
mitre_attack_id:
|
|
- T1219
|
|
product:
|
|
- Splunk Enterprise
|
|
- Splunk Enterprise Security
|
|
- Splunk Cloud
|
|
security_domain: network
|
|
manual_test: This detection uses A&I lookups from Enterprise Security.
|
|
tests:
|
|
- name: True Positive Test
|
|
attack_data:
|
|
- data:
|
|
https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1219/screenconnect/screenconnect_palo.log
|
|
source: screenconnect_palo
|
|
sourcetype: pan:threat
|