mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
research-bot
90 lines
4.5 KiB
YAML
90 lines
4.5 KiB
YAML
name: Windows System Script Proxy Execution Syncappvpublishingserver
|
|
id: 8dd73f89-682d-444c-8b41-8e679966ad3c
|
|
version: 6
|
|
date: '2024-11-13'
|
|
author: Michael Haag, Splunk
|
|
status: production
|
|
type: TTP
|
|
description: The following analytic detects the execution of Syncappvpublishingserver.vbs
|
|
via wscript.exe or cscript.exe, which may indicate an attempt to download remote
|
|
files or perform privilege escalation. This detection leverages data from Endpoint
|
|
Detection and Response (EDR) agents, focusing on process names and command-line
|
|
executions. Monitoring this activity is crucial as it can signify malicious use
|
|
of a native Windows script for unauthorized actions. If confirmed malicious, this
|
|
behavior could lead to unauthorized file downloads or elevated privileges, posing
|
|
a significant security risk.
|
|
data_source:
|
|
- Sysmon EventID 1
|
|
- Windows Event Log Security 4688
|
|
- CrowdStrike ProcessRollup2
|
|
search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
|
|
as lastTime from datamodel=Endpoint.Processes where Processes.process_name IN ("wscript.exe","cscript.exe")
|
|
Processes.process="*syncappvpublishingserver.vbs*" by Processes.dest Processes.user
|
|
Processes.parent_process_name Processes.process_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_script_proxy_execution_syncappvpublishingserver_filter`'
|
|
how_to_implement: The detection is based on data that originates from Endpoint Detection
|
|
and Response (EDR) agents. These agents are designed to provide security-related
|
|
telemetry from the endpoints where the agent is installed. To implement this search,
|
|
you must ingest logs that contain the process GUID, process name, and parent process.
|
|
Additionally, you must ingest complete command-line executions. These logs must
|
|
be processed using the appropriate Splunk Technology Add-ons that are specific to
|
|
the EDR product. The logs must also be mapped to the `Processes` node of the `Endpoint`
|
|
data model. Use the Splunk Common Information Model (CIM) to normalize the field
|
|
names and speed up the data modeling process.
|
|
known_false_positives: False positives may be present if the vbscript syncappvpublishingserver
|
|
is used for legitimate purposes. Filter as needed. Adding a n; to the command-line
|
|
arguments may help reduce any noise.
|
|
references:
|
|
- https://lolbas-project.github.io/lolbas/Scripts/Syncappvpublishingserver/
|
|
- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1216/T1216.md#atomic-test-1---syncappvpublishingserver-signed-script-powershell-command-execution
|
|
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 ("$user$",
|
|
"$dest$") 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: $info_max_time$
|
|
rba:
|
|
message: An instance of $parent_process_name$ spawning $process_name$ was identified
|
|
on endpoint $dest$ by user $user$ attempting to download files or evade critical
|
|
controls.
|
|
risk_objects:
|
|
- field: user
|
|
type: user
|
|
score: 30
|
|
- field: dest
|
|
type: system
|
|
score: 30
|
|
threat_objects:
|
|
- field: parent_process_name
|
|
type: parent_process_name
|
|
- field: process_name
|
|
type: process_name
|
|
tags:
|
|
analytic_story:
|
|
- Living Off The Land
|
|
asset_type: Endpoint
|
|
mitre_attack_id:
|
|
- T1216
|
|
- T1218
|
|
product:
|
|
- Splunk Enterprise
|
|
- Splunk Enterprise Security
|
|
- Splunk Cloud
|
|
security_domain: endpoint
|
|
tests:
|
|
- name: True Positive Test
|
|
attack_data:
|
|
- data:
|
|
https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1216/atomic_red_team/windows-sysmon.log
|
|
source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
|
|
sourcetype: XmlWinEventLog
|