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Added detection testing service results inSuspicious Rundll32 dllregisterserver

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2021-02-09 19:37:50 +00:00
parent 157d8770e6
commit d53f30cff7
1 changed files with 12 additions and 11 deletions
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detections/endpoint/suspicious_rundll32_dllregisterserver.yml
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@@ -4,9 +4,10 @@ version: 1
date: '2021-02-09'
description: The following analytic identifies rundll32.exe using dllregisterserver
on the command line to load a DLL. When a DLL is registered, the DllRegisterServer
method entry point in the DLL is invoked. This is typically seen when a DLL is
being registered on the system. Not every instance is considered malicious, but it will capture malicious use of it.
During investigation, review the parent process and parrellel processes executing. Capture the DLL being loaded and inspect further.
method entry point in the DLL is invoked. This is typically seen when a DLL is being
registered on the system. Not every instance is considered malicious, but it will
capture malicious use of it. During investigation, review the parent process and
parrellel processes executing. Capture the DLL being loaded and inspect further.
Rundll32.exe is natively found in C:\Windows\system32 and C:\Windows\syswow64.
how_to_implement: To successfully implement this search you need to be ingesting information
on process that include the name of the process responsible for the changes from
@@ -23,14 +24,13 @@ references:
author: Michael Haag, Splunk
search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
as lastTime from datamodel=Endpoint.Processes where Processes.process_name=rundll32.exe
Processes.process=*dllregisterserver* by Processes.dest Processes.user Processes.parent_process 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)`
Processes.process=*dllregisterserver* by Processes.dest Processes.user Processes.parent_process
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)`
| `suspicious_rundll32_dllregisterserver_filter`'
known_false_positives: This is likely to produce false positives and will require some filtering.
Tune the query by adding command line paths to known good DLLs, or filtering based on parent process names.
known_false_positives: This is likely to produce false positives and will require
some filtering. Tune the query by adding command line paths to known good DLLs,
or filtering based on parent process names.
tags:
analytics_story:
- Suspicious Rundll32 Activity
@@ -46,4 +46,5 @@ tags:
security_domain: endpoint
asset_type: Endpoint
dataset:
- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1218.011/windows-sysmon.log
- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1218.011/atomic_red_team/windows-sysmon.log
automated_detection_testing: passed