mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
research bot
80 lines
2.9 KiB
YAML
80 lines
2.9 KiB
YAML
name: Suspicious msbuild path
|
|
id: f5198224-551c-11eb-ae93-0242ac130002
|
|
version: 1
|
|
date: '2021-01-12'
|
|
author: Michael Haag, Splunk
|
|
type: batch
|
|
datamodel:
|
|
- Endpoint
|
|
description: The following analytic identifies msbuild.exe executing from a non-standard
|
|
path. Msbuild.exe is natively found in C:\Windows\Microsoft.NET\Framework\v4.0.30319
|
|
and C:\Windows\Microsoft.NET\Framework64\v4.0.30319. Instances of Visual Studio
|
|
will run a copy of msbuild.exe. A moved instance of MSBuild is suspicious, however
|
|
there are instances of build applications that will move or use a copy of MSBuild.
|
|
search: '| tstats `security_content_summariesonly` count values(Processes.process_name)
|
|
as process_name values(Processes.process) as process min(_time) as firstTime max(_time)
|
|
as lastTime from datamodel=Endpoint.Processes where Processes.process_name=msbuild.exe
|
|
AND (Processes.process_path!=c:\\windows\\microsoft.net\\framework*\\v*\\*) by Processes.dest
|
|
Processes.parent_process Processes.user | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)`
|
|
| `security_content_ctime(lastTime)`| `suspicious_msbuild_path_filter`'
|
|
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
|
|
your endpoints into the `Endpoint` datamodel in the `Processes` node.
|
|
known_false_positives: Some legitimate applications may use a moved copy of msbuild.exe,
|
|
triggering a false positive. Baselining of MSBuild.exe usage is recommended to better
|
|
understand it's path usage. Visual Studio runs an instance out of a path that will
|
|
need to be filtered on.
|
|
references:
|
|
- https://lolbas-project.github.io/lolbas/Binaries/Msbuild/
|
|
- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1127.001/T1127.001.md
|
|
tags:
|
|
analytic_story:
|
|
- Trusted Developer Utilities Proxy Execution MSBuild
|
|
- Cobalt Strike
|
|
- Masquerading - Rename System Utilities
|
|
asset_type: Endpoint
|
|
automated_detection_testing: passed
|
|
cis20:
|
|
- CIS 8
|
|
confidence: 70
|
|
context:
|
|
- Source:Endpoint
|
|
- Stage:Defense Evasion
|
|
- Stage:Execution
|
|
- Stage:Defense Evasion
|
|
dataset:
|
|
- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1127.001/windows-sysmon.log
|
|
impact: 70
|
|
kill_chain_phases:
|
|
- Exploitation
|
|
message: Msbuild.exe ran from an uncommon path on $dest$ execyted by $user$
|
|
mitre_attack_id:
|
|
- T1127.001
|
|
- T1036.003
|
|
nist:
|
|
- PR.PT
|
|
- DE.CM
|
|
observable:
|
|
- name: dest
|
|
type: Endpoint
|
|
role:
|
|
- Victim
|
|
- name: User
|
|
type: User
|
|
role:
|
|
- Victim
|
|
product:
|
|
- Splunk Enterprise
|
|
- Splunk Enterprise Security
|
|
- Splunk Cloud
|
|
required_fields:
|
|
- _time
|
|
- Processes.process_name
|
|
- Processes.process
|
|
- Processes.process_path
|
|
- Processes.dest
|
|
- Processes.parent_process
|
|
- Processes.user
|
|
risk_score: 49
|
|
security_domain: endpoint
|