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76 lines
2.7 KiB
YAML
76 lines
2.7 KiB
YAML
name: Suspicious MSBuild Spawn
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id: a115fba6-5514-11eb-ae93-0242ac130002
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version: 1
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date: '2021-01-12'
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author: Michael Haag, Splunk
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type: batch
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datamodel:
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- Endpoint
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description: The following analytic identifies wmiprvse.exe spawning msbuild.exe.
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This behavior is indicative of a COM object being utilized to spawn msbuild from
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wmiprvse.exe. It is common for MSBuild.exe to be spawned from devenv.exe while using
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Visual Studio. In this instance, there will be command line arguments and file paths.
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In a malicious instance, MSBuild.exe will spawn from non-standard processes and
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have no command line arguments. For example, MSBuild.exe spawning from explorer.exe,
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powershell.exe is far less common and should be investigated.
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search: '| tstats `security_content_summariesonly` count values(Processes.process_name)
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as process_name values(Processes.process) as process min(_time) as firstTime max(_time)
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as lastTime from datamodel=Endpoint.Processes where Processes.parent_process_name=wmiprvse.exe
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AND Processes.process_name=msbuild.exe by Processes.dest Processes.parent_process
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Processes.user | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `suspicious_msbuild_spawn_filter`'
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how_to_implement: To successfully implement this search you need to be ingesting information
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on process that include the name of the process responsible for the changes from
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your endpoints into the `Endpoint` datamodel in the `Processes` node.
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known_false_positives: Although unlikely, some legitimate applications may exhibit
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this behavior, triggering a false positive.
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references:
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- https://lolbas-project.github.io/lolbas/Binaries/Msbuild/
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- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1127.001/T1127.001.md
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tags:
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analytic_story:
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- Trusted Developer Utilities Proxy Execution MSBuild
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asset_type: Endpoint
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automated_detection_testing: passed
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cis20:
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- CIS 8
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confidence: 60
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context:
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- Source:Endpoint
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- Stage:Defense Evasion
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- Stage:Execution
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1127.001/windows-sysmon.log
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impact: 70
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kill_chain_phases:
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- Exploitation
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message: Suspicious msbuild.exe process executed on $dest$ by $user$
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mitre_attack_id:
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- T1127.001
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nist:
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- PR.PT
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- DE.CM
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observable:
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- name: dest
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type: Endpoint
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role:
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- Victim
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- name: User
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type: User
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role:
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- Victim
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product:
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- Splunk Enterprise
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- Splunk Enterprise Security
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- Splunk Cloud
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required_fields:
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- _time
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- Processes.process_name
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- Processes.process
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- Processes.parent_process_name
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- Processes.dest
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- Processes.parent_process
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- Processes.user
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risk_score: 42
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security_domain: endpoint
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