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mhaag-spl
80 lines
2.8 KiB
YAML
80 lines
2.8 KiB
YAML
name: Suspicious microsoft workflow compiler usage
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id: 9bbc62e8-55d8-11eb-ae93-0242ac130002
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version: 2
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date: '2021-01-12'
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author: Michael Haag, Splunk
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type: TTP
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datamodel:
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- Endpoint
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description: The following analytic identifies microsoft.workflow.compiler.exe usage.
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microsoft.workflow.compiler.exe is natively found in C:\Windows\Microsoft.NET\Framework64\v4.0.30319
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and is rarely utilized. When investigating, identify the executed code on disk and
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review. It is not a commonly used process by many applications.
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search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
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as lastTime from datamodel=Endpoint.Processes where `process_microsoftworkflowcompiler`
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by Processes.dest Processes.parent_process Processes.process_name Processes.original_file_name
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Processes.process Processes.user | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `suspicious_microsoft_workflow_compiler_usage_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. In addition,
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confirm the latest CIM App 4.20 or higher is installed and the latest TA for the
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endpoint product.
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known_false_positives: Although unlikely, limited instances have been identified coming
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from native Microsoft utilities similar to SCCM.
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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/T1218/T1218.md#atomic-test-6---microsoftworkflowcompilerexe-payload-execution
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tags:
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analytic_story:
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- Trusted Developer Utilities Proxy Execution
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- Living Off The Land
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asset_type: Endpoint
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cis20:
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- CIS 8
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confidence: 50
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context:
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- Source:Endpoint
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- Stage:Defense Evasion
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1127/atomic_red_team/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 microsoft.workflow.compiler.exe process ran on $dest$ by $user$
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mitre_attack_id:
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- T1127
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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.dest
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- Processes.user
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- Processes.parent_process_name
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- Processes.parent_process
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- Processes.original_file_name
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- Processes.process_name
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- Processes.process
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- Processes.process_id
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- Processes.parent_process_path
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- Processes.process_path
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- Processes.parent_process_id
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risk_score: 35
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security_domain: endpoint
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supported_tas:
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- Splunk_TA_microsoft_sysmon
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