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P4T12ICK
67 lines
2.5 KiB
YAML
67 lines
2.5 KiB
YAML
name: Suspicious microsoft workflow compiler rename
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id: f0db4464-55d9-11eb-ae93-0242ac130002
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version: 4
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date: '2022-04-07'
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author: Michael Haag, Splunk
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status: production
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type: Hunting
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description: The following analytic identifies a renamed instance of microsoft.workflow.compiler.exe.
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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. A spawned child process from microsoft.workflow.compiler.exe is uncommon.
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In any instance, microsoft.workflow.compiler.exe spawning from an Office product
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or any living off the land binary is highly suspect.
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data_source:
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- Sysmon Event ID 1
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search:
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selection1:
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OriginalFileName: Microsoft.Workflow.Compiler.exe
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Image|endswith: microsoft.workflow.compiler.exe
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condition: selection1
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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, some legitimate applications may use a moved
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copy of microsoft.workflow.compiler.exe, triggering a false positive.
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references:
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- https://lolbas-project.github.io/lolbas/Binaries/Microsoft.Workflow.Compiler/
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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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- Cobalt Strike
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- Masquerading - Rename System Utilities
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- Living Off The Land
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asset_type: Endpoint
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confidence: 90
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impact: 70
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message: Suspicious renamed microsoft.workflow.compiler.exe binary ran on $dest$
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by $user$
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mitre_attack_id:
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- T1036
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- T1127
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- T1036.003
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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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risk_score: 63
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security_domain: endpoint
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tests:
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- name: True Positive Test
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attack_data:
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- data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1127/atomic_red_team/windows-sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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